[ { "id": "https://authors.library.caltech.edu/records/w45qe-ee975", "eprint_id": 120466, "eprint_status": "archive", "datestamp": "2023-08-20 09:02:54", "lastmod": "2023-10-23 15:13:28", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Reddy-Narravula-Harshavardhan", "name": { "family": "Reddy", "given": "Narravula Harshavardhan" }, "orcid": "0000-0003-3897-8162" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Dynamics of the Caltech SSPP deployable structures: structure\u2013mechanism interaction and deployment envelope", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Narravula Harshavardhan Reddy, and Sergio Pellegrino. \n\nThis research was funded by the Space Solar Power Project at Caltech.\n\nThe authors thank Dr. Terry Gdoutos and Alan Truong for their help with CAD modeling and building the test structure;\nNoel Esparza-Duan, Michael O'Connell, Dr. Guanya Shi, Uba K. Ubamanayu, and George Popov for their help with\nmotion capture experiments; and Dr. Antonio Pedivellano for advice on simulation models.\n\n
Accepted Version - 2023_Harsha-paper_SMALL.pdf
", "abstract": "The Caltech Space Solar Power Project has been developing ultralight deployable space structures consisting of thin-shell composite strips that support photovoltaic and RF elements. These modular, square structures can potentially be scaled to tens of meters in size. This paper studies the interaction between the deployment dynamics of the structure and the deployment mechanism, both experimentally and numerically. Instead of considering a full structure, a quadrant is considered to reduce the number of components and to better focus on the main parameters that affect the deployment behavior. Outcomes of this research will not only benefit the Caltech project but will also contribute to the design of future lightweight deployable space structures that undergo unconstrained dynamic deployment.", "date": "2023-01-23", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "id_number": "CaltechAUTHORS:20230327-902809000.10", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902809000.10", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2023-2065", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2023-2065", "primary_object": { "basename": "2023_Harsha-paper_SMALL.pdf", "url": "https://authors.library.caltech.edu/records/w45qe-ee975/files/2023_Harsha-paper_SMALL.pdf" }, "resource_type": "book_section", "pub_year": "2023", "author_list": "Reddy, Narravula Harshavardhan and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/xhc8c-3ed19", "eprint_id": 120473, "eprint_status": "archive", "datestamp": "2023-08-20 08:58:14", "lastmod": "2023-10-23 15:31:07", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Luo-Wen", "name": { "family": "Luo", "given": "Wen" }, "orcid": "0000-0002-7551-5629" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Buckling Analysis of a Ladder Deployable Structure Supporting a Prestressed Film", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by the American Institute of Aeronautics and Astronautics, Inc.", "abstract": "Controlling the deflection and distortion of lightweight space structures is crucial for their function in space. In this paper, we consider the distortion of a ladder structure when being connected to a film using prestressed kirigami springs. The ladder structure is made with longitudinal CFRP Triangular Rollable and Collapsible (TRAC) booms braced by battens in the transverse direction due to prestress. This paper shows that the distortion is the result of the global buckling of the ladder structure. Then, the design space of the ladder structure has been explored to study the effects of design variables on the magnitude of shape distortion.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-0366", "id_number": "CaltechAUTHORS:20230327-902885000.22", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902885000.22", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2023-0366", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2023-0366", "resource_type": "book_section", "pub_year": "2023", "author_list": "Luo, Wen and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/qahtr-awd39", "eprint_id": 120465, "eprint_status": "archive", "datestamp": "2023-08-20 08:57:48", "lastmod": "2023-10-23 15:30:40", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wen-Alexander", "name": { "family": "Wen", "given": "Alexander" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Launch Vibration Damping Using Slip in Pretensioned Coils", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Alexander Wen, Sergio Pellegrino. \n\nThe authors acknowledge financial support from the Space Solar Power Project at Caltech.\n\nAccepted Version - 2023_Launch_Vibration_Damping_Scitech.pdf
", "abstract": "Vibration management is important for the survivability of structures during launch, and is particularly challenging for large deployable space structures. Adding damping to a structure reduces the overall level of response excitation, which increases survivability. Structural damping occurs through the dissipation of energy during vibration. One such energy dissipation mechanism that can be utilized to increase damping is friction, such as the friction between slipping layers of a wound roll. In this paper, we study the vibration response of a structure, which has a pre-tensioned coil wound around it. Here, the damping is provided by friction between slipping layers in the pre-tensioned coil. An experiment is performed on a small-scale setup to evaluate the feasibility of this approach by measuring the frequency response and damping under different winding tensions. The same setup is used to measure layer slip during vibration, using a high speed camera and tracking targets to identify the regions with the largest slip, indicating higher contribution to energy dissipation. To confirm understanding of the damping mechanism, a 3D finite-element simulation is created in an attempt to capture the variation in frequency response and locations of slip with winding tension measured experimentally.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-2066", "id_number": "CaltechAUTHORS:20230327-902798000.8", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902798000.8", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2023-2066", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2023-2066", "primary_object": { "basename": "2023_Launch_Vibration_Damping_Scitech.pdf", "url": "https://authors.library.caltech.edu/records/qahtr-awd39/files/2023_Launch_Vibration_Damping_Scitech.pdf" }, "resource_type": "book_section", "pub_year": "2023", "author_list": "Wen, Alexander and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/r7hny-5r270", "eprint_id": 120474, "eprint_status": "archive", "datestamp": "2023-08-20 08:58:17", "lastmod": "2023-10-23 15:30:49", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hasanyan-Armanj-D", "name": { "family": "Hasanyan", "given": "Armanj D." }, "orcid": "0000-0003-3676-9439" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Modeling of Damage in Coilable Composite Shell Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Armanj Hasanyan, Sergio Pellegrino.", "abstract": "Coilable composite shell structures, composed of ultra-thin laminates, are ideal for deployable space structures applications. Their ability to be flattened and coiled for packaging, and deployed in their operational configuration makes them suitable for many space missions. Due to the complex states of stresses that occur in a composite shell during these processes (coiling, stowage, and deployment), material failure may be induced. This in turn would negatively affect the deployment, cause shape distortions, reduce the stiffness of the shell, or even lead to catastrophic failure of the mission. Therefore, predicting the failure modes and mechanisms of ultra-thin laminates at the structural scale is critical for design and certification purposes. However, this is often complicated by the complex microstructure and the multiple length-scales (micro and meso) associated with composites. This study presents a finite element model with progressive damage that effectively captures the ply failure modes. This is done through a damage constitutive model, where local cracks in the shell are smeared within a finite element. The fracture properties of interest are experimentally measured and incorporated into the model. The salient features of the model needed to capture failure are identified by comparing the simulation results with experiments. This is achieved by analyzing the coiling of a TRAC longeron shell structure.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-0364", "id_number": "CaltechAUTHORS:20230327-902890000.24", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902890000.24", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2023-0364", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2023-0364", "resource_type": "book_section", "pub_year": "2023", "author_list": "Hasanyan, Armanj D. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/v271v-hbb79", "eprint_id": 120471, "eprint_status": "archive", "datestamp": "2023-08-20 08:58:08", "lastmod": "2023-10-23 15:30:52", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ubamanyu-Uba-K", "name": { "family": "Ubamanyu", "given": "Uba K." }, "orcid": "0000-0002-3679-6173" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Nonlinear Behavior of IM7 Carbon Fibers in Compression Leads to Bending Nonlinearity of High-Strain Composites", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Uba K Ubamanyu and Sergio Pellegrino. \n\nThe authors acknowledge financial support from the Space Solar Power Project at Caltech. The authors are grateful for the help of Rebecca Gallivan, Widianto Moestopo, Thomas Tran, and Wenxin Zhang with single fiber direct compression experiments, and Professor Julia Greer for providing access to her experimental facilities and Alexander Wen for helpful discussions and suggestions. Test materials for this study were provided by Patz Materials & Technology.\n\nAccepted Version - 2023_Nonlinear_behavior_of_IM7_carbon_fibers_Scitech.pdf
", "abstract": "This paper presents an experimental characterization of carbon fibers under compression and the influence of their nonlinear behavior on the bending nonlinearity of high-strain composites (HSC). The study is focused on HexTow IM7, a pan-based carbon fiber compressed under in-situ scanning electron microscopic (SEM) imaging. The sample preparation and experimental procedure of both single fiber direct compression tests and column bending tests of HSC samples are presented. Nonlinearity at the individual fiber level could not be observed due to the limitations of the load cell in the single fiber direct compression experiment. Using the column bending tests, a shift in the neutral axis due to the nonlinear compression behavior of fibers is observed.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-0580", "id_number": "CaltechAUTHORS:20230327-902858000.18", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902858000.18", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2023-0580", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2023-0580", "primary_object": { "basename": "2023_Nonlinear_behavior_of_IM7_carbon_fibers_Scitech.pdf", "url": "https://authors.library.caltech.edu/records/v271v-hbb79/files/2023_Nonlinear_behavior_of_IM7_carbon_fibers_Scitech.pdf" }, "resource_type": "book_section", "pub_year": "2023", "author_list": "Ubamanyu, Uba K. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/kbws5-7ar77", "eprint_id": 120467, "eprint_status": "archive", "datestamp": "2023-08-20 08:57:53", "lastmod": "2023-10-23 15:30:37", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Marshall-Michael-A", "name": { "family": "Marshall", "given": "Michael A." }, "orcid": "0000-0002-4259-2484" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Slew Maneuver Constraints for Agile Flexible Spacecraft", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Michael A. Marshall and Sergio Pellegrino. \n\nThe authors thank Antonio Pedivellano for help in developing the high-fidelity Abaqus finite element model used in the homogenization procedure mentioned in Sec. V. The authors likewise thank Dan Scharf, W. Keats Wilkie, and Jay Warren for the helpful comments and insightful discussions regarding this work. This work benefited from ideas and discussions with Mike Paul Hughes and the other participants at the \"Non-Nuclear Exploration of the Solar System\" workshop organized by the W. M. Keck Institute for Space Studies in April 2021. \n\nM. A. Marshall was supported by a NASA Space Technology Research Fellowship. Financial support from the California Institute of Technology (Caltech) Space Solar Power Project is also gratefully acknowledged.\n\nAccepted Version - 2023_Slew_maneuver_constraints_SciTech.pdf
", "abstract": "Traditional spacecraft design paradigms rely on stiff bus structures with comparatively flexible appendages. More recent trends, however, trade deployed stiffness for packaging efficiency to stow apertures with larger areas inside existing launch vehicles. By leveraging recent advances in materials and structures, these spacecraft may be up to several orders of magnitude lighter and more flexible than the current state-of-the-art. Motivated by the goal of achieving agility despite structural flexibility, this paper proposes a quantitative method for determining structure-based performance limits for maneuvering flexible spacecraft. It then uses a geometrically nonlinear flexible multibody dynamics model of a representative very flexible spacecraft to verify this method. The results demonstrate that, contrary to common assumptions, other constraints impose more restrictive limits on maneuverability than the dynamics of the structure. In particular, it is shown that the available attitude control system momentum and torque are often significantly more limiting than the compliance of the structure. Consequently, these results suggest that there is an opportunity to design less-conservative, higher-performance space systems that can either be maneuvered faster, assuming suitable actuators are available, or built using lighter-weight, less-stiff architectures that move the structure-based performance limits closer to those of the rest of the system.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-1883", "id_number": "CaltechAUTHORS:20230327-902813000.11", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902813000.11", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship" }, { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2023-1883", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2023-1883", "primary_object": { "basename": "2023_Slew_maneuver_constraints_SciTech.pdf", "url": "https://authors.library.caltech.edu/records/kbws5-7ar77/files/2023_Slew_maneuver_constraints_SciTech.pdf" }, "resource_type": "book_section", "pub_year": "2023", "author_list": "Marshall, Michael A. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/e9wva-yw491", "eprint_id": 120463, "eprint_status": "archive", "datestamp": "2023-08-20 08:57:43", "lastmod": "2023-10-23 15:30:31", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Allen-Brayden", "name": { "family": "Aller", "given": "Brayden" }, "orcid": "0000-0002-5258-4154" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Kinkaid-Nathan", "name": { "family": "Kinkaid", "given": "Nathan" } }, { "id": "Mejia-Ariza-Juan", "name": { "family": "Mejia-Ariza", "given": "Juan" } }, { "id": "Otis-Richard-A", "name": { "family": "Otis", "given": "Richard" } }, { "id": "Chan-Patrick-Hon-Man", "name": { "family": "Chan", "given": "Patrick Hon Man" } }, { "id": "Pena-Francisco", "name": { "family": "Pena", "given": "Francisco" }, "orcid": "0000-0003-2060-0428" } ] }, "title": "Strain Measurement in Coilable Thin Composite Shells with Embedded Fiber Bragg Grating Sensors", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2023 by Brayden Aller, Sergio Pellegrino, Nathan Kinkaid, Juan Mejia-Ariza, Richard Otis, Patrick Hon Man Chan and Francisco Pena. \n\nThe research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). Support from the Caltech Space Solar Power Project is acknowledged. The authors would also like to acknowledge the contribution of Uba K. Ubamanyu for his input on the experimental setup used in this work.\n\nAccepted Version - 2023_Strain_measurement_SciTech.pdf
", "abstract": "Progress towards the use of ultra-thin fiber Bragg grating sensors for the in-situ strain measurement of coilable thin composite shells is presented. The first part of this work presents the manufacturing procedure used in the construction of these composite shells with embedded sensors. The second part of this work investigates how embedded ultra-thin fiber Bragg grating sensors affect the bending stiffness and failure curvature of these laminates through the use of the column bending test. The influence of the embedded sensors on the failure of these laminates is further investigated through \u03bcCT imaging after failure.", "date": "2023-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2023-2399", "id_number": "CaltechAUTHORS:20230327-902775000.4", "isbn": "978-1-62410-699-6", "book_title": "AIAA SCITECH 2023 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230327-902775000.4", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL/Caltech", "grant_number": "80NM0018D0004" }, { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2023-2399", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2023-2399", "primary_object": { "basename": "2023_Strain_measurement_SciTech.pdf", "url": "https://authors.library.caltech.edu/records/e9wva-yw491/files/2023_Strain_measurement_SciTech.pdf" }, "resource_type": "book_section", "pub_year": "2023", "author_list": "Aller, Brayden; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/3n3az-5fa66", "eprint_id": 113386, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:27", "lastmod": "2023-10-23 15:34:37", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gdoutos-Eleftherios-E", "name": { "family": "Gdoutos", "given": "Eleftherios" } }, { "id": "Sommer-Charles-F", "name": { "family": "Sommer", "given": "Charles F." } }, { "id": "Truong-Alan", "name": { "family": "Truong", "given": "Alan" } }, { "id": "Wen-Alexander", "name": { "family": "Wen", "given": "Alexander" } }, { "id": "Pedivellano-Antonio", "name": { "family": "Pedivellano", "given": "Antonio" }, "orcid": "0000-0003-2321-7301" }, { "id": "Ubamanyu-Kanthasamy", "name": { "family": "Ubamanyu", "given": "Kanthasamy" } }, { "id": "Madonna-Richard-G", "name": { "family": "Madonna", "given": "Richard G." }, "orcid": "0000-0002-8191-4896" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Development of the Deployable on-Orbit ultraLight Composite Experiment (DOLCE) for the Space Solar Power Project Demonstration Mission", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by Eleftherios Gdoutos, Charles Sommer, Alan Truong, Alexander Wen, Antonio Pedivellano, Uba Ubamanyu, Rich Madonna, Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.", "abstract": "We describe the development of an engineering model of the DOLCE payload which will demonstrate on orbit for the first time the deployment of an ultralight Caltech SSPP structure. Deployment tests at the subsystem and system levels, launch load analysis and testing, and accelerated aging tests have been conducted. The DOLCE payload will be launched with the SSPD-1 mission which will demonstrate space-based solar power key enabling technologies in photovoltaics, power beaming, and deployable structures.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-1266", "id_number": "CaltechAUTHORS:20220210-928385000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928385000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-1266", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2022-1266", "resource_type": "book_section", "pub_year": "2022", "author_list": "Gdoutos, Eleftherios; Sommer, Charles F.; et el." }, { "id": "https://authors.library.caltech.edu/records/6vf0h-xac18", "eprint_id": 113390, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:40", "lastmod": "2023-10-23 15:34:57", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Allen-Brayden", "name": { "family": "Aller", "given": "Brayden" }, "orcid": "0000-0002-5258-4154" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Kinkaid-Nathan", "name": { "family": "Kinkaid", "given": "Nathan" } }, { "id": "Mejia-Ariza-Juan", "name": { "family": "Mejia-Ariza", "given": "Juan" } }, { "id": "Chan-Patrick", "name": { "family": "Chan", "given": "Patrick" } }, { "id": "Pena-Francisco", "name": { "family": "Pena", "given": "Francisco" } } ] }, "title": "Health Monitoring of High Strain Composites Using Embedded Fiber Bragg Grating Sensors", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by Brayden Aller, Sergio Pellegrino, Nathan Kinkaid, Juan Mejia-Ariza, Richard Otis, Patrick Hon Man Chan and Francisco Pena. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.", "abstract": "A study on the use of fiber Bragg grating sensors to measure strains in thin-walled composite structures is presented. It includes measurement of the gage factor, or strain conversion coefficient, of small diameter fiber optic sensors. Fiber Bragg grating sensor arrays were embedded into high strain composites and the buildup of strains during manufacturing was tracked. \u03bcCT scans of these composites were taken after curing to analyze the micro-structure in the regions surrounding the embedded sensors. Composite laminates with embedded sensors were subjected to a controlled coiling experiment to evaluate the accuracy of the sensors in measuring internal strains.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-1622", "id_number": "CaltechAUTHORS:20220210-928413000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928413000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-1622", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2022-1622", "resource_type": "book_section", "pub_year": "2022", "author_list": "Aller, Brayden; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/bxwse-hpj31", "eprint_id": 113387, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:30", "lastmod": "2023-10-23 15:34:52", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Canales-Fabricio-G", "name": { "family": "Canales", "given": "Fabricio G." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "High-Fidelity Simulations of Thin-Shell Deployable Structures with Adaptive Meshing", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by F. Gianfranco Canales and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.", "abstract": "An adaptive meshing procedure is developed for the analysis of thin shell structures that experience localized elastic deformations associated with the formation of folds. The refinement criterion for remeshing takes into consideration the localization of deformation in the folds, while avoiding excessive refinement outside this region. The local bending strains in two principal directions are used to construct the refinement criterion. A geometrical parameter related to a boundary layer effect is shown to be effective as a limit length for refinement. Isogeometric shell finite elements are used for the simulations. Different tape spring geometries are simulated to illustrate the generality and efficiency of the proposed adaptive procedure.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-1269", "id_number": "CaltechAUTHORS:20220210-928394000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928394000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-1269", "name": "AIAA Paper" } ] }, "doi": "10.2514/6.2022-1269", "resource_type": "book_section", "pub_year": "2022", "author_list": "Canales, Fabricio G. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/0fknb-fc114", "eprint_id": 113394, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:53", "lastmod": "2023-10-23 15:35:04", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wen-Alexander", "name": { "family": "Wen", "given": "Alexander" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Launch Vibration of Pre-Tensioned Coiled Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by the American Institute of Aeronautics and Astronautics, Inc.", "abstract": "Relative movement between slipping layers in a coil due to vibration can cause defects in the structure or damage functional elements, such as photovoltaic cells, attached to the structure. Radial contact pressure between successive layers due to coiling pre-tension provides a frictional force that can be used to resist inter-layer slip. In this study, we propose a stress-field based, analytical friction model to use as a criterion for estimating the frictional shear capacity of a wound roll prior to the onset of slip. Because the radial pressure varies with radial position in the coil, the shear capacity against slippage also varies with position. This analytical shear capacity can then be compared against the shear resultants obtained in finite-element simulations of coiled structures undergoing vibration load. Rather than modeling discrete windings of wound rolls, the starting coiled-stiff assumption is the coil is tensioned sufficiently to behave as a solid. Thus, a finite-element vibration study of a homogenized solid is used to find the loads and locations where shear resultant is larger than the estimated shear capacity, indicating slip. The validity of the coiled-stiff assumption is experimentally verified using a vibration experiment that measures the variation in apparent stiffness of a coiled membrane wound under varying tensions.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-1883", "id_number": "CaltechAUTHORS:20220210-928446000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928446000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-1883", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2022-1883", "resource_type": "book_section", "pub_year": "2022", "author_list": "Wen, Alexander and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/y0yab-v0024", "eprint_id": 113395, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:57", "lastmod": "2023-10-23 15:35:26", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arya-Manan", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Hodges-Richard", "name": { "family": "Hodges", "given": "Richard" } }, { "id": "Sauder-Jonathan-F", "name": { "family": "Sauder", "given": "Jonathan F." } }, { "id": "Horst-Stephen", "name": { "family": "Horst", "given": "Stephen" } }, { "id": "Mobrem-Mehran", "name": { "family": "Mobrem", "given": "Mehran" } }, { "id": "Pedivellano-Antonio", "name": { "family": "Pedivellano", "given": "Antonio" }, "orcid": "0000-0003-2321-7301" }, { "id": "Wen-Alexander", "name": { "family": "Wen", "given": "Alexander" } }, { "id": "Truong-Alan", "name": { "family": "Truong", "given": "Alan" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Lightweight Composite Reflectarray that can be Flattened, Folded, and Coiled for Compact Stowage", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by the American Institute of Aeronautics and Astronautics, Inc. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner.", "abstract": "Herein is presented a design for a lightweight 5 m x 1 m radio-frequency (RF) reflector that can be flattened, folded, and coiled for compact stowage on board an ESPA-class spacecraft. The reflector is a reflectarray that operates at 3.2 GHz. Compared to state-of-the-art technologies for RF reflectors, the presented design has advantages in terms of areal density, stiffness, deployed stability, and scalability. Thermal and structural analysis is presented to demonstrate deployed stiffness and thermoelastic stability of the proposed design. Thermal analysis is used to predict in-space deployed temperatures in an operational condition, and structural finite element analysis is used to predict deployed vibration modes and frequencies, and the thermoelastic deformation of the deployed reflector. Also presented are the fabrication, assembly, and testing of two one-third-scale-length full-scale-width 1.7 m x 1 m test articles. These test articles are used to experimentally demonstrate RF functioning, stowage, deployment, and RF performance after deployment.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-1886", "id_number": "CaltechAUTHORS:20220210-928455000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928455000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-1886", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2022-1886", "resource_type": "book_section", "pub_year": "2022", "author_list": "Arya, Manan; Hodges, Richard; et el." }, { "id": "https://authors.library.caltech.edu/records/rxfxj-kd732", "eprint_id": 113382, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:14", "lastmod": "2023-10-23 15:34:43", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ubamanyu-Kanthasamy", "name": { "family": "Ubamanyu", "given": "Kanthasamy" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Micromechanics Modeling of Time-dependent Failure of Stowed High-strain Composite Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by Uba K Ubamanyu and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.", "abstract": "Deployable structures made of thin-ply carbon fiber-reinforced composites are of interest due to their high stiffness to weight ratio, high packaging efficiency, and ability to deploy by the release of stored strain energy. For most applications, the largest strains are applied for the longest time during stowage, and viscoelastic polymers in these fiber-reinforced composites are prone to time-dependent deformation growth and rupture. This paper presents a study of the time-dependent deformation growth and time-dependent failure mechanisms using a micromechanics-based 3D finite element model representation of the composite. The study is focused on a repeating unit cell of a cross-ply carbon fiber laminate consisting of linear-elastic transversely isotropic fibers embedded in a linear viscoelastic matrix. A parametric study of initial fiber misalignment angle and its influence on the deformation growth and time to rupture is presented.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-0649", "id_number": "CaltechAUTHORS:20220210-928345000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928345000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-0649", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2022-0649", "resource_type": "book_section", "pub_year": "2022", "author_list": "Ubamanyu, Kanthasamy and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/h846m-vrm42", "eprint_id": 113380, "eprint_status": "archive", "datestamp": "2023-08-20 06:28:08", "lastmod": "2023-10-23 15:34:24", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Luo-Wen", "name": { "family": "Luo", "given": "Wen" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Propagating Instabilities in Coilable Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2022 by the American Institute of Aeronautics and Astronautics, Inc.", "abstract": "Coilable booms consisting of thin composite shells bonded along a common edge are being considered for novel deployable spacecraft structures. These booms have many desirable features such as light weight, high stiffness, and high packaging efficiency, but this successful realization poses new challenges. In this paper, we study the propagating buckles that have been observed in the transition region between the coiled and deployed parts of the booms. These buckles, which can cause local stress concentrations and material failure, are typical of booms with built-up sections. They do not occur in tape springs. We investigate the root cause for the propagating buckles and discuss the possibility of limiting the buckle growth by increasing the material shear modulus.", "date": "2022-01-03", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2022-0407", "id_number": "CaltechAUTHORS:20220210-928328000", "isbn": "978-1-62410-631-6", "book_title": "AIAA SCITECH 2022 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220210-928328000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2022-0407", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2022-0407", "resource_type": "book_section", "pub_year": "2022", "author_list": "Luo, Wen and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/44ft3-jg113", "eprint_id": 113484, "eprint_status": "archive", "datestamp": "2023-08-20 06:12:18", "lastmod": "2023-10-23 15:23:34", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Fikes-Austin-C", "name": { "family": "Fikes", "given": "Austin" }, "orcid": "0000-0003-4889-5782" }, { "id": "Mizrahi-Oren-S", "name": { "family": "Mizrahi", "given": "Oren S." }, "orcid": "0000-0003-4271-8822" }, { "id": "Truong-Alan", "name": { "family": "Truong", "given": "Alan" } }, { "id": "Wiesem\u00fcller-Fabian", "name": { "family": "Wiesem\u00fcller", "given": "Fabian" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" } ] }, "title": "Fully Collapsible Lightweight Dipole Antennas", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2021 IEEE.", "abstract": "Flexible, deployable phased arrays enable novel and diverse applications but necessitate similarly flexible radiators. Here we present a light and flexible 10GHz dipole antenna, which is co-cured to a glass-fiber composite and suited for flexible phased arrays. The antennas are designed to dynamically conform to new array shapes and be flexible enough to fold completely flat and pop back up upon deployment. We employ a pop-up dipole with a capacitive fingers feed for impedance matching that is highly robust against manufacturing errors. Upon deployment, the antennas exhibit a \u221210 dB-bandwidth >1.5 GHz and >110\u00b0 half-power beam width single lobe pattern suitable for beamforming.", "date": "2021-12-04", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "545-546", "id_number": "CaltechAUTHORS:20220217-686367000", "isbn": "978-1-7281-4670-6", "book_title": "2021 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (APS/URSI)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220217-686367000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/aps/ursi47566.2021.9704302", "resource_type": "book_section", "pub_year": "2021", "author_list": "Fikes, Austin; Mizrahi, Oren S.; et el." }, { "id": "https://authors.library.caltech.edu/records/k328p-53774", "eprint_id": 107428, "eprint_status": "archive", "datestamp": "2023-08-20 01:22:38", "lastmod": "2023-10-23 15:53:13", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Andrew-J", "name": { "family": "Lee", "given": "Andrew" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Cable-Stayed Architectures for Large Deployable Spacecraft", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2021 by Andrew J. Lee and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nThe authors are grateful to Dr. Martin Mikulas of the National Institute of Aerospace for sharing his experience and for insightful discussions. Financial support from the Space Solar Power Project at the California Institute of Technology is gratefully acknowledged.\n\nAccepted Version - Lee-Pellegrino_Final.pdf
", "abstract": "Cable-stayed structural architectures, which use a combination of bending and axial load-carrying modes, are potentially more efficient than structural architectures that rely only on bending. However, they are not widely used at present. In this paper, an analytical framework is established to compare the load carrying performance of cable-stayed vs. bending architectures by considering limiting conditions such as global buckling, local shell buckling, material failure, and excessive deflection. For structures of equal span, material properties, mass, and maximum deflection limit, the most efficient cable-stayed geometry is determined and its performance is compared to that of the beam. It is shown that the cable-stayed architecture is more efficient at withstanding external loads and remains optimal over the bending architecture. Design charts for optimal designs of cable-stayed structures for a range of lengths and loads are provided.", "date": "2021-01-11", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2021-1386", "id_number": "CaltechAUTHORS:20210112-105611630", "isbn": "9781624106095", "book_title": "AIAA Scitech 2021 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210112-105611630", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2021-1386", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2021-1386", "primary_object": { "basename": "Lee-Pellegrino_Final.pdf", "url": "https://authors.library.caltech.edu/records/k328p-53774/files/Lee-Pellegrino_Final.pdf" }, "resource_type": "book_section", "pub_year": "2021", "author_list": "Lee, Andrew and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/nev08-17814", "eprint_id": 109127, "eprint_status": "archive", "datestamp": "2023-08-22 08:27:03", "lastmod": "2023-10-23 17:40:39", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pedivellano-Antonio", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Deployment Dynamics of Foldable Thin Shell Space Structures", "ispublished": "unpub", "full_text_status": "public", "keywords": "Space Structures; Finite Element Modeling; Longerons; Bending Stiffness; Finite Element Software; Thin Shell Structure; Kinetic Energy; Ball Bearings; Principal Stresses; Solar Cells", "note": "\u00a9 2021 by Antonio Pedivellano, Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nPublished Online: 4 Jan 2021. \n\nThe authors thank Dr. Xiaowei Deng (University of Hong Kong) for providing the Abaqus subroutine implementing the IMP membrane formulation, Alan Truong (Caltech) for building the strip prototypes used in the experiments in this paper, Charles Sommer (Caltech) for assisting with the deployment experiments in vacuum, and Fabien Royer (Caltech) for help with the bending tests of the strip prototypes. Financial support from the Space Solar Power Project at Caltech is gratefully acknowledged.\n\nAccepted Version - Pedivellano-Pellegrino-2021.pdf
", "abstract": "This paper investigates the deployment behavior of lightweight flexible space structures consisting of thin shell components. An extensive and detailed study of a symmetrically folded structure that dynamically deploys by releasing its stored elastic energy is presented. The challenges involved with ground testing of this structure are discussed, and a suspension system that allows propagation of the elastic folds is proposed. The dynamics of two 1 m-scale structural prototypes was measured using high-speed Digital Image Correlation. It is shown that, for the tests considered, the elastic folds remain stationary and behave as elastic hinges, resulting in a symmetric and repeatable deployment. Deployment experiments in air and vacuum showed that air mass significantly affects the dynamics of the structure, slowing its deployment by 70 %. However, this effect becomes negligible if the deployable structure is not covered by a film. A finite element model of the deployment is presented. The effects of air are approximated by an added mass to the structure, calculated through simple geometric arguments. This model shows good agreement with experimental results without increasing the associated computational time.", "date": "2021-01-11", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2021-0299", "id_number": "CaltechAUTHORS:20210514-081314705", "isbn": "9781624106095", "book_title": "AIAA Scitech 2021 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210514-081314705", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2021-0299", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2021-0299", "primary_object": { "basename": "Pedivellano-Pellegrino-2021.pdf", "url": "https://authors.library.caltech.edu/records/nev08-17814/files/Pedivellano-Pellegrino-2021.pdf" }, "resource_type": "book_section", "pub_year": "2021", "author_list": "Pedivellano, Antonio and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/ex7hq-32k66", "eprint_id": 107435, "eprint_status": "archive", "datestamp": "2023-08-20 01:23:03", "lastmod": "2023-10-23 15:53:34", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pedivellano-Antonio", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Propagation of Elastic Folds in the Deployment of Thin Shell Space Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2021 by Antonio Pedivellano, Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.", "abstract": "This paper investigates the deployment behavior of lightweight flexible space structures consisting of thin shell components. An extensive and detailed study of a symmetrically folded structure that dynamically deploys by releasing its stored elastic energy is presented. The challenges involved with ground testing of this structure are discussed, and a suspension system that allows propagation of the elastic folds is proposed. The dynamics of two 1 m-scale structural prototypes was measured using high-speed Digital Image Correlation. It is shown that, for the tests considered, the elastic folds remain stationary and behave as elastic hinges, resulting in a symmetric and repeatable deployment. Deployment experiments in air and vacuum showed that air mass significantly affects the dynamics of the structure, slowing its deployment by 70 %. However, this effect becomes negligible if the deployable structure is not covered by a film. A finite element model of the deployment is presented. The effects of air are approximated by an added mass to the structure, calculated through simple geometric arguments. This model shows good agreement with experimental results without increasing the associated computational time.", "date": "2021-01-11", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2021-0299", "id_number": "CaltechAUTHORS:20210112-105612128", "isbn": "9781624106095", "book_title": "AIAA Scitech 2021 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210112-105612128", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2021-0299", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2021-0299", "resource_type": "book_section", "pub_year": "2021", "author_list": "Pedivellano, Antonio and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/hhy45-ezd85", "eprint_id": 107429, "eprint_status": "archive", "datestamp": "2023-08-20 01:22:42", "lastmod": "2023-10-23 15:53:16", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Marshall-Michael-A", "name": { "family": "Marshall", "given": "Michael" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Reduced-Order Modeling for Flexible Spacecraft Deployment and Dynamics", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2021 by Michael A. Marshall and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nM. A. Marshall was supported by a NASA Space Technology Research Fellowship. Financial support from the California Institute of Technology (Caltech) Space Solar Power Project is also gratefully acknowledged. The authors thank W. Keats Wilkie and F. Gianfranco Canales Escobedo for the many helpful discussions.\n\nAccepted Version - Marshall-Pellegrino-2021.pdf
", "abstract": "The present work investigates reduced-order modeling for ultralight, packageable, and self-deployable spacecraft where reduced-order models (ROMs) are required to simulate deployment, structural dynamics during spacecraft maneuvers, and for real-time applications in trajectory optimization and control. In these contexts, ultralight, flexible spacecraft dynamics are characterized by geometrically nonlinear structural deformations combined with large rigid body motions. An approach based on proper orthogonal decomposition (POD), energy-conserving sampling and weighting (ECSW), and a floating frame of reference (FFR) is proposed to construct accurate and efficient ROMs. The proposed approach is then tested on a benchmark problem that involves geometrically nonlinear deformations, large rigid body motions, and strain energy release during dynamic snap-back, the last of which is analogous to the energy release during deployment. The resulting ROM for this benchmark problem is approximately 20% the size of the original full-order model with no appreciable loss of accuracy.", "date": "2021-01-11", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2021-1385", "id_number": "CaltechAUTHORS:20210112-105611714", "isbn": "9781624106095", "book_title": "AIAA Scitech 2021 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210112-105611714", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship" }, { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2021-1385", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2021-1385", "primary_object": { "basename": "Marshall-Pellegrino-2021.pdf", "url": "https://authors.library.caltech.edu/records/hhy45-ezd85/files/Marshall-Pellegrino-2021.pdf" }, "resource_type": "book_section", "pub_year": "2021", "author_list": "Marshall, Michael and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/mqmsq-dmn57", "eprint_id": 107423, "eprint_status": "archive", "datestamp": "2023-08-20 01:22:19", "lastmod": "2023-10-23 15:52:58", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Reddy-Narravula-Harshavardhan", "name": { "family": "Reddy", "given": "Narravula Harshavardhan" }, "orcid": "0000-0003-3897-8162" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Time-efficient geometrically non-linear finite element simulations of thin shell deployable structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2021 by Narravula Harshavardhan Reddy and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nThis research was funded by the Space Solar Power Project at Caltech.\n\nAccepted Version - Reddy-Pellegrino_final.pdf
", "abstract": "Isogeometric analysis of thin shells can provide higher continuity and exact geometric description. It is shown in the existing literature that isogeometric analysis converges with fewer degrees of freedom than C\u2070-continuous finite elements that use Langrange polynomial shape functions, but the speed of the solutions has not been previously assessed. In this research, the geometrically nonlinear bending of a thin shell deployable structure, a tape spring is studied, using both NURBS-based and C\u2070-continuous finite elements. The complex deformation of a tape spring makes it a perfect case study to compare the computational efficiency of the mentioned techniques. The simulations are carried out in the commercial software ABAQUS and LS-DYNA, and it is found that isogeometric analysis is at least three times slower than the C\u2070-continuous finite element methods.", "date": "2021-01-11", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2021-1795", "id_number": "CaltechAUTHORS:20210112-105611267", "isbn": "9781624106095", "book_title": "AIAA Scitech 2021 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210112-105611267", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Space Solar Power Project" } ] }, "other_numbering_system": { "items": [ { "id": "2021-1795", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2021-1795", "primary_object": { "basename": "Reddy-Pellegrino_final.pdf", "url": "https://authors.library.caltech.edu/records/mqmsq-dmn57/files/Reddy-Pellegrino_final.pdf" }, "resource_type": "book_section", "pub_year": "2021", "author_list": "Reddy, Narravula Harshavardhan and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/zt63z-d7141", "eprint_id": 107927, "eprint_status": "archive", "datestamp": "2023-08-20 01:16:41", "lastmod": "2023-10-23 16:20:06", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Williams-D-Elliott", "name": { "family": "Williams", "given": "D. Elliott" } }, { "id": "Dorn-Charles", "name": { "family": "Dorn", "given": "Charles" }, "orcid": "0000-0001-6516-2586" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" } ] }, "title": "Origami-Inspired Shape-Changing Phased Array", "ispublished": "unpub", "full_text_status": "public", "keywords": "phased arrays, origami, adaptive arrays, aperture, patch antennas, integrated circuits", "note": "\u00a9 2020 EuMA. \n\nThe authors thank Rogers Corp. for providing substrate materials and R. Lang, B. Abiri, D. Hodge, and Y. Li for their help. This work was supported in part by the MURI Grant\nFA9550-16-1-0566 via AFOSR.\n\nPublished - 09338189.pdf
", "abstract": "In situ geometric reconfiguration of a phased array increases the diversity of radiation patterns that can be synthesized by the array. Such shape-changing phased arrays enable new applications by dynamically conforming their shapes to the geometry best suited for a given task. This work presents the design and demonstration of an origami-inspired shape-changing array built out of identical radiating tiles held in place by a mechanical backbone. The array is capable of shifting into planar, spherical, and cylindrical configurations. The benefits of such an array are analyzed by comparing the properties of different geometries and verified with measurements of the first origami-inspired shape-changing phased array.", "date": "2021-01", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "344-347", "id_number": "CaltechAUTHORS:20210205-093044804", "isbn": "9782874870590", "book_title": "2020 50th European Microwave Conference (EuMC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210205-093044804", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "FA9550-16-1-0566" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.23919/eumc48046.2021.9338189", "primary_object": { "basename": "09338189.pdf", "url": "https://authors.library.caltech.edu/records/zt63z-d7141/files/09338189.pdf" }, "resource_type": "book_section", "pub_year": "2021", "author_list": "Williams, D. Elliott; Dorn, Charles; et el." }, { "id": "https://authors.library.caltech.edu/records/geyr4-fwg52", "eprint_id": 100663, "eprint_status": "archive", "datestamp": "2023-08-19 19:29:56", "lastmod": "2023-10-18 21:43:46", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Buckling of Ultralight Ladder-type Coilable Space Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2020 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2020.", "abstract": "We analyse the buckling and post-buckling behavior of ultralight ladder-type coilable structures for space solar power applications. The structures are composed of thin-shell longitudinal elements connected by thin rods, which can be flattened and packaged efficiently. Rather than relying on an eigenvalue based analysis, this paper presents an alternative approach to thin-shell buckling based on recent work on the stability of cylindrical and spherical shells. The stability of ladder-type structures loaded by normal pressure is studied using a probe that locally displaces the structure and a stability landscape for the structure is plotted. This landscape plot gives insight into the structure's buckling, post-buckling, and sensitivity to disturbances.", "date": "2020-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2020-1437", "id_number": "CaltechAUTHORS:20200113-083856811", "isbn": "978-1-62410-595-1", "book_title": "AIAA Scitech 2020 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200113-083856811", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2020-1437", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2020-1437", "resource_type": "book_section", "pub_year": "2020", "author_list": "Royer, Fabien and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/hpt2x-a2g53", "eprint_id": 100651, "eprint_status": "archive", "datestamp": "2023-08-19 19:29:17", "lastmod": "2023-10-18 21:42:53", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ubamanyu-K", "name": { "family": "Ubamanyu", "given": "Kanthasamy" } }, { "id": "Hasanyan-A-D", "name": { "family": "Hasanyan", "given": "Armanj D." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Experimental Study of Time-dependent Failure of High Strain Composites", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2020 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2020.", "abstract": "High strain composites for coilable space structures can undergo micro-structural changes in the time period between stowage and deployment. These changes include the accumulation of residual stresses in response to curvature changes (stress-relaxation) and accumulation of damage, which may lead to rupture of high strain composites. Currently, the mechanisms that cause damage growth and failure are not well understood. In this study, new experimental approaches are explored for applying constant curvature changes, that replicate the stowage conditions while imaging the evaluation of cracks on the compression surface and of damage in the micro-structure of the test sample. The test temperature is raised to accelerate the failure process.", "date": "2020-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2020-0207", "id_number": "CaltechAUTHORS:20200110-160834737", "isbn": "978-1-62410-595-1", "book_title": "AIAA Scitech 2020 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200110-160834737", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2020-0207", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2020-0207", "resource_type": "book_section", "pub_year": "2020", "author_list": "Ubamanyu, Kanthasamy; Hasanyan, Armanj D.; et el." }, { "id": "https://authors.library.caltech.edu/records/8s1mr-xk261", "eprint_id": 100656, "eprint_status": "archive", "datestamp": "2023-08-19 19:29:31", "lastmod": "2023-10-18 21:43:24", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hasanyan-A-D", "name": { "family": "Hasanyan", "given": "Armanj D." } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Interface Failure Analysis of Triangular Rollable and Collapsible (TRAC) Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2020 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2020.", "abstract": "Characterizing the interface bond of thin-ply composites is important for assessing the overall structural integrity. Due to the flexibility of thin composite laminates, it is not feasible to carry out mode I double cantilever beam (DCB) and mode II end notch flexure (ENF) tests, due to the large geometric changes undergone during testing. To reduce the compliance during testing, thick aluminum substrates are bonded to the two free-surfaces of the test laminates. DCB and ENF tests are specifically carried out in this configuration. A specific glass fiber plain weave interface of a 7-ply composite structure is tested. \u00b5CT imaging shows the presence of periodic voids of size scales of 200 \u00b5m, and local delaminated regions of 0 . 7 \u2212 5 . 6 mm. The former is attributed to capillary effects from the glass tows, while the latter is due to insufficient resin flow during the two-cure manufacturing process.", "date": "2020-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2020-0694", "id_number": "CaltechAUTHORS:20200113-081226991", "isbn": "978-1-62410-595-1", "book_title": "AIAA Scitech 2020 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200113-081226991", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2020-0694", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2020-0694", "resource_type": "book_section", "pub_year": "2020", "author_list": "Hasanyan, Armanj D.; Leclerc, Christophe; et el." }, { "id": "https://authors.library.caltech.edu/records/fts5s-bpd55", "eprint_id": 100654, "eprint_status": "archive", "datestamp": "2023-08-19 19:29:24", "lastmod": "2023-10-18 21:43:19", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pedivellano-A", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Sequentially Controlled Dynamic Deployment of Ultra-Thin Shell Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2020 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2020.", "abstract": "This paper presents an approach to achieve the staged deployment of planar structures composed of multiple thin-shell elements. Releasable constraints are used to prescribe intermediate, known configurations along a strain energy-driven deployment path. An analytical model is derived to design the nominal deployment sequence of the structure by identifying kinematically compatible paths. Then, a finite element model is developed to capture the dynamic behavior of the shells during a staged deployment. Practical considerations, such as the deployment envelope and incorporation of the structure in a deployment mechanism are discussed. Finally, the proposed deployment sequence is demonstrated experimentally.", "date": "2020-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2020-0690", "id_number": "CaltechAUTHORS:20200113-075647741", "isbn": "978-1-62410-595-1", "book_title": "AIAA Scitech 2020 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200113-075647741", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2020-0690", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2020-0690", "resource_type": "book_section", "pub_year": "2020", "author_list": "Pedivellano, Antonio; Gdoutos, Eleftherios; et el." }, { "id": "https://authors.library.caltech.edu/records/5vepc-c2j04", "eprint_id": 100655, "eprint_status": "archive", "datestamp": "2023-08-19 19:29:28", "lastmod": "2023-10-18 21:43:21", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios" } }, { "id": "Truong-Alan", "name": { "family": "Truong", "given": "Alan" } }, { "id": "Pedivellano-A", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultralight Deployable Space Structure Prototype", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2020 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2020.", "abstract": "We present a lab demonstration of the packaging and deployment of an ultralight space structure prototype composed of thin shell longerons and battens. The prototype is integrated with a thin polyimide membrane which serves as mass representative of multi-functional elements that could be integrated into this type of deployable, such as integrated power collection and wireless transmission tiles for space solar power. A deployment mechanism using actively controlled pressure to package and deploy this structure ensuring its integrity is described. The deployable structure and deployment mechanism designs are scalable to 60 m X 60 m structures. The structure's mass scaling to larger sizes is described.", "date": "2020-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2020-0692", "id_number": "CaltechAUTHORS:20200113-080052698", "isbn": "978-1-62410-595-1", "book_title": "AIAA Scitech 2020 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200113-080052698", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2020-0692", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2020-0692", "resource_type": "book_section", "pub_year": "2020", "author_list": "Gdoutos, Eleftherios; Truong, Alan; et el." }, { "id": "https://authors.library.caltech.edu/records/7v31v-s0k51", "eprint_id": 97656, "eprint_status": "archive", "datestamp": "2023-08-19 13:48:55", "lastmod": "2023-10-18 16:11:01", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "T\u00fcrk-D-A", "name": { "family": "T\u00fcrk", "given": "Daniel-Alexander" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Parametric Design of Conforming Joints for Thin-Shell Coilable Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 American Institute of Aeronautics and Astronautics.", "abstract": "This paper addresses the problem of designing and building structural connections (joints) for ultra-thin shells employed in large coilable structures for space applications. A conforming joint design concept for ladder-type coilable thin shells is proposed. A parametric design tool was developed to study the geometry of two joints that become overlapped in the coiled configuration as a function of the coiling radius and joint radii. Parametric design results are validated through finite element simulations. The proposed design tool provides a high level of design flexibility and is of interest in the spacecraft design process making use of ultra-thin shells.", "date": "2019-01-07", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-1259", "id_number": "CaltechAUTHORS:20190805-134838792", "isbn": "9781624105784", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838792", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2019-1259", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-1259", "resource_type": "book_section", "pub_year": "2019", "author_list": "T\u00fcrk, Daniel-Alexander and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/xzqen-ada85", "eprint_id": 97655, "eprint_status": "archive", "datestamp": "2023-08-19 13:48:52", "lastmod": "2023-10-18 16:10:58", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Reducing Stress Concentration in the Transition Region of Coilable Ultra-Thin-Shell Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 American Institute of Aeronautics and Astronautics.", "abstract": "High stress concentrations leading to material failure have been observed in TRAC booms coiled under tension around a circular hub. The stress concentrations are typically observed in the transition region between the fully deployed and coiled sections of the boom. A numerical simulation framework is proposed to model the coiling process analyses the stress distribution in the transition region. Isotropic booms are first studied to understand the effects of the cross-section geometry and the boundary conditions during coiling. Compressive stress is reduced by 13% and 26% by using a variable curvature cross-section and adding nip rollers in the coiling mechanism respectively. For an ultra-thin glass fiber-carbon fiber composite laminate, the compressive stress is similarly reduced by 24% and 11%. The variable curvature cross-section is shown to eliminate the stress concentration in the transition region.", "date": "2019-01-07", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-1522", "id_number": "CaltechAUTHORS:20190805-134838677", "isbn": "9781624105784", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838677", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2019-1522", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-1522", "resource_type": "book_section", "pub_year": "2019", "author_list": "Leclerc, Christophe and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/s9mmb-pby41", "eprint_id": 97649, "eprint_status": "archive", "datestamp": "2023-08-19 13:48:39", "lastmod": "2023-10-18 16:10:43", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pedivellano-A", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Stability Analysis of Coiled Tape Springs", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 American Institute of Aeronautics and Astronautics.", "abstract": "Tape springs have been used for many years in deployable booms and space mechanisms and currently are bing considered as components for more advanced deployable structures. Tape springs can be elastically coiled and will self-deploy when released. Their stability in the packaged configuration is critical for these applications. We propose a numerical and analytical framework to investigate the stability of coiled isotropic tape springs, where neither tension nor radial pressure are applied. Torsional and bending instabilities were observed when the ration between the coiled radius and the radius of the cross-section exceeded a critical value. A stability boundary is derived for different geometries and material properties. The effects of varying the number of coils and the self-contact conditions between adjacent loops of a tape spring are also studied, and the existence of out-of-plane instability modes is discussed.", "date": "2019-01-07", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-1523", "id_number": "CaltechAUTHORS:20190805-134838114", "isbn": "9781624105784", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838114", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2019-1523", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-1523", "resource_type": "book_section", "pub_year": "2019", "author_list": "Pedivellano, Antonio and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/cab99-hgm06", "eprint_id": 97647, "eprint_status": "archive", "datestamp": "2023-08-19 13:48:33", "lastmod": "2023-10-18 16:10:36", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios E." } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "T\u00fcrk-D-A", "name": { "family": "T\u00fcrk", "given": "Daniel-Alexander" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultralight Spacecraft Structure Prototype", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 American Institute of Aeronautics and Astronautics.", "abstract": "We demonstrate the development of a lightweight 1.7 m X 1.7 m prototype spacecraft structure with areal density of 150 g/m^2. The structure is composed of individual ladder-type components that can be used to support flexible multi0-functional elements such as integrated power collection and wireless transmission tiles used for space solar power. This spacecraft structure design is scalable up to 60 m X 60 m. The structural design, ultra-light component manufacture and, prototype assembly are demonstrated. Shape accuracy within 0.5\u00b0 from nominal is achieved and outlook for further mass reduction is described.", "date": "2019-01-07", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-1749", "id_number": "CaltechAUTHORS:20190805-134837694", "isbn": "9781624105784", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134837694", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2019-1749", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-1749", "resource_type": "book_section", "pub_year": "2019", "author_list": "Gdoutos, Eleftherios E.; Leclerc, Christophe; et el." }, { "id": "https://authors.library.caltech.edu/records/ycnca-90x66", "eprint_id": 99816, "eprint_status": "archive", "datestamp": "2023-08-19 13:47:39", "lastmod": "2023-10-18 18:50:03", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arya-M", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Sauder-J-F", "name": { "family": "Sauder", "given": "Jonathan" } }, { "id": "Hodges-R-E", "name": { "family": "Hodges", "given": "Richard E." }, "orcid": "0000-0002-1132-0259" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Large-Area Deployable Reflectarray Antenna for CubeSats", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 by the American Institute of Aeronautics and Astronautics, Inc. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner. \n\nPublished Online: 6 Jan 2019.", "abstract": "Herein is described a 1.5 m x 1.5 m reflectarray antenna designed to stow in a cylinder of 20 cm diameter and 9 cm height, and then be unfolded to provide an aperture suitable for radio frequency (RF) operations at X-band (8.4 GHz) and produce 39.6 dB of gain. The mass of the reflectarray, as measured for a full-scale prototype, is 1.75 kg. The reflectarray comprises a number of crossed-dipoles held 5 mm above a ground plane. The dipole layer and the ground plane are supported by thin planar composite facesheets; the separation between these facesheets is provided by thin composite collapsible 'S'-shaped-springs. The structure is divided into a number of quartz-epoxy composite strips arranged in concentric squares and connected to each other using slipping folds. The strips can be flattened, star-folded, and wrapped to package within the compact cylindrical volume. A full-scale prototype of this reflectarray was constructed and tested. Stowage in the design volume was successfully demonstrated, and all RF performance requirements were met, as shown by a pre-stowage RF test and a post-stowage RF test.", "date": "2019-01-06", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-2257", "id_number": "CaltechAUTHORS:20191112-154118926", "isbn": "978-1-62410-578-4", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191112-154118926", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2019-2257", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "Space-Solar-Power-Project" }, { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-2257", "resource_type": "book_section", "pub_year": "2019", "author_list": "Arya, Manan; Sauder, Jonathan; et el." }, { "id": "https://authors.library.caltech.edu/records/9yjnt-yqa94", "eprint_id": 110824, "eprint_status": "archive", "datestamp": "2023-08-19 13:47:44", "lastmod": "2023-10-23 19:53:31", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ferraro-Serena", "name": { "family": "Ferraro", "given": "S." }, "orcid": "0000-0002-6038-7863" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Topology Optimization of Composite Self-Deployable Thin Shells with Cutouts", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 by the American Institute of Aeronautics and Astronautics, Inc. \n\nPublished Online: 6 Jan 2019. \n\nThis work was supported by a NASA Space Technology Research Fellowship. S.F. would like to acknowledge the mentorship of Dr. William Doggett, NASA Langley, and Thibaud Talon, Caltech, for exchange of ideas.\n\nAccepted Version - Ferraro2019.pdf
", "abstract": "The paper presents topology optimization studies of selfs-deployable joints in thin-walled tubular structures. The joints are made entirely of ultra-thin, fiber reinforced composite materials. The objective of this research is to strategically position cutouts on the joints so that they can fold without failing, while maximizing the deployed bending stiffness. The optimal shape and position of cutouts are the results of concurrent topology optimization of these composite, thin-shell joints with geometrical non-linearities, due to their folding and self-deployable nature. Numerical methods to accurately detect failure are implemented and results from a novel level-set method for topology optimization are compared to results from classical parametric optimization and preliminary designs based on physical intuition.", "date": "2019-01-06", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2019-1524", "id_number": "CaltechAUTHORS:20210913-222227787", "isbn": "978-1-62410-578-4", "book_title": "AIAA Scitech 2019 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210913-222227787", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship" } ] }, "other_numbering_system": { "items": [ { "id": "2019-1524", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2019-1524", "primary_object": { "basename": "Ferraro2019.pdf", "url": "https://authors.library.caltech.edu/records/9yjnt-yqa94/files/Ferraro2019.pdf" }, "resource_type": "book_section", "pub_year": "2019", "author_list": "Ferraro, S. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/ak4db-6jh60", "eprint_id": 100201, "eprint_status": "archive", "datestamp": "2023-08-19 13:42:54", "lastmod": "2024-01-14 22:03:52", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Marshall-M-A", "name": { "family": "Marshall", "given": "Michael A." } }, { "id": "Goel-Ashish", "name": { "family": "Goel", "given": "Ashish" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Attitude maneuver design for planar space solar power satellites", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2019 Published for the American Astronautical Society by Univelt, Incorporated. \n\nAAS 19-287. \n\nWe thank the Caltech Space Solar Power Project team, especially Dr. Dan Scharf (NASA-JPL), Dr. Richard Madonna (Caltech), and Dr. Terry Gdoutos (Caltech), for helpful comments and discussions. M.M. was supported by a NASA Space Technology Research Fellowship. Financial support from the Space Solar Power Project at Caltech is also acknowledged.\n\nOther - Marshall_2019p1451.pdf
", "abstract": "This paper investigates the attitude dynamics of a planar space solar power satellite (SSPS) by formulating the power-optimal guidance problem as a nonlinear trajectory optimization problem. The power-optimal guidance problem determines the orientation of an SSPS throughout its orbit that maximizes the amount of power transmitted to Earth. This transmitted power is a function of the relative geometry between the SSPS, the Sun, and the receiving station. Hence, it is inherently coupled to the attitude of the SSPS, i.e., the orientation that maximizes power transmission changes as the relative geometry changes. We first approximate the discretized trajectory optimization problem as a quadratic program (QP). We then solve the QP to obtain attitude trajectory designs for various orbits. These solutions highlight how maximizing transmitted power typically requires large slew maneuvers. Ultimately, by quantifying control and propellant requirements for various orbits, we emphasize how maneuver dynamics play an important role in SSPS design.", "date": "2019-01", "date_type": "published", "publisher": "American Astronautical Society", "place_of_pub": "San Diego, CA", "pagerange": "1451-1470", "id_number": "CaltechAUTHORS:20191205-093402644", "isbn": "9780877036593", "book_title": "Spaceflight Mechanics 2019", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191205-093402644", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship" }, { "agency": "Space Solar Power Project" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "contributors": { "items": [ { "id": "Topputo-F", "name": { "family": "Topputo", "given": "Francesco" } }, { "id": "Sinclair-A-J", "name": { "family": "Sinclair", "given": "Andrew J." } }, { "id": "Wilkins-M-P", "name": { "family": "Wilkins", "given": "Matthew P." } }, { "id": "Zanetti-R", "name": { "family": "Zanetti", "given": "Renato" } } ] }, "primary_object": { "basename": "Marshall_2019p1451.pdf", "url": "https://authors.library.caltech.edu/records/ak4db-6jh60/files/Marshall_2019p1451.pdf" }, "resource_type": "book_section", "pub_year": "2019", "author_list": "Marshall, Michael A.; Goel, Ashish; et el." }, { "id": "https://authors.library.caltech.edu/records/mxdy0-tr609", "eprint_id": 94442, "eprint_status": "archive", "datestamp": "2023-08-19 10:52:53", "lastmod": "2023-10-20 17:57:52", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Li-Yang", "name": { "family": "Li", "given": "Yang" }, "orcid": "0000-0002-4939-8174" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Design of Structures With Multiple Equilibrium Configurations", "ispublished": "unpub", "full_text_status": "public", "keywords": "Equilibrium (Physics), Design", "note": "\u00a9 2018 by ASME. \n\nPaper No. DETC2018-86157.", "abstract": "Being able to design structures with multiple equilibrium configurations is the basis for the design of multi-stable structures, which are of interest for future research on multi-configuration structures that require 'simple' actuation schemes. It is already known that adding elastic springs to a rigid mechanism can create structures with multiple equilibrium configurations. The spring properties, such as their rest positions, can be taken as design parameters that can be used to achieve specific equilibrium configurations of the structure. This paper provides a linearized formulation for the equilibrium constraints that can be solved for the rest positions of the springs. This method allows the design of specific equilibrium configurations. It can also handle more complex problems and is easier to solve in comparison to existent techniques. An example design of a four-bar linkage that has 5 equilibrium configurations is presented.", "date": "2018-08", "date_type": "published", "publisher": "American Society of Mechanical Engineers", "place_of_pub": "New York, NY", "pagerange": "Art. No. V05BT07A063", "id_number": "CaltechAUTHORS:20190404-081554007", "isbn": "978-0-7918-5181-4", "book_title": "42nd Mechanisms and Robotics Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190404-081554007", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1115/DETC2018-86157", "resource_type": "book_section", "pub_year": "2018", "author_list": "Li, Yang and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/6snf3-8ft69", "eprint_id": 89429, "eprint_status": "archive", "datestamp": "2023-08-19 09:33:58", "lastmod": "2023-10-18 22:44:41", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Talon-T", "name": { "family": "Talon", "given": "Thibaud" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Shape Measurement of Large Structures in Space: Experiments", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "sun, sensor, shape, reconstruction, measurement, structure, solar, sail, antenna array, laboratory, experiment", "note": "\u00a9 2018 IEEE. \n\nThis research is supported by the Northrop Grumman Corporation and the Space Solar Power Project at Caltech.", "abstract": "A method to reconstruct the shape of a large planar structure in space is introduced and demonstrated through a lab-scale experiment. Lightweight sun sensors are distributed on the structure to measure local angles relative to the sun. The methodology to integrate the measured angles into the shape of the structure, based on a decomposition of the shape into basis functions is introduced. This methodology has been implemented on a lab-scale experiment. The design of the sensors is based on a 4 pixel pinhole camera. The calibration method for these sensors is presented as well as the techniques to integrate and communicate with them. A 1.2 m by 20 cm structure was designed and populated with sensors to show the performance of an integrated system. Preliminary results show an accuracy of 1 mm RMS on the shape reconstruction of this structure.", "date": "2018-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "581-584", "id_number": "CaltechAUTHORS:20180906-143935251", "isbn": "978-1-5386-2474-6", "book_title": "2018 5th IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180906-143935251", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Space Solar Power Project" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/MetroAeroSpace.2018.8453578", "resource_type": "book_section", "pub_year": "2018", "author_list": "Talon, Thibaud and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/p05hy-rjp75", "eprint_id": 91659, "eprint_status": "archive", "datestamp": "2023-08-19 09:37:23", "lastmod": "2023-10-19 23:36:57", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Naqavi-A", "name": { "family": "Naqavi", "given": "Ali" } }, { "id": "Loke-S-P", "name": { "family": "Loke", "given": "Samuel P." } }, { "id": "Saive-P", "name": { "family": "Saive", "given": "Philipp" } }, { "id": "Roy-T-A", "name": { "family": "Roy", "given": "Tatiana A." } }, { "id": "Vinogradova-T-G", "name": { "family": "Vinogradova", "given": "Tatiana G." } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios E." } }, { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Fikes-A-C", "name": { "family": "Fikes", "given": "Austin" } }, { "id": "Bohn-F", "name": { "family": "Bohn", "given": "Florian" } }, { "id": "Abiri-B", "name": { "family": "Abiri", "given": "Behrooz" }, "orcid": "0000-0002-3317-2752" }, { "id": "Hashemi-M-R", "name": { "family": "Hashemi", "given": "Mohammed R." } }, { "id": "Gal-Katziri-M", "name": { "family": "Gal-Katziri", "given": "Matan" }, "orcid": "0000-0001-9100-1188" }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" } ] }, "title": "Ultralight Energy Converter Tile for the Space Solar Power Initiative", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2018 IEEE.", "abstract": "We have fabricated a functional prototype of an ultralight power converter tile; a modular building block for a space-based solar power system. The tile is \u223c10\u00d715 cm in area, and weighs \u223c1.5 kg/m^2. It comprises a photovoltaic (PV) solar energy collector, a radio-frequency (RF) power converter, and an array of transmission antennas. The PV collector subassembly utilizes \u223c15x, 1D parabolic trough reflective concentrators with triple-junction (3J) solar cells. It has areal mass of \u223c0.8 kg/m^2, 74% optical efficiency, and a peak specific power of \u223c230W/kg. We demonstrated wireless power transmission over a distance of \u223c50 cm in our lab. Analysis of the sources of mass and inefficiency suggest a path towards achieving dramatically higher performance with future designs.", "date": "2018-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "3357-3359", "id_number": "CaltechAUTHORS:20181210-140402265", "isbn": "9781538685297", "book_title": "2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181210-140402265", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/pvsc.2018.8547403", "resource_type": "book_section", "pub_year": "2018", "author_list": "Kelzenberg, Michael D.; Espinet-Gonz\u00e1lez, Pilar; et el." }, { "id": "https://authors.library.caltech.edu/records/2zt67-fdc15", "eprint_id": 87159, "eprint_status": "archive", "datestamp": "2023-08-19 08:25:09", "lastmod": "2024-01-14 20:15:02", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wei-Yuchen", "name": { "family": "Wei", "given": "Yuchen" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Phenomenological model for coupled multi-axial piezoelectricity", "ispublished": "unpub", "full_text_status": "public", "keywords": "Ferroelectrics, phenomenological model, parameter calibration, electro-mechanical coupling", "note": "\u00a9 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nThe authors acknowledge helpful discussions with Professor Robert McMeeking and Professor Christopher Lynch.\n\nPublished - 105960R.pdf
", "abstract": "A quantitative calibration of an existing phenomenological model for polycrystalline ferroelectric ceramics is presented. The model relies on remnant strain and polarization as independent variables. Innovative experimental and numerical model identification procedures are developed for the characterization of the coupled electro-mechanical, multi-axial nonlinear constitutive law. Experiments were conducted on thin PZT-5A4E plates subjected to cross-thickness electric field. Unimorph structures with different thickness ratios between PZT-5A4E plate and substrate were tested, to subject the piezo plates to coupled electro-mechanical fields. Material state histories in electric field-strain-polarization space and stress-strain-polarization space were recorded. An optimization procedure is employed for the determination of the model parameters, and the calibrated constitutive law predicts both the uncoupled and coupled experimental observations accurately.", "date": "2018-03-22", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 105960R", "id_number": "CaltechAUTHORS:20180615-113248296", "isbn": "9781510616882", "book_title": "Behavior and Mechanics of Multifunctional Materials and Composites XII", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180615-113248296", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Naguib-H-E", "name": { "family": "Naguib", "given": "Hani E." } } ] }, "doi": "10.1117/12.2296346", "primary_object": { "basename": "105960R.pdf", "url": "https://authors.library.caltech.edu/records/2zt67-fdc15/files/105960R.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Wei, Yuchen and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/z36ae-22p78", "eprint_id": 87160, "eprint_status": "archive", "datestamp": "2023-08-19 07:55:47", "lastmod": "2024-01-14 20:15:05", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Scorticati-D", "name": { "family": "Scorticati", "given": "Davide" } }, { "id": "Crapella-G", "name": { "family": "Crapella", "given": "Giacomo" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Fast and broadband detector for laser radiation", "ispublished": "unpub", "full_text_status": "public", "keywords": "Fast, Broadband, Thermal, Detector, Laser, LITV", "note": "\u00a9 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).\n\nPublished - 105390I.pdf
", "abstract": "We developed a fast detector (patent pending) based on the Laser Induced Transverse Voltage (LITV) effect. The advantage of detectors using the LITV effect over pyroelectric sensors and photodiodes for laser radiation measurements is the combination of an overall fast response time, broadband spectral acceptance, high saturation threshold to direct laser irradiation and the possibility to measure pulsed as well as cw-laser sources. \n\nThe detector is capable of measuring the energy of single laser pulses with repetition frequencies up to the MHz range, adding the possibility to also measure the output power of cw-lasers. \n\nMoreover, the thermal nature of the sensor enables the capability to work in a broadband spectrum, from UV to THz as well as the possibility of operating in a broad-range (10^(-3)-10^2 W/cm^2 ) of incident average optical power densities of the laser radiation, without the need of adopting optical filters nor other precautions.", "date": "2018-02-22", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 105390I", "id_number": "CaltechAUTHORS:20180615-114153851", "isbn": "9781510615632", "book_title": "Photonic Instrumentation Engineering V", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180615-114153851", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Soskind-Y-G", "name": { "family": "Soskind", "given": "Yakov G." } } ] }, "doi": "10.1117/12.2294002", "primary_object": { "basename": "105390I.pdf", "url": "https://authors.library.caltech.edu/records/z36ae-22p78/files/105390I.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Scorticati, Davide; Crapella, Giacomo; et el." }, { "id": "https://authors.library.caltech.edu/records/4afjx-yfv11", "eprint_id": 97643, "eprint_status": "archive", "datestamp": "2023-08-19 07:20:01", "lastmod": "2023-10-18 16:10:23", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios E." } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Bohn-F", "name": { "family": "Bohn", "given": "Florian" } }, { "id": "Abiri-B", "name": { "family": "Abiri", "given": "Behrooz" }, "orcid": "0000-0002-3317-2752" }, { "id": "Hashemi-M-R", "name": { "family": "Hashemi", "given": "Mohammed R." } }, { "id": "Gal-Katziri-M", "name": { "family": "Gal-Katziri", "given": "Matan" }, "orcid": "0000-0001-9100-1188" }, { "id": "Fikes-A-C", "name": { "family": "Fikes", "given": "Austin" } }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "A lightweight tile structure integrating photovoltaic conversion and RF power transfer for space solar power applications", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics. \n\nFinancial support from the Northrop Grumman Corporation is gratefully acknowledged.\n\nAccepted Version - Gdoutos_et_al_2018.pdf
", "abstract": "We demonstrate the development of a prototype lightweight (1.5 kg/m^3) tile structure capable of photovoltaic solar power capture, conversion to radio frequency power, and transmission through antennas. This modular tile can be repeated over an arbitrary area to forma large aperture which could be placed in orbit to collect sunlight and transmit electricity to any location. Prototype design is described and validated through finite element analysis, and high-precision ultra-light component manufacture and robust assembly are described.", "date": "2018-01-08", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-2202", "id_number": "CaltechAUTHORS:20190805-134837271", "isbn": "9781624105302", "book_title": "AIAA Scitech 2018 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134837271", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2018-2202", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2018-2202", "primary_object": { "basename": "Gdoutos_et_al_2018.pdf", "url": "https://authors.library.caltech.edu/records/4afjx-yfv11/files/Gdoutos_et_al_2018.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Gdoutos, Eleftherios E.; Leclerc, Christophe; et el." }, { "id": "https://authors.library.caltech.edu/records/rbm1k-p9p24", "eprint_id": 97963, "eprint_status": "archive", "datestamp": "2023-08-19 07:20:11", "lastmod": "2023-10-18 16:55:07", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Pedivellano-A", "name": { "family": "Pedivellano", "given": "Antonio" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Stress Concentration and Material Failure During Coiling of Ultra-Thin TRAC Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics. \n\nThe authors acknowledge financial support from the Northrop Grumman Corporation, the Natural Sciences and Engineering Research Council of Canada and the Keck Institute for Space Studies.\n\nAccepted Version - Leclerc_Pedivellano_Pellegrino2018.pdf
", "abstract": "Ultra-thin TRAC booms are a promising technology for large deployable structures for space applications. A manufacturing process producing composites TRAC booms with flange thickness as low as 53 \u03bcm is proposed. Coiling behavior around hub with radii ranging from 19.1 mm to 31.8 mm is studied both experimentally and through finite element simulations. Due to the thinness of the TRAC boom, a buckle appears in the inner flange, in the transition region from the fully deployed to the coiled configurations. Material failure is observed at this location, and this correlates well with stresses computed in simulation, coupled with the fiber microbuckling failure criterion. Reducing the thickness, either by changing the laminate or by improving the manufacturing process, is shown to reduce stresses, allowing coiling around smaller hubs without material failure.", "date": "2018-01-08", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-0690", "id_number": "CaltechAUTHORS:20190816-144340271", "isbn": "9781624105302", "book_title": "2018 AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144340271", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "other_numbering_system": { "items": [ { "id": "2018-0690", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2018-0690", "primary_object": { "basename": "Leclerc_Pedivellano_Pellegrino2018.pdf", "url": "https://authors.library.caltech.edu/records/rbm1k-p9p24/files/Leclerc_Pedivellano_Pellegrino2018.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Leclerc, Christophe; Pedivellano, Antonio; et el." }, { "id": "https://authors.library.caltech.edu/records/nbr40-fvc51", "eprint_id": 97657, "eprint_status": "archive", "datestamp": "2023-08-19 07:20:06", "lastmod": "2023-10-18 16:11:04", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultralight Ladder-type Coilable Space Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics. \n\nFinancial support from the Northrop Grumman Corporation is gratefully acknowledged.\n\nAccepted Version - Royer_and_Pellegrino_2018.pdf
", "abstract": "We describe the concept of an ultralight ladder-type coilable strip used as the main element to build large planar deployable space solar power spacecrafts. It is composed of TRAC longerons connected with lenticular cross-section rods which enables it to fully flatten and thus be packaged efficiently. The design is tackled here as well as the manufacturing of a scaled version of this new type of structures. Finite element analyses are used to understand the underlying behavior of such structures. Experimental model testing is then used as a way of validating this computational framework. Finally a simulation framework enabling simulation at the spacecraft scale is presented and preliminary results obtained with shows how such structures behave while integrated into a larger spacecraft.", "date": "2018-01-08", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-1200", "id_number": "CaltechAUTHORS:20190805-134838873", "isbn": "9781624105302", "book_title": "2018 AIAA Scitech Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838873", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2018-1200", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2018-1200", "primary_object": { "basename": "Royer_and_Pellegrino_2018.pdf", "url": "https://authors.library.caltech.edu/records/nbr40-fvc51/files/Royer_and_Pellegrino_2018.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Royer, Fabien and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/3hnnz-x3a61", "eprint_id": 97675, "eprint_status": "archive", "datestamp": "2023-08-19 07:12:44", "lastmod": "2023-10-20 21:49:27", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bosia-F", "name": { "family": "Bosia", "given": "Federico" }, "orcid": "0000-0002-2886-4519" }, { "id": "Schlothauer-A", "name": { "family": "Schlothauer", "given": "Arthur" } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Cure-induced deformation of ultra-thin composite laminates", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics. \n\nFinancial support from the Northrop Grumman Corporation is gratefully acknowledged. DSC experiments were performed in the Kornfield Lab at the California Institute of Technology: we thank Dr. T. Di Luccio and Mr. K. Ramachandran for helpful comments and discussions. The manufacturing and measurements of composite laminates were carried out at the Space Structure Laboratory at the California Institute\nof Technology. Numerical simulations were performed using COMPRO simulation software package for Abaqus, developed by Convergent Manufacturing Technologies.\n\nAccepted Version - Scitech2018_Bosi_Pellegrino_REVISED.pdf
", "abstract": "In fiber reinforced composite materials, the manufacturing process induces residual stresses and distortions that decrease the mechanical performance of the structure and affect its geometry, especially in thin laminates. Multi-physics simulations were performed to assess the spring-in effect in ultra-thin composite parabolic solar reflectors. For this purpose, a resin kinetic model has been developed by means of differential scanning calorimetry experiments. The kinetic relation has been implemented into the finite element software in order to correctly predict the evolution of the composite degree of cure during the manufacturing process. Specimens were produced in an autoclave and their final geometries were measured by means of a non-contact measuring system and compared with numerical predictions, showing very good agreement.", "date": "2018-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-2241", "id_number": "CaltechAUTHORS:20190806-133219697", "isbn": "978-1-62410-532-6", "book_title": "AIAA Scitech 2018 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190806-133219697", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2018-2241", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2018-2241", "primary_object": { "basename": "Scitech2018_Bosi_Pellegrino_REVISED.pdf", "url": "https://authors.library.caltech.edu/records/3hnnz-x3a61/files/Scitech2018_Bosi_Pellegrino_REVISED.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Bosia, Federico; Schlothauer, Arthur; et el." }, { "id": "https://authors.library.caltech.edu/records/z1x82-pdr59", "eprint_id": 97658, "eprint_status": "archive", "datestamp": "2023-08-19 07:12:39", "lastmod": "2023-10-18 16:11:07", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ferraro-S", "name": { "family": "Ferraro", "given": "S." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Self-Deployable Joints for Ultra-Light Space Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2018 American Institute of Aeronautics and Astronautics. \n\nThis work was supported by a NASA Space Technology Research Fellowship. S.F. would like to acknowledge Dr. William Doggett, NASA Langley, for mentoring and providing invaluable technical and scientific support.\n\nAccepted Version - ferraro2018.pdf
", "abstract": "The paper presents ongoing research and development of novel concepts for deployable space structures using self-latching, flexural joints to replace mechanical hinges. The mechanics of deformation of Fiber-Reinforced-Polymers (FRP) joints for in-plane deployment mechanisms are studied. Methods for characterizing these joints via experiments and numerical simulations are proposed. A failure criterion suitable for ultra-thin, plain-weave composites is used to predict failure of the joints and achieve a successful design.", "date": "2018-01", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2018-0694", "id_number": "CaltechAUTHORS:20190805-134838958", "isbn": "9781624105302", "book_title": "AIAA Scitech 2018 Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190805-134838958", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship" } ] }, "other_numbering_system": { "items": [ { "id": "2018-0694", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2018-0694", "primary_object": { "basename": "ferraro2018.pdf", "url": "https://authors.library.caltech.edu/records/z1x82-pdr59/files/ferraro2018.pdf" }, "resource_type": "book_section", "pub_year": "2018", "author_list": "Ferraro, S. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/2db4w-zg518", "eprint_id": 99856, "eprint_status": "archive", "datestamp": "2023-08-19 04:59:08", "lastmod": "2023-10-18 18:52:11", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bessa-M-A", "name": { "family": "Bessa", "given": "Miguel A." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Design of ultra-thin composite deployable shell structures through machine learning", "ispublished": "unpub", "full_text_status": "public", "keywords": "Buckling, ultra-thin composite shells, machine learning, data mining, data-driven computational framework, design", "note": "\u00a9 2017 by Miguel A. Bessa and Sergio Pellegrino. Published by the International Association for Shell and Spatial Structures (IASS) with permission. \n\nThe authors acknowledge financial support from the Northrop Grumman Corporation. Comments of an anonymous reviewer are gratefully acknowledged.\n\nPublished - MABessa_IASS17_MachineLearning_article_final.pdf
", "abstract": "A data-driven computational framework is applied for the design of optimal ultra-thin Triangular Rollable and Collapsible (TRAC) carbon fiber booms. High-fidelity computational analyses of a large number of geometries are used to build a database. This database is then analyzed by machine learning to construct design charts that are shown to effectively guide the design of the ultra-thin deployable structure. The computational strategy discussed herein is general and can be applied to different problems in structural and materials design, with the potential of finding relevant designs within high-dimensional spaces.", "date": "2017-09", "date_type": "published", "publisher": "HafenCity University", "id_number": "CaltechAUTHORS:20191114-160021163", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191114-160021163", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "contributors": { "items": [ { "id": "B\u00f6gle-A", "name": { "family": "B\u00f6gle", "given": "Annette" } }, { "id": "Grohmann-M", "name": { "family": "Grohmann", "given": "Manfred" } } ] }, "primary_object": { "basename": "MABessa_IASS17_MachineLearning_article_final.pdf", "url": "https://authors.library.caltech.edu/records/2db4w-zg518/files/MABessa_IASS17_MachineLearning_article_final.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Bessa, Miguel A. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/gnwhy-v4h70", "eprint_id": 99818, "eprint_status": "archive", "datestamp": "2023-08-19 04:59:04", "lastmod": "2023-10-18 18:50:06", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultra-Thin Composite Deployable Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2017 HafenCity University Hamburg & International Association of Shell & Spatial Structures (IASS).", "abstract": "Ultra-thin TRAC booms have many applications for spacecraft structures due to their very efficient packaging. A manufacturing process is proposed for composite TRAC booms with a total flange thickness of 71 \u03bcm. The mechanical behavior in both bending and torsion is studied through experiments.", "date": "2017-09", "date_type": "published", "publisher": "HafenCity University", "id_number": "CaltechAUTHORS:20191112-155802266", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191112-155802266", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "Space-Solar-Power-Project" }, { "id": "GALCIT" } ] }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Leclerc, Christophe and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/hd7br-x6z92", "eprint_id": 90772, "eprint_status": "archive", "datestamp": "2023-08-19 03:30:33", "lastmod": "2023-10-19 14:51:33", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Roy-T-A", "name": { "family": "Roy", "given": "Tatiana A." } }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Naqavi-A", "name": { "family": "Naqavi", "given": "Ali" } }, { "id": "Loke-S-P", "name": { "family": "Loke", "given": "Samuel P." } }, { "id": "Huang-Jing-Shun", "name": { "family": "Huang", "given": "Jing-Shun" }, "orcid": "0000-0002-7531-4691" }, { "id": "Vinogradova-T-G", "name": { "family": "Vinogradova", "given": "Tatiana G." } }, { "id": "Messer-A-J", "name": { "family": "Messer", "given": "Alexander J." } }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Gdoutos-E-E", "name": { "family": "Gdoutos", "given": "Eleftherios E." } }, { "id": "Royer-F", "name": { "family": "Royer", "given": "Fabien" } }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" } ] }, "title": "Design and Prototyping Efforts for the Space Solar Power Initiative", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "space solar power, concentrator photovoltaics, thermal management", "note": "\u00a9 2017 IEEE. \n\nWe acknowledge financial support from Northrop Grumman. This effort made use of facilities provided by the Kavli Nanoscience Institute, the Molecular Materials Research Center, the Resnick Institute, and the Joint Center for Artificial Photosynthesis at Caltech. We acknowledge the helpful contributions of Mark Kruer, Mike Levesque, and Erik Kurman at Northrop Grumman; Lynn Rodman at Nexolve; and Allen Smith at ABET.", "abstract": "The Space Solar Power Initiative (SSPI) seeks to enable reliable, cost-effective baseload power generation from large-scale solar power stations in space. We propose an ultralight, modular power station, having specific power in the range of 1\u201310 kW/kg for the photovoltaic (PV) collection subsystem. The building block of the power station is the 'tile,' a self-contained element that performs PV energy collection, conversion to radio frequency (RF), and transmission to earth. To minimize PV mass, we select a 1D, 10\u201320X parabolic trough concentrator geometry, which provides cooling and radiation shielding for the cells, and which folds flat for deployment. Here, we discuss the design, fabrication, and testing of the initial PV tile prototypes.", "date": "2017-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "558-561", "id_number": "CaltechAUTHORS:20181108-154443049", "isbn": "978-1-5090-5605-7", "book_title": "2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181108-154443049", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "local_group": { "items": [ { "id": "Kavli-Nanoscience-Institute" }, { "id": "Resnick-Sustainability-Institute" }, { "id": "JCAP" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/PVSC.2017.8366621", "resource_type": "book_section", "pub_year": "2017", "author_list": "Kelzenberg, Michael D.; Espinet-Gonz\u00e1lez, Pilar; et el." }, { "id": "https://authors.library.caltech.edu/records/g3erz-2jk31", "eprint_id": 90779, "eprint_status": "archive", "datestamp": "2023-08-19 03:30:41", "lastmod": "2023-10-19 14:52:12", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vinogradova-T-G", "name": { "family": "Vinogradova", "given": "Tatiana" } }, { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Messer-A-J", "name": { "family": "Messer", "given": "Alexander" } }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Peterson-C", "name": { "family": "Peterson", "given": "Chris" } }, { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Naqavi-A", "name": { "family": "Naqavi", "given": "Ali" } }, { "id": "Huang-Jing-Shun", "name": { "family": "Huang", "given": "Jing-Shun" }, "orcid": "0000-0002-7531-4691" }, { "id": "Loke-S-P", "name": { "family": "Loke", "given": "Samuel P." } }, { "id": "Walker-D", "name": { "family": "Walker", "given": "Don" } }, { "id": "Mann-C-J", "name": { "family": "Mann", "given": "Colin J." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" } ] }, "title": "Impact of Space Radiation Environment on Concentrator Photovoltaic Systems", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "Concentrator photovoltaic systems, concentrator solar cells, space radiation modeling, radiation tests, space solar power, shielding", "note": "\u00a9 2017 IEEE. \n\nWe acknowledge financial support from Northrop Grumman. This effort made use of facilities provided by the Kavli Nanoscience Institute, the Material Molecular Research Center (MMRC), the Resnick Institute, and the Joint Center for Artificial Photosynthesis, at Caltech.", "abstract": "Concentrator photovoltaic systems can provide supplementary shielding against high energy particles. In this paper we compare the radiation environment that the same solar cell would experience in a flat-plate module versus in a parabolic mirror concentrator system. We have observed that the shielding provided by the concentrator system is remarkable. In order to obtain an accurate prediction of the overall shield needed in our concentrator system triple-junction space solar cells have been irradiated on the edge with 350-keV protons at a fluence of 10^(12) p^+cm^(-2). A mild degradation of the open circuit voltage was measured (~70 mV).", "date": "2017-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "512-516", "id_number": "CaltechAUTHORS:20181109-074226646", "isbn": "978-1-5090-5605-7", "book_title": "2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181109-074226646", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "collection": "CaltechAUTHORS", "local_group": { "items": [ { "id": "Kavli-Nanoscience-Institute", "value": "Kavli Nanoscience Institute" }, { "id": "Resnick-Sustainability-Institute", "value": "Resnick Sustainability Institute" }, { "id": "JCAP", "value": "JCAP" }, { "id": "Space-Solar-Power-Project", "value": "Space Solar Power Project" } ] }, "doi": "10.1109/PVSC.2017.8366020", "resource_type": "book_section", "pub_year": "2017", "author_list": "Espinet-Gonz\u00e1lez, Pilar; Vinogradova, Tatiana; et el." }, { "id": "https://authors.library.caltech.edu/records/0xnyf-zv194", "eprint_id": 90780, "eprint_status": "archive", "datestamp": "2023-08-19 03:30:51", "lastmod": "2023-10-19 14:52:18", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vinogradova-T-G", "name": { "family": "Vinogradova", "given": "Tatiana G." } }, { "id": "Huang-Jing-Shun", "name": { "family": "Huang", "given": "Jing-Shun" }, "orcid": "0000-0002-7531-4691" }, { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Naqavi-A", "name": { "family": "Naqavi", "given": "Ali" } }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" } ] }, "title": "Lightweight Carbon Fiber Mirrors for Solar Concentrator Applications", "ispublished": "unpub", "full_text_status": "public", "keywords": "mirrors, solar energy, optical device fabrication, polymers, ray tracing, space solar, optical design", "note": "\u00a9 2017 IEEE. \n\nWe acknowledge funding from Northrop Grumman Corporation. This effort made use of facilities provided by the Kavli Nanoscience Institute, the Molecular Materials Research Center, the Resnick Institute, and the Joint Center for Artificial Photosynthesis at Caltech. We acknowledge the helpful contributions of Mark Kruer, Mike Levesque, and Erik Kurman at Northrop Grumman.\n\nSubmitted - 1810.09529.pdf
", "abstract": "Lightweight parabolic mirrors for solar concentrators have been fabricated using carbon fiber reinforced polymer (CFRP) and a nanometer scale optical surface smoothing technique. The smoothing technique improved the surface roughness of the CFRP surface from ~3 \u03bcm root mean square (RMS) for as-cast to ~5 nm RMS after smoothing. The surfaces were then coated with metal, which retained the sub-wavelength surface roughness, to produce a high-quality specular reflector. The mirrors were tested in an 11x geometrical concentrator configuration and achieved an optical efficiency of 78% under an AM0 solar simulator. With further development, lightweight CFRP mirrors will enable dramatic improvements in the specific power, power per unit mass, achievable for concentrated photovoltaics in space.", "date": "2017-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "572-577", "id_number": "CaltechAUTHORS:20181109-075349019", "isbn": "978-1-5090-5605-7", "book_title": "2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181109-075349019", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "local_group": { "items": [ { "id": "Kavli-Nanoscience-Institute" }, { "id": "Resnick-Sustainability-Institute" }, { "id": "JCAP" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.48550/arXiv.1810.09529", "primary_object": { "basename": "1810.09529.pdf", "url": "https://authors.library.caltech.edu/records/0xnyf-zv194/files/1810.09529.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Vaidya, Nina; Kelzenberg, Michael D.; et el." }, { "id": "https://authors.library.caltech.edu/records/xzx6p-ems21", "eprint_id": 90783, "eprint_status": "archive", "datestamp": "2023-08-19 03:31:07", "lastmod": "2023-10-19 14:52:27", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Naqavi-A", "name": { "family": "Naqavi", "given": "Ali" } }, { "id": "Loke-S-P", "name": { "family": "Loke", "given": "Samuel P." } }, { "id": "Kelzenberg-M-D", "name": { "family": "Kelzenberg", "given": "Michael D." }, "orcid": "0000-0002-6249-2827" }, { "id": "Warmann-E-C", "name": { "family": "Warmann", "given": "Emily C." }, "orcid": "0000-0002-2810-4608" }, { "id": "Espinet-Gonz\u00e1lez-P", "name": { "family": "Espinet-Gonz\u00e1lez", "given": "Pilar" }, "orcid": "0000-0002-7656-0077" }, { "id": "Vaidya-N", "name": { "family": "Vaidya", "given": "Nina" } }, { "id": "Huang-Jing-Shun", "name": { "family": "Huang", "given": "Jing-Shun" }, "orcid": "0000-0002-7531-4691" }, { "id": "Roy-T-A", "name": { "family": "Roy", "given": "Tatiana A." } }, { "id": "Messer-A-J", "name": { "family": "Messer", "given": "Alexander J." } }, { "id": "Vinogradova-T-G", "name": { "family": "Vinogradova", "given": "Tatiana G." } }, { "id": "Hajimiri-A", "name": { "family": "Hajimiri", "given": "Ali" }, "orcid": "0000-0001-6736-8019" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Atwater-H-A", "name": { "family": "Atwater", "given": "Harry A." }, "orcid": "0000-0001-9435-0201" } ] }, "title": "Near-unity ultra-wideband thermal infrared emission for space solar power radiative cooling", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "thermal radiation, radiative cooling, vibrons, polaritons, space solar power", "note": "\u00a9 2017 IEEE. \n\nWe acknowledge financial support from the Northrop Grumman Corporation. A.N. is supported from the Swiss Science National Foundation. The authors acknowledge Mark Kruer of Northrop Grumman Corporation for help in characterization of samples, Tom Tiwald of J. A. Woollam Co. for analyzing the ellipsometry measurements of the polyimide layers, and Lynn Rodman of Nexolve for providing materials and guidance in fabricating the thin polyimide layers.", "abstract": "We report the design, fabrication and characterization of ultrathin metasurfaces that exhibit wideband 300 K thermal emissivity. The emissive behavior of these structures is almost independent of the emission angle. Our ultralight subwavelength-thickness metasurfaces can be fabricated relatively easily and are excellent candidates for radiative cooling in space applications.", "date": "2017-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "521-524", "id_number": "CaltechAUTHORS:20181109-081714215", "isbn": "978-1-5090-5605-7", "book_title": "2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20181109-081714215", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Swiss National Science Foundation (SNSF)" } ] }, "local_group": { "items": [ { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/PVSC.2017.8366597", "resource_type": "book_section", "pub_year": "2017", "author_list": "Naqavi, Ali; Loke, Samuel P.; et el." }, { "id": "https://authors.library.caltech.edu/records/2jq6j-xh523", "eprint_id": 78719, "eprint_status": "archive", "datestamp": "2023-08-19 03:22:27", "lastmod": "2023-10-26 00:19:36", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Goel-Ashish", "name": { "family": "Goel", "given": "Ashish" } }, { "id": "Chung-Soon-Jo", "name": { "family": "Chung", "given": "Soon-Jo" }, "orcid": "0000-0002-6657-3907" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Trajectory Design of a Spacecraft Formation for Space-Based Solar Power Using Sequential Convex Programming", "ispublished": "unpub", "full_text_status": "public", "note": "The authors thank Northrop Grumman Corporation for supporting this project. We also thank all other members of the SSPI team at Caltech for their valuable inputs.\n\nPublished - IWSCFF_SPI.pdf
", "abstract": "The concept of collecting solar power in space and transmitting it to the Earth using microwaves has been studied by numerous researchers in the past. The Space Solar Power Initiative (SSPI) at Caltech is a collaborative project to bring about the scientific and technological innovations necessary for enabling a space-based solar power system. The proposed system comprises an array of ultra-light, membrane-like deployable modules with high efficiency photovoltaic (PV) concentrators and microwave transmission antennas embedded in the structure. Each module is 60m x 60m in size and in the final configuration, hundreds of these modules span a 3km x 3km array in a geosynchronous orbit. As this formation goes around the Earth, the orientation and position of each module has to be changed so as to optimize the angle made by the photovoltaic surface with respect to the sun and by the antenna surface with respect to the receiving station on Earth. In order to achieve high antenna array efficiency, the modules have to remain in a tight formation with an edge-to-edge distance on the order of a few meters. In addition, the modules also have to avoid collisions and maintain a planar configuration to avoid the possibility of both PV and RF shadowing. In this paper, we present the trajectory design that achieves the dual goal of minimizing the propellant usage and maximizing the power delivered to the ground station, while meeting the various orbital constraints. The optimal control problem is solved using sequential convex programming for a 4 x 4 formation and the results obtained show that it is possible to maintain the formation for 11 years in a geo-synchronous orbit with relatively small amounts of propellant. This serves as a critical achievement in the path towards realizing the objective of space-based solar power.", "date": "2017-06", "date_type": "published", "publisher": "Caltech Library", "id_number": "CaltechAUTHORS:20170630-094657577", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170630-094657577", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "17-43", "name": "IWSCFF" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "primary_object": { "basename": "IWSCFF_SPI.pdf", "url": "https://authors.library.caltech.edu/records/2jq6j-xh523/files/IWSCFF_SPI.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Goel, Ashish; Chung, Soon-Jo; et el." }, { "id": "https://authors.library.caltech.edu/records/v0wpe-pk203", "eprint_id": 78224, "eprint_status": "archive", "datestamp": "2023-08-19 01:50:42", "lastmod": "2023-10-25 23:53:48", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Goel-Ashish", "name": { "family": "Goel", "given": "Ashish" } }, { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Trajectory design of formation flying constellation for space-based solar power", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2017 IEEE. \n\nThe authors thank Northrop Grumman Corporation for supporting this project. We also thank all other members of the SSPI team at Caltech for their valuable inputs. Inputs from Dr. Daniel Scharf were very useful in the design of the periodic relative orbits. Nicolas Lee was supported during this work by a postdoctoral fellowship from the W. M. Keck Institute for Space Studies.", "abstract": "The concept of collecting solar power in space and transmitting it to the Earth using a microwave beam has appealed to the imagination of numerous researchers in the past. The Space Solar Power Initiative at Caltech is working towards turning this idea into reality, by developing the critical technologies necessary to make this an economically feasible solution. The proposed system comprises an array of ultralight, membrane-like deployable modules with high efficiency photovoltaics and microwave transmission antennas embedded in the structure. Each module is 60 m \u03c7 60 m in size and in the final configuration, \u223c2500 of these modules form a 3 km \u03c7 3 km array in a geosynchronous orbit. As the constellation orbits the Earth, the orientation and position of each module has to be changed so as to optimize the angle made by the photovoltaic surface with respect to the sun and by the antenna surface with respect to the receiving station on Earth. We derive the optimum orientation profile for the modules and find that modules with dual-sided RF transmission can provide 1.5 times more orbit-averaged power than modules with single-sided RF transmission. To carry out the corresponding orbital maneuvers, an optimization framework using the Hill-Clohessy-Wiltshire (HCW) equations is developed to achieve the dual goal of maximizing the power delivered, while minimizing the propellant required to carry out the desired orbital maneuvers. Results are presented for a constellation with modules in fixed relative positions and also for a constellation where the modules execute circularized periodic relative motion in the HCW frame. We show that the use of these periodic relative orbits reduces the propellant consumption from \u223c150 kg to \u223c50 kg. This drastic reduction makes the propellant mass a significantly smaller fraction of the module's dry mass (370 kg), thereby solving a major technical hurdle in the realization of space-based solar power.", "date": "2017-03", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1-11", "id_number": "CaltechAUTHORS:20170614-164611614", "isbn": "978-1-5090-1613-6", "book_title": "2017 IEEE Aerospace Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170614-164611614", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.1109/AERO.2017.7943711", "resource_type": "book_section", "pub_year": "2017", "author_list": "Goel, Ashish; Lee, Nicolas; et el." }, { "id": "https://authors.library.caltech.edu/records/ggqk7-nj973", "eprint_id": 97973, "eprint_status": "archive", "datestamp": "2023-08-19 01:02:01", "lastmod": "2023-10-18 16:55:44", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Leclerc-C", "name": { "family": "Leclerc", "given": "Christophe" } }, { "id": "Wilson-L-L", "name": { "family": "Wilson", "given": "Lee" } }, { "id": "Bessa-M-A", "name": { "family": "Bessa", "given": "Miguel A." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Characterization of Ultra-Thin Composite Triangular Rollable and Collapsible Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2017 American Institute of Aeronautics and Astronautics. \n\nThe authors acknowledge financial support from the Northrop Grumman Corporation, the Keck Institute for Space Studies and the Natural Sciences and Engineering Research Council of Canada.\n\nAccepted Version - LECLERC_Characterization-Ultra-ThinSMALL.pdf
", "abstract": "The paper studies the behavior of Triangular Rollable and Collapsible (TRAC) booms made from ultra-thin carbon fiber, with a total flange thickness of 71 \u00b5m. Both bending and torsional behavior of the deployed booms are studied using numerical analysis and experimental testing. The coiling of the booms around hubs of large radius is also studied.", "date": "2017-01-09", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2017-0172", "id_number": "CaltechAUTHORS:20190816-144341170", "isbn": "9781624104558", "book_title": "AIAA SciTech Forum : 4th AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341170", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Keck Institute for Space Studies (KISS)" }, { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" } ] }, "other_numbering_system": { "items": [ { "id": "2017-0172", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2017-0172", "primary_object": { "basename": "LECLERC_Characterization-Ultra-ThinSMALL.pdf", "url": "https://authors.library.caltech.edu/records/ggqk7-nj973/files/LECLERC_Characterization-Ultra-ThinSMALL.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Leclerc, Christophe; Wilson, Lee; et el." }, { "id": "https://authors.library.caltech.edu/records/yy02s-zf342", "eprint_id": 98051, "eprint_status": "archive", "datestamp": "2023-08-19 01:00:22", "lastmod": "2023-10-18 16:59:55", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Talon-T", "name": { "family": "Talon", "given": "T." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "In-space Shape Measurement of Large Planar Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2017 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2017. \n\nThis research was supported by the Northrop Grumman Corporation.\n\nAccepted Version - TalonAIAA2017.pdf
", "abstract": "A measurement and integration scheme is proposed to estimate the shape of a large planar structure in space. Lightweight sun sensors distributed on the structure measure the local angles relative to the sun. A reconstruction technique is introduced to estimate the shape of the satellite through a decomposition on a function basis. The estimated shape is determined by the coefficients associated with the basis functions which are calculated from the measurements. A trade-study to analyze the influence of different reconstruction schemes and the position of the sensors is presented. An optimization scheme minimizes the RMS error between the estimated and true shape. An experiment was conducted to show the feasibility and performance of the proposed system at the lab scale. Finally, a simulation of the accuracy of the presented solution on a 60 m space solar power module is performed. The expected error is 0.7 mm RMS using sensors every 30 cm.", "date": "2017-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2017-1116", "id_number": "CaltechAUTHORS:20190820-154603282", "isbn": "978-1-62410-455-8", "book_title": "4th AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190820-154603282", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2017-1116", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2017-1116", "primary_object": { "basename": "TalonAIAA2017.pdf", "url": "https://authors.library.caltech.edu/records/yy02s-zf342/files/TalonAIAA2017.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Talon, T. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/81rdd-jhj56", "eprint_id": 98092, "eprint_status": "archive", "datestamp": "2023-08-19 01:00:25", "lastmod": "2023-10-18 17:02:12", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wei-Yuchen", "name": { "family": "Wei", "given": "Yuchen" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Modular Foldable Surfaces: a Novel Approach based on Spatial Mechanisms and Thin Shells", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2017 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2017.", "abstract": "This paper investigates a set of novel techniques that lead to modular, deployable surface arrays which could be either flat or curved in their deployed shape. The two components of the proposed concepts are thin shells with smooth folds and spatial mechanisms with rolling hinges. Kinematics of the mechanism and motion of the shell has been shown to be fully compatible with each other during folding and unfolding. This basic module is then articulated to create multiple modular tessellations, which form a series of foldable surfaces. We further demonstrate that curvature could be introduced to the initially flat shells using bonded piezoceramic actuators. The techniques and concepts proposed in this paper could be valuable for the design of future deployable space-based telescope and other reflective arrays which require high shape precision with low storage area and volume.", "date": "2017-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2017-1345", "id_number": "CaltechAUTHORS:20190821-155916295", "isbn": "978-1-62410-455-8", "book_title": "4th AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190821-155916295", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2017-1345", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2017-1345", "resource_type": "book_section", "pub_year": "2017", "author_list": "Wei, Yuchen and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/mjp70-gt490", "eprint_id": 98049, "eprint_status": "archive", "datestamp": "2023-08-19 01:00:17", "lastmod": "2023-10-18 16:59:50", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Umali-J-A", "name": { "family": "Umali", "given": "James" } }, { "id": "Wilson-L-L", "name": { "family": "Wilson", "given": "Lee" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Vibration Response of Ultralight Coilable Spacecraft Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2017 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 5 Jan 2017. \n\nFinancial support from Northrop Grumman Corporation is gratefully acknowledged.\n\nAccepted Version - Umali+SciTech_Paper.pdf
", "abstract": "Dynamic assessment of ultralight wrapped spacecraft structures subject to the launch vibration environment is difficult, and has been foregone in many space programs in favor of purely experimental test campaigns. We present a numerical methodology to better understand the wrapped state of a structure and the dynamic behavior during launch vibration, enabling higher confidence in its survivability and greater understanding of the dynamic behavior at different scales, which vibration test approaches alone cannot achieve.", "date": "2017-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2017-1115", "id_number": "CaltechAUTHORS:20190820-152401055", "isbn": "978-1-62410-455-8", "book_title": "4th AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190820-152401055", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2017-1115", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2017-1115", "primary_object": { "basename": "Umali+SciTech_Paper.pdf", "url": "https://authors.library.caltech.edu/records/mjp70-gt490/files/Umali+SciTech_Paper.pdf" }, "resource_type": "book_section", "pub_year": "2017", "author_list": "Umali, James; Wilson, Lee; et el." }, { "id": "https://authors.library.caltech.edu/records/h6fhh-w7991", "eprint_id": 70657, "eprint_status": "archive", "datestamp": "2023-08-20 13:01:40", "lastmod": "2024-01-13 16:53:53", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jackson-K", "name": { "family": "Jackson", "given": "Kate" } }, { "id": "Wallace-J-K", "name": { "family": "Wallace", "given": "J. K." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Co-phasing primary mirror segments of an optical space telescope using a long stroke Zernike WFS", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).\n\nThis work was funded in part by the Spontaneous Research and Technology Development fund at the Jet Propulsion Laboratory. This work was partially carried out by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.\n\nPublished - 99046D.pdf
", "abstract": "Static Zernike phase-contrast plates have been used extensively in microscopy for half a century and, more recently, in optical telescopes for wavefront sensing. A dynamic Zernike wavefront sensor (WFS) with four phase shifts, for reducing error due to spurious light and eliminating other asynchronous noise, has been proposed for use in adaptive optics. Here, we propose adapting this method for co-phasing the primary mirror of a segmented space telescope. In order to extend the dynamic range of the WFS, which has a maximum range of +/ \u2212 \u03bb/2, a phase- contrast plate with multiple steps, both positive and negative, has been developed such that errors as large as +/ \u2212 10\u03bb can be sensed. The manufacturing tolerances have been incorporated into simulations, which demonstrate that performance impacts are minimal. We show that the addition of this small optical plate along with a high precision linear translation stage at the prime focus of a telescope and pupil viewing capability can provide extremely accurate segment phasing with a simple white-light fringe fitting algorithm and a closed-loop controller. The original focal-plane geometry of a centro-symmetric phase shifting element is replaced with a much less constrained shape, such as a slot. Also, a dedicated pupil imager is not strictly required; an existing pupil sampler such as a Shack-Hartmann (SH) WFS can be used just as effectively, allowing simultaneous detection of wavefront errors using both intensity and spot positions on the SH-WFS. This could lead to an efficient synergy between Zernike and SH-WFS, enabling segment phasing in conjunction with high-dynamic range sensing.", "date": "2016-07-29", "date_type": "published", "publisher": "Society of Photo-Optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 99046D", "id_number": "CaltechAUTHORS:20160929-095806840", "isbn": "9781510601871", "book_title": "Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160929-095806840", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "JPL Research and Technology Development Fund" }, { "agency": "NASA/JPL/Caltech" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "MacEwen-H-A", "name": { "family": "MacEwen", "given": "Howard A." } }, { "id": "Fazio-G-G", "name": { "family": "Fazio", "given": "Giovanni G." } }, { "id": "Lystrup-M", "name": { "family": "Lystrup", "given": "Makenzie" } }, { "id": "Batalha-N-M", "name": { "family": "Batalha", "given": "Natalie" } }, { "id": "Siegler-N", "name": { "family": "Siegler", "given": "Nick" } }, { "id": "Tong-Edward-C", "name": { "family": "Tong", "given": "Edward C." } } ] }, "doi": "10.1117/12.2249638", "primary_object": { "basename": "99046D.pdf", "url": "https://authors.library.caltech.edu/records/h6fhh-w7991/files/99046D.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Jackson, Kate; Wallace, J. K.; et el." }, { "id": "https://authors.library.caltech.edu/records/3dasg-wte70", "eprint_id": 70658, "eprint_status": "archive", "datestamp": "2023-08-20 12:56:56", "lastmod": "2023-10-20 23:18:17", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Steeves-J", "name": { "family": "Steeves", "given": "John" } }, { "id": "Jackson-K", "name": { "family": "Jackson", "given": "Kathryn" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Redding-D", "name": { "family": "Redding", "given": "David" } }, { "id": "Wallace-J-K", "name": { "family": "Wallace", "given": "J. Kent" } }, { "id": "Bradford-S-C", "name": { "family": "Bradford", "given": "Samuel Case" } }, { "id": "Barbee-T", "name": { "family": "Barbee", "given": "Troy" } } ] }, "title": "Multilayer Active Shell Mirrors for Space Telescopes", "ispublished": "unpub", "full_text_status": "public", "keywords": "Active Mirrors, CFRP, Nanolaminate, Replication, Reverse Hartmann", "note": "\u00a9 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nA part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology under a contract with the National Aeronautics and Space Administration (NASA).\n\nPublished - 99121K.pdf
", "abstract": "A novel active mirror technology based on carbon fiber reinforced polymer (CFRP) substrates and replication techniques has been developed. Multiple additional layers are implemented into the design serving various functions. Nanolaminate metal films are used to provide a high quality reflective front surface. A backing layer of thin active material is implemented to provide the surface-parallel actuation scheme. Printed electronics are used to create a custom electrode pattern and flexible routing layer. Mirrors of this design are thin (< 1.0 mm), lightweight (2.7 kg/m^2), and have large actuation capabilities. These capabilities, along with the associated manufacturing processes, represent a significant change in design compared to traditional optics. Such mirrors could be used as lightweight primaries for small CubeSat-based telescopes or as meter-class segments for future large aperture observatories. Multiple mirrors can be produced under identical conditions enabling a substantial reduction in manufacturing cost and complexity. \n\nAn overview of the mirror design and manufacturing processes is presented. Predictions on the actuation performance have been made through finite element simulations demonstrating correctabilities on the order of 250-300\u00d7 for astigmatic modes with only 41 independent actuators. A description of the custom metrology system used to characterize the active mirrors is also presented. The system is based on a Reverse Hartmann test and can accommodate extremely large deviations in mirror figure (> 100 \u03bcm PV) down to sub-micron precision. The system has been validated against several traditional techniques including photogrammetry and interferometry. The mirror performance has been characterized using this system, as well as closed-loop figure correction experiments on 150 mm dia. prototypes. The mirrors have demonstrated post-correction figure accuracies of 200 nm RMS (two dead actuators limiting performance).", "date": "2016-07-22", "date_type": "published", "publisher": "Society of Photo-Optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 99121K", "id_number": "CaltechAUTHORS:20160929-102853368", "isbn": "9781510602038", "book_title": "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160929-102853368", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL/Caltech" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Navarro-R", "name": { "family": "Navarro", "given": "Ram\u00f3n" } }, { "id": "Burge-J-H", "name": { "family": "Burge", "given": "James H." } } ] }, "doi": "10.1117/12.2233594", "primary_object": { "basename": "99121K.pdf", "url": "https://authors.library.caltech.edu/records/3dasg-wte70/files/99121K.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Steeves, John; Jackson, Kathryn; et el." }, { "id": "https://authors.library.caltech.edu/records/t4k67-kbw24", "eprint_id": 98104, "eprint_status": "archive", "datestamp": "2023-08-20 12:57:13", "lastmod": "2023-10-18 17:03:19", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Costantino-A-M", "name": { "family": "Costantino", "given": "Adrian M." } }, { "id": "Narsai-P-S", "name": { "family": "Narsai", "given": "Pavan S." } }, { "id": "Cantwell-B-J", "name": { "family": "Cantwell", "given": "Brian J." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Nondestructive Mapping of Hybrid Rocket Fuel Grains", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2016 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 22 Jul 2016. \n\nA. M. Costantino would like to thank the Summer Undergraduate Research Fellowship (SURF) with the aid of the donation from Mary P. and Dean C. Daily and funding from the Stanford aerospace and Astronautics Department. I also thank Stanford graduate student Pavan Narsai who guided and assisted me in my research over the course of the program as well as Javier Stober and Alexandra Ilic for their help in machining parts of the measuring device.", "abstract": "The regression rates of solid fuels used in hybrid rocket motors are a critical parameter in the design and development of hybrid propulsion systems. Currently, it is difficult to measure fuel geometries accurately, thus causing difficulties in accurately describing regression rates, especially for smaller scale systems. Nondestructive techniques can solve this problem, as it is not necessary to get tooling into the ports. An apparatus that maps the fuel grain employing an immersed ultrasound transducer has been manufactured; its results will be the primary focus of this study. The full geometry of the fuel grains can be generated pre and post fire, which may lead to greater understanding of the way hybrid rocket fuels burn. Furthermore, previously undetectable defects, such as cracks and voids, may be identified. The study found that the method used to cast the fuel grains, spin casting causes thinning in wall thickness on average of 11.3% with a standard deviation of 1.2% from the end to the middle of the fuel grain. The generated data can further validate proposed analytical solutions (Cantwell, 2014) to the regression rate equations (Marxman and Gilbert, 1963) associated with hybrid rocket propulsion systems.", "date": "2016-07-22", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2016-4866", "id_number": "CaltechAUTHORS:20190822-102905667", "isbn": "978-1-62410-406-0", "book_title": "52nd AIAA/SAE/ASEE Joint Propulsion Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-102905667", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech Summer Undergraduate Research Fellowship (SURF)" }, { "agency": "Mary P. and Dean C. Daily" }, { "agency": "Stanford University" } ] }, "other_numbering_system": { "items": [ { "id": "2016-4866", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2016-4866", "resource_type": "book_section", "pub_year": "2016", "author_list": "Costantino, Adrian M.; Narsai, Pavan S.; et el." }, { "id": "https://authors.library.caltech.edu/records/bx7wm-dcm31", "eprint_id": 98289, "eprint_status": "archive", "datestamp": "2023-08-20 09:51:05", "lastmod": "2023-10-18 17:13:22", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Sakovsky-M", "name": { "family": "Sakovsky", "given": "M." }, "orcid": "0000-0002-3683-8505" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Mallikarachchi-H-M-Y-C", "name": { "family": "Mallikarachchi", "given": "H. M. Y. C." } } ] }, "title": "Folding and Deployment of Closed Cross-Section Dual-Matrix Composite Booms", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2016 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 1 Jan 2016. \n\nThis research was supported by the AFOSR (award no. FA9550-13-1-0061, program manager Dr David Stargel).\n\nAccepted Version - sakovsky_et_al_2016.pdf
", "abstract": "A dual-matrix composite boom is proposed as a way of realizing a deployable closed cross-section boom that is stiff, lightweight, and can be packaged in small volumes. Little work exists studying the folding and deployment behavior of closed cross-section boom made of composite shells and this paper addresses this by investigating the behavior for two closed cross-section designs. Experimental techniques for measuring the folded shape of curved shells undergoing large deformations is presented. Furthermore, experimental measurements of the moment-rotation response of the two booms are discussed. A study using commercially available finite element software yields simulation techniques for successfully\npredicting the folded shape of closed-cross section booms. The drawbacks of the software when predicting the moment-rotation response are addressed. The application of these techniques for the chosen designs demonstrate that dual-matrix booms are a promising alternative to existing composite deployable booms.", "date": "2016-01-01", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2016-0970", "id_number": "CaltechAUTHORS:20190828-095135682", "isbn": "978-1-62410-394-0", "book_title": "3rd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190828-095135682", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "FA9550-13-1-0061" } ] }, "other_numbering_system": { "items": [ { "id": "2016-0970", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2016-0970", "primary_object": { "basename": "sakovsky_et_al_2016.pdf", "url": "https://authors.library.caltech.edu/records/bx7wm-dcm31/files/sakovsky_et_al_2016.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Sakovsky, M.; Pellegrino, S.; et el." }, { "id": "https://authors.library.caltech.edu/records/5b04a-92x39", "eprint_id": 70244, "eprint_status": "archive", "datestamp": "2023-08-20 09:46:38", "lastmod": "2023-10-20 21:59:13", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gupta-A", "name": { "family": "Gupta", "given": "Arjun" } }, { "id": "Costantine-J", "name": { "family": "Costantine", "given": "J." } }, { "id": "Tawk-Y", "name": { "family": "Tawk", "given": "Y." } }, { "id": "Christodoulou-C-G", "name": { "family": "Christodoulou", "given": "Christos G." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Sakovsky-M", "name": { "family": "Sakovsky", "given": "M." }, "orcid": "0000-0002-3683-8505" } ] }, "title": "A Deployable Vivaldi-fed Conical Horn Antenna for CubeSats", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2016 IEEE. \n\nDate Added to IEEE Xplore: 21 March 2016.", "abstract": "The advent of CubeSats has revolutionized the space research industry. The small physical size and constraints owing to outer space applications present significant challenges for antenna engineers to come up with innovative solutions. This paper presents a novel wide band antenna high gain antenna which is capable of deploying from a CubeSat platform.", "date": "2016-01", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1-2", "id_number": "CaltechAUTHORS:20160909-112312357", "isbn": "978-1-4673-8678-4", "book_title": "2016 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160909-112312357", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1109/USNC-URSI-NRSM.2016.7436244", "resource_type": "book_section", "pub_year": "2016", "author_list": "Gupta, Arjun; Costantine, J.; et el." }, { "id": "https://authors.library.caltech.edu/records/j5bad-hx679", "eprint_id": 70700, "eprint_status": "archive", "datestamp": "2023-08-20 09:46:53", "lastmod": "2023-10-20 23:21:17", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Delapierre-M", "name": { "family": "Delapierre", "given": "M." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Membrane Spin Up in a Normal Gravity Field: Experiments and Simulations", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2016 AIAA. \n\nWe thank Professor Sigrid Leyendecker and Tristan Schlogl for helpful discussions and advice. Financial support from the Northrop Grumman Corporation is gratefully acknowledged.\n\nSubmitted - Membrane_spinup_SciTech2016_NEW.pdf
", "abstract": "Finite element simulations and experimental observations of the spin up in vacuum of a thin membrane loaded by gravity are presented. The numerical techniques take into account the run time of each simulation and energy convergence; it is shown that accurate results can be obtained quite quickly in a rotating reference frame, and that including stiffness-proportional material damping helps convergence of the integration. It is also found that a very fine finite element mesh around the hub of the membrane is required to obtain consistent results. The experimental setup allows spinning of the membrane in a vacuum box; a measurement technique that uses stereo Digital Image Correlation is presented. A comparison between experiments and simulations using characteristic parameters of the shape of a membrane, i.e. the number of rotational symmetric waves, the average deflection, and the elastic bending strain energy of the membrane, shows good agreement between experiments and simulations.", "date": "2016-01", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2016-1216", "id_number": "CaltechAUTHORS:20160930-131912958", "isbn": "978-1-62410-394-0", "book_title": "3rd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160930-131912958", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2016-1216", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2016-1216", "primary_object": { "basename": "Membrane_spinup_SciTech2016_NEW.pdf", "url": "https://authors.library.caltech.edu/records/j5bad-hx679/files/Membrane_spinup_SciTech2016_NEW.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Delapierre, M. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/5zrfw-nhx55", "eprint_id": 70701, "eprint_status": "archive", "datestamp": "2023-08-20 09:46:57", "lastmod": "2023-10-20 23:21:21", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hogstrom-K", "name": { "family": "Hogstrom", "given": "Kristina" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Methods for Characterizing the Reliability of Deployable Modules for Large Optical Reflectors", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2016 AIAA. \n\nThis work was supported by the NASA Space Technology Research Fellowship #NNX13AL67H, with the help and mentorship of Erik Komendera, John Dorsey, and Bill Doggett at NASA Langley Research Center and Stuart Shaklan at the Jet Propulsion Laboratory. Many thanks to Isabelle Phinney for her help with setting up experiments.\n\nSubmitted - Scitech_paper.pdf
", "abstract": "The In-Space Telescope Assembly Robotics (ISTAR) project has proposed an architecture for a large robotically-assembled telescope in space, comprised of many deployable truss modules. The truss modules are based on the Pactruss deployment scheme and are equipped with Rolamite tape spring hinges. Fabrication and assembly errors that arise from bulk manufacturing the modules may make the deployment unreliable. A simulation toolkit has been developed to characterize the deployment behavior of the module in the presence of such errors. This paper first outlines the details of the toolkit, including the truss model, the Rolamite hinge model, and the simulation methodology. It then describes the experiment designed to validate the toolkit. A module was constructed and deployed while tracking the displacements of a select node and the rotations of the Rolamite hinges. The measured shape of this module was recreated in the simulation model and the same parameters were obtained. It was found that the experimental and simulated nodal displacements matched within 10%. The experimental hinge behavior was generally captured in the simulation, with some discrepancies in the latching of one hinge. The possible causes for the discrepancies and ongoing work to improve the results are discussed in the paper.", "date": "2016-01", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2016-2164", "id_number": "CaltechAUTHORS:20160930-132028713", "isbn": "978-1-62410-394-0", "book_title": "3rd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160930-132028713", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA Space Technology Research Fellowship", "grant_number": "NNX13AL67H" } ] }, "other_numbering_system": { "items": [ { "id": "AIAA 2016-2164", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2016-2164", "primary_object": { "basename": "Scitech_paper.pdf", "url": "https://authors.library.caltech.edu/records/5zrfw-nhx55/files/Scitech_paper.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Hogstrom, Kristina and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/k6xmf-g5p42", "eprint_id": 70699, "eprint_status": "archive", "datestamp": "2023-08-20 09:46:49", "lastmod": "2023-10-20 23:21:14", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arya-M", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultralight Structures for Space Solar Power Satellites", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2016 AIAA. \n\nFinancial support from Northrop Grumman Corporation is gratefully acknowledged. The research presented in this paper was carried out in collaboration with Professors Harry Atwater and Ali Hajimiri and their research groups. Drs. Dennis Callahan and Florian Bohn helped with the design and the construction of the tile mockup.\n\nSubmitted - 2016_sdm_as_submitted.pdf
", "abstract": "The design of a deployable spacecraft, measuring 60 m \u00d7 60 m, and with an areal density 100 g m^(\u22122) , is described. This spacecraft can be packaged into a cylinder measuring 1.5 m in height and 1 m in diameter. It can be deployed to a flat configuration, where it acts as a stiff, lightweight support framework for multifunctional tiles that collect sunlight, generate electric power, and transmit to a ground station on Earth.", "date": "2016-01", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2016-1950", "id_number": "CaltechAUTHORS:20160930-131726070", "isbn": "978-1-62410-394-0", "book_title": "3rd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160930-131726070", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" }, { "agency": "Northrop Grumman Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "2016-1950", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "Keck-Institute-for-Space-Studies" }, { "id": "GALCIT" }, { "id": "Space-Solar-Power-Project" } ] }, "doi": "10.2514/6.2016-1950", "primary_object": { "basename": "2016_sdm_as_submitted.pdf", "url": "https://authors.library.caltech.edu/records/k6xmf-g5p42/files/2016_sdm_as_submitted.pdf" }, "resource_type": "book_section", "pub_year": "2016", "author_list": "Arya, Manan; Lee, Nicolas; et el." }, { "id": "https://authors.library.caltech.edu/records/35755-ed870", "eprint_id": 65842, "eprint_status": "archive", "datestamp": "2023-08-22 15:51:25", "lastmod": "2024-01-13 16:47:01", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Costantine-J", "name": { "family": "Costantine", "given": "J." } }, { "id": "Tawk-Y", "name": { "family": "Tawk", "given": "Y." } }, { "id": "Christodoulou-C-G", "name": { "family": "Christodoulou", "given": "C. G." } }, { "id": "Maqueda-I", "name": { "family": "Maqueda", "given": "I." } }, { "id": "Sakovsky-M", "name": { "family": "Sakovsky", "given": "M." }, "orcid": "0000-0002-3683-8505" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "A New UHF Deployable Antenna for CubeSats", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "UHF antennas; antenna radiation patterns; satellite antennas; spiral antennas.", "note": "\u00a9 2015 IEEE.", "abstract": "This paper discusses the design of a new conical log spiral antenna that can operate at UHF frequencies. The antenna constitutes a suitable candidate for deployment on top of a 6U CubeSat system. The conical log spiral is designed to operate between 300 MHz and 600 MHz and exhibit circular polarization as well as an acceptable gain. The antenna is also required to satisfy size constraints by being compactly folded during launch and deployed successfully once in orbit.", "date": "2015-07", "date_type": "published", "publisher": "IEEE", "place_of_pub": "New York, NY", "pagerange": "1426-1427", "id_number": "CaltechAUTHORS:20160401-100827980", "isbn": "978-1-4799-7815-1", "book_title": "2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160401-100827980", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1109/APS.2015.7305102", "resource_type": "book_section", "pub_year": "2015", "author_list": "Costantine, J.; Tawk, Y.; et el." }, { "id": "https://authors.library.caltech.edu/records/j94hc-9t481", "eprint_id": 99030, "eprint_status": "archive", "datestamp": "2023-08-20 06:13:23", "lastmod": "2023-10-18 17:48:13", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Binetti-S", "name": { "family": "Binetti", "given": "Simona" } }, { "id": "Le-Donne-A", "name": { "family": "Le Donne", "given": "Alessia" } }, { "id": "Rolfi-A", "name": { "family": "Rolfi", "given": "Andrea" } }, { "id": "Grilli-E", "name": { "family": "Grilli", "given": "Emanuele" } }, { "id": "J\u00e4ggi-B", "name": { "family": "J\u00e4ggi", "given": "Beat" } }, { "id": "Neuenschwander-B", "name": { "family": "Neuenschwander", "given": "Beat" } }, { "id": "Busto-C", "name": { "family": "Busto", "given": "Chiara" } }, { "id": "Scorticati-D", "name": { "family": "Scorticati", "given": "Davide" } }, { "id": "Longoni-L", "name": { "family": "Longoni", "given": "Luca" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Random Surface Texturing of mc-Silicon for Solar Cells with Picosecond Lasers; a Comparison between 1064 nm, 532 nm and 355 nm Laser Emission Wavelengths", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2015 Optical Society of America.\n\nPublished - 07182897.pdf
", "abstract": "Multicrystalline Silicon was textured with picosecond laser. Different laser wavelengths (\u03bb = 1064, 532, 355 nm) where compared regarding laser-induced damage. We found that \u03bb = 355 nm picosecond radiation resulted in shallower defect-reach region.", "date": "2015-05-07", "date_type": "published", "publisher": "Optical Society of America", "place_of_pub": "Washington, DC", "pagerange": "Art. No. AM2K.5", "id_number": "CaltechAUTHORS:20191002-150220868", "isbn": "978-1-55752-968-8", "book_title": "2015 Conference on Lasers and Electro-Optics (CLEO)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191002-150220868", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1364/cleo_at.2015.am2k.5", "primary_object": { "basename": "07182897.pdf", "url": "https://authors.library.caltech.edu/records/j94hc-9t481/files/07182897.pdf" }, "resource_type": "book_section", "pub_year": "2015", "author_list": "Binetti, Simona; Le Donne, Alessia; et el." }, { "id": "https://authors.library.caltech.edu/records/5ngnb-pc182", "eprint_id": 97982, "eprint_status": "archive", "datestamp": "2023-08-20 04:33:02", "lastmod": "2023-10-18 16:56:12", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ning-Xin", "name": { "family": "Ning", "given": "Xin" }, "orcid": "0000-0002-9432-3665" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Buckling Analysis of Axially Loaded Corrugated Cylindrical Shells", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 American Institute of Aeronautics and Astronautics. \n\nWe thank Dr. Katia Bertoldi for providing her presentations in the 2014 CISM short courses. We also thank Drs. Francisco L\u00f3pez Jim\u00e9nez and Ryan Elliott for helpful discussions on the Bloch wave method.", "abstract": "Buckling analyses of heavily corrugated cylindrical shells based on detailed full finite element models are usually computationally expensive. To address this issue, we have pro- posed an efficient computational method of predicting the onset of buckling for corrugated cylindrical shells which builds on the Bloch wave method for infinitely periodic structures. We modified the traditional Bloch wave method in order to analyze the buckling of rotationally periodic shell structures. We have developed an efficient algorithm to perform our modified Bloch wave method. The buckling behavior of composite corrugated cylindrical shells with a range of numbers of corrugations was analyzed. Linear and nonlinear buckling analyses of detailed full finite element models were also performed and compared to our method. Comparisons showed that our modified Bloch wave method was able to obtain highly accurate buckling loads and it was able to capture both global and local buckling modes. It was also found that the computational time required by our modified Bloch wave method did not scale up as the number of corrugations increased.", "date": "2015-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2015-1435", "id_number": "CaltechAUTHORS:20190816-144341971", "isbn": "9781624103421", "book_title": "AIAA SciTech : 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341971", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2015-1435", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2015-1435", "resource_type": "book_section", "pub_year": "2015", "author_list": "Ning, Xin and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/8vr3q-rbt13", "eprint_id": 97980, "eprint_status": "archive", "datestamp": "2023-08-20 04:32:47", "lastmod": "2023-10-18 16:56:02", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Sakovsky-M", "name": { "family": "Sakovsky", "given": "M." }, "orcid": "0000-0002-3683-8505" }, { "id": "Maqueda-I", "name": { "family": "Maqueda", "given": "I." } }, { "id": "Karl-C", "name": { "family": "Karl", "given": "C." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Costantine-J", "name": { "family": "Costantine", "given": "J." } } ] }, "title": "Dual-Matrix Composite Wideband Antenna Structures for CubeSats", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 American Institute of Aeronautics and Astronautics. \n\nDr Jeremy Banik at AFRL and Dr Tom Murphey, formerly at AFRL, have provided the initial inspiration for this work and many helpful comments and suggestions. This research was supported by the AFOSR (award no. FA9550-13-1-0061, program manager Dr David Stargel).", "abstract": "A concept for a deployable high-performance antenna for CubeSats is presented. The detailed design of a conical log-spiral antenna with wideband operation between 250 500 MHz, a gain of above 5 dB, and circular polarization is performed using electromagnetic simulations. A structural concept using dual-matrix composites with soft hinge regions, allowing the antenna to be packaged into small volumes, is developed. An antenna prototype is fabricated using Astroquartz fibers in an epoxy matrix; a high-strain silicone matrix is used in the hinge regions. Structural and electromagnetic analyses are conducted and show good agreement with predicted performance thus demonstrating the validity of the proposed antenna concept.", "date": "2015-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2015-0944", "id_number": "CaltechAUTHORS:20190816-144341792", "isbn": "9781624103452", "book_title": "AIAA SciTech : 2nd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341792", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "FA9550-13-1-0061" } ] }, "other_numbering_system": { "items": [ { "id": "2015-0944", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2015-0944", "resource_type": "book_section", "pub_year": "2015", "author_list": "Sakovsky, M.; Maqueda, I.; et el." }, { "id": "https://authors.library.caltech.edu/records/6b3wk-jy838", "eprint_id": 97979, "eprint_status": "archive", "datestamp": "2023-08-20 04:32:33", "lastmod": "2023-10-18 16:56:00", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Li-Jun", "name": { "family": "Li", "given": "Jun" } }, { "id": "Kwok-Kawai", "name": { "family": "Kwok", "given": "Kawai" }, "orcid": "0000-0001-6876-4267" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Large-Strain Viscoelastic Constitutive Models for Thin Polyethylene Films", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2015 American Institute of Aeronautics and Astronautics.", "abstract": "This paper presents a constitutive model capable of predicting the thermoviscoelastic behavior of the balloon thin film StratoFilm subject to large strains up to yielding. The model is based on the free volume theory of nonlinear thermoviscoelasticity and extended to orthotropic membranes. An ingredient of the present approach is that the experimentally inaccessible out-of-plane material properties are determined by fitting the model predictions to the measured non-linear behavior of the film. Creep tests, uniaxial tension tests, and biaxial bubble tests are used to determine the material parameters. The model has been validated experimentally, against data obtained from uniaxial tension tests and biaxial cylindrical tests at a wide range of temperatures and strain rates spanning two orders of magnitude (0.01%/s ~ 1%/s).", "date": "2015-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2015-0194", "id_number": "CaltechAUTHORS:20190816-144341701", "isbn": "9781624103421", "book_title": "AIAA SciTech : 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341701", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2015-0194", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2015-0194", "resource_type": "book_section", "pub_year": "2015", "author_list": "Li, Jun; Kwok, Kawai; et el." }, { "id": "https://authors.library.caltech.edu/records/gdayh-9ed40", "eprint_id": 97981, "eprint_status": "archive", "datestamp": "2023-08-20 04:32:54", "lastmod": "2023-10-18 16:56:10", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Delapierre-M", "name": { "family": "Delapierre", "given": "M." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Spin-Stabilized Membrane Antenna Structures", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 American Institute of Aeronautics and Astronautics.", "abstract": "This paper explores the possibility of using spin-stabilized membrane structures for large phased array microwave antennas (typically L-Band or S-Band from 1 GHz to 4 GHz). The biggest challenge is to be able to sufficiently stabilize the system in order to limit its sensitivity to space disturbances (maneuvering, reaction wheels, and other imposed forces) and manufacturing imperfections. First, a flatness requirement for microwave antennas is derived. Then a frequency analysis of orthotropic flat structures spinning at different angular velocities and with different bending stiffnesses is carried out. These analyses, together with finite element simulations, are used to derive scaling laws to study the behavior of structures spinning in space. A test case, based on a spinning structure perturbed at the hub, is considered. An analytical solution of the free vibration of this test case is compared to the results of finite-element method simulations with Abaqus/Standard. Finally a test setup to study the dynamics of scaled spinning membranes in the laboratory is presented. Gravity effects in such an experiment are expected to be small.", "date": "2015-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, Virginia", "pagerange": "Art. No. 2015-1403", "id_number": "CaltechAUTHORS:20190816-144341883", "isbn": "9781624103452", "book_title": "AIAA SciTech : 2nd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144341883", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2015-1403", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2015-1403", "resource_type": "book_section", "pub_year": "2015", "author_list": "Delapierre, M. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/0123w-vgg70", "eprint_id": 97967, "eprint_status": "archive", "datestamp": "2023-08-20 04:32:21", "lastmod": "2023-10-18 16:55:25", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arya-M", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Wrapping Thick Membranes with Slipping Folds", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 American Institute of Aeronautics and Astronautics. \n\nSupport from the Northrop Grumman Corporation is gratefully acknowledged. \n\nN. Lee was supported through this work by a postdoctoral fellowship from the W. M. Keck Institute for Space Studies.", "abstract": "A novel method of packaging finite-thickness membranes tightly and with high packaging efficiency is presented. This method allows the membrane to be packaged without extension and without plastic creasing. As such, initially flat membranes can be deployed to a flat state. Membrane thickness is accommodated by removing material along fold lines and exploiting the slipping deformation mechanism thus created. \n\nAlso presented are methods for prestressing and deploying membranes packaged according to this technique. Initial tests demonstrate packaging efficiencies of 73% without plastic deformation. Experimental deployment tests of a meter-scale model showed controlled deployment with unfolding forces of less than 0.6 N.", "date": "2015-01-05", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2015-0682", "id_number": "CaltechAUTHORS:20190816-144340621", "isbn": "9781624103452", "book_title": "AIAA SciTech : 2nd AIAA Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144340621", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Corporation" }, { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "other_numbering_system": { "items": [ { "id": "2015-0682", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" } ] }, "doi": "10.2514/6.2015-0682", "resource_type": "book_section", "pub_year": "2015", "author_list": "Arya, Manan; Lee, Nicolas; et el." }, { "id": "https://authors.library.caltech.edu/records/q6gsz-bxg73", "eprint_id": 78235, "eprint_status": "archive", "datestamp": "2023-08-20 04:16:47", "lastmod": "2024-01-13 20:28:26", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Folding and Deployment of Thin Shell Structures", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2015 CISM Udine. \n\nFinancial support from AFOSR award no. FA9550-13-1-0061 (program manager Dr David Stargel) is acknowledged.", "abstract": "Thin shells made of high modulus material are widely used as lightweight deployable space structures. The focus of this chapter is the most basic deployable thin shell structure, namely a straight, transversely curved strip known as a tape spring. Following a review of the materials used for the construction of deployable thin shell structures, including constitutive models and failure criteria developed specifically for this type of structures, this chapter provides an introduction to the mechanics of tape springs and tape spring hinges. Finite element techniques to model deployable structures containing tape springs are presented and the ability of these models to accurately simulate experimentally observed behavior is demonstrated. These tools can be used to design structures able to achieve specific behaviors. As an example, the design of a two-hinge boom that can be wrapped around a small spacecraft without any damage, and can dynamically deploy and smoothly latch into the deployed configuration is presented.", "date": "2015", "date_type": "published", "publisher": "Springer", "place_of_pub": "New York, NY", "pagerange": "179-267", "id_number": "CaltechAUTHORS:20170615-080812634", "isbn": "978-3-7091-1876-4", "book_title": "Extremely Deformable Structures", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170615-080812634", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "FA9550-13-1-0061" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Bigoni-D", "name": { "family": "Bigoni", "given": "Davide" } } ] }, "doi": "10.1007/978-3-7091-1877-1_5", "resource_type": "book_section", "pub_year": "2015", "author_list": "Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/f4a5t-fkk73", "eprint_id": 99322, "eprint_status": "archive", "datestamp": "2023-08-20 03:13:19", "lastmod": "2023-10-18 18:13:49", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hogstrom-K", "name": { "family": "Hogstrom", "given": "Kristina" } }, { "id": "Backes-P", "name": { "family": "Backes", "given": "Paul" } }, { "id": "Burdick-J-W", "name": { "family": "Burdick", "given": "Joel" } }, { "id": "Kennedy-B", "name": { "family": "Kennedy", "given": "Brett" } }, { "id": "Kim-Junggoon", "name": { "family": "Kim", "given": "Junggon" } }, { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Malakhova-G", "name": { "family": "Malakhova", "given": "Galina" } }, { "id": "Mukherjee-R", "name": { "family": "Mukherjee", "given": "Rudranarayan" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Wu-Yen-Hung", "name": { "family": "Wu", "given": "Yen-Hung" } } ] }, "title": "A Robotically-Assembled 100-Meter Space Telescope", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2014 IAF.\n\nPaper number: IAC-14,C2,2,6,x26019.\n\nPublished - IAC-14,C2,2,6,x26019.brief.pdf
", "abstract": "The future of astronomy may rely on extremely large space telescopes in order to image Earth-sized exoplanets or study the first stars. These telescopes will not be possible without a radical shift in design methods and concepts that are not limited by the size of a single payload fairing. In-Space Telescope Assembly Robotics (ISTAR) is one solution. The ISTAR project has developed a concept for an optical space telescope with a collecting area of nearly 8000 square meters, launched in pieces from the ground, and assembled by highly dexterous robots in space. The concept has been demonstrated to meet optical requirements and failure criteria. \n\nThis paper focuses on the design and feasibility analysis of the telescope structure, as it has to be stiff and precise enough to maintain optical tolerances while also being amenable to robotic operations. The overall optical scheme of the telescope is first presented, which includes four main elements: a spherical primary mirror roughly hexagonal in shape spanning 100 meters flat to flat; an eyepiece containing all subsequent mirrors and detectors; a metrology system; and a sun shade. The conceived structure that connects and supports these components is then detailed, beginning with the concept of operations and assembly process and ending with the results of a comprehensive structural analysis. Particular attention is given to the truss structure that supports the primary mirror segments, called the backplane. The backplane design uses both robotic assembly and deployable structures to reduce assembly time, featuring expanding truss modules grouped with pre-assembled clusters of mirror segments that are connected together in space. The truss geometry of the structure was chosen from a vast design space, which was first narrowed using \"back-of-the-envelope\" analytical methods, to satisfy vibrational stiffness and mass criteria. Higher fidelity simulations using finite element analysis and matrix methods were then used to demonstrate that the structure meets optical and failure strength requirements while subjected to loads typically encountered in the space environment. \n\nThis paper includes many of the decisions and trades made throughout the activity, providing a reference for the design of large modular space structures and laying the groundwork for future flight missions of this nature.", "date": "2014-10", "date_type": "published", "publisher": "International Astronautical Federation", "id_number": "CaltechAUTHORS:20191017-082538614", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191017-082538614", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "primary_object": { "basename": "IAC-14,C2,2,6,x26019.brief.pdf", "url": "https://authors.library.caltech.edu/records/f4a5t-fkk73/files/IAC-14,C2,2,6,x26019.brief.pdf" }, "resource_type": "book_section", "pub_year": "2014", "author_list": "Hogstrom, Kristina; Backes, Paul; et el." }, { "id": "https://authors.library.caltech.edu/records/760cp-p5640", "eprint_id": 98820, "eprint_status": "archive", "datestamp": "2023-08-20 03:13:15", "lastmod": "2023-10-18 17:39:49", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Underwood-C", "name": { "family": "Underwood", "given": "Craig" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Lappas-V-J", "name": { "family": "Lappas", "given": "Vaios J." } }, { "id": "Bridges-C-P", "name": { "family": "Bridges", "given": "Christopher P." } }, { "id": "Baker-J", "name": { "family": "Baker", "given": "John" } } ] }, "title": "Using CubeSat/Micro-Satellite Technology to Demonstrate the Autonomous Assembly of a Reconfigurable Space Telescope (AAReST)", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2014 IAF. \n\n21st IAA Symposium on Small Satellite Missions. \n\nPaper number: IAC-14,B4,2,4,x25987.\n\nPublished - IAC-14,B4,2,4,x25987.brief.pdf
", "abstract": "Future space telescopes with diameter over 20 m will require new approaches: either high-precision formation flying or in-orbit assembly. We believe the latter holds promise as a potentially lower cost and more practical solution in the near term, provided much of the assembly can be carried out autonomously. To gain experience, and to provide risk reduction, we propose a combined mico/nano-satellite demonstration mission that will focus on the required optical technology (adaptive mirrors, phase-sensitive detectors) and autonomous rendezvous and docking technology (inter-satellite links, relative position sensing, automated docking mechanisms). The mission will involve two \"3U\" Cubesat-like nanosatellites (\"MirrorSats\") each carrying an electrically actuated adaptive mirror, and each capable of autonomous un-docking and re-docking with a small central \"15U\" class micro/nano-satellite core, which houses two fixed mirrors and a boom-deployed focal plane assembly. All three spacecraft will be launched as a single ~40kg micro-satellite package.\nThe spacecraft busses are based on heritage from Surrey's SNAP-1 and STRaND-1 missions (launched in 2000 and 2013 respectively), whilst the optics, imaging sensors and shape adjusting adaptive mirrors (with their associated adjustment mechanisms) are provided by CalTech/JPL. The spacecraft busses provide precise orbit and attitude control, with inter-satellite links and optical navigation to mediate the docking process. The docking system itself is based on the electromagnetic docking system being developed at the Surrey Space Centre (SSC), together with rendezvous sensing technology developed for STRaND-2. On orbit, the mission profile will firstly establish the imaging capability of the compound spacecraft before undocking, and then autonomously re-docking a single MirrorSat. This will test the docking system, autonomous navigation and system identification technology. If successful, the next stage will see the two MirrorSat spacecraft undock and re-dock to the core spacecraft in a linear formation to represent a large (but sparse) aperture for high resolution imaging. The imaging of stars is the primary objective, but other celestial and terrestrial targets are being considered. Teams at CalTech and SSC are currently working on the mission planning and development of space hardware. The autonomous rendezvous and docking system is currently under test on a 2D air-bearing table at SSC, and the propulsion and precision attitude control system is currently in development. Launch is planned for 2015. This paper details the mission concept, technology involved and progress to date.", "date": "2014-10", "date_type": "published", "publisher": "International Astronautical Federation", "id_number": "CaltechAUTHORS:20190924-081804330", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190924-081804330", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "primary_object": { "basename": "IAC-14,B4,2,4,x25987.brief.pdf", "url": "https://authors.library.caltech.edu/records/760cp-p5640/files/IAC-14,B4,2,4,x25987.brief.pdf" }, "resource_type": "book_section", "pub_year": "2014", "author_list": "Underwood, Craig; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/yc0m9-3j140", "eprint_id": 97888, "eprint_status": "archive", "datestamp": "2023-08-20 02:22:49", "lastmod": "2023-10-18 16:50:57", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Packaging and deployment strategies for synthetic aperture radar membrane antenna arrays", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2014 IEEE. \n\nN. Lee was supported by a postdoctoral fellowship from the W. M. Keck Institute for Space Studies.", "abstract": "The performance of spaceborne synthetic aperture radar (SAR) is limited by the size and therefore the areal density of the antenna array. Conventional arrays consist of radiating elements mounted on hinged panels that are relatively heavy. In order to produce larger arrays capable of operating at higher altitudes, or to support comparable SAR payloads on smaller spacecraft, a lighter structure such as one using membranes must be used. Membrane antenna arrays have been developed, but deployment remains a challenge. This paper describes possible techniques to package and deploy membrane structures that can support these antenna arrays.", "date": "2014-08", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1-4", "id_number": "CaltechAUTHORS:20190814-104606776", "isbn": "9781467352253", "book_title": "2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190814-104606776", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" } ] }, "doi": "10.1109/ursigass.2014.6929611", "resource_type": "book_section", "pub_year": "2014", "author_list": "Lee, Nicolas and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/q1k24-tgt76", "eprint_id": 58285, "eprint_status": "archive", "datestamp": "2023-08-20 02:01:02", "lastmod": "2024-01-13 16:22:26", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Steeves-J", "name": { "family": "Steeves", "given": "John" } }, { "id": "Laslandes-M", "name": { "family": "Laslandes", "given": "Marie" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Redding-D", "name": { "family": "Redding", "given": "David" } }, { "id": "Bradford-S-C", "name": { "family": "Bradford", "given": "Samuel Case" } }, { "id": "Wallace-J-K", "name": { "family": "Wallace", "given": "James Kent" } }, { "id": "Barbee-T", "name": { "family": "Barbee", "given": "Troy" } } ] }, "title": "Design, fabrication and testing of active carbon shell mirrors for space telescope applications", "ispublished": "unpub", "full_text_status": "public", "keywords": "Active Mirrors, Space Telescopes, CFRP, Nanolaminate, Replication, Metrology", "note": "\u00a9 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). Published date July 28, 2014. \n\nWe thank Keith Patterson, Andrew Shapiro and Scott Basinger ( NASA JPL) for their technical and programmatic support throughout t.he project. Financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada is gratefully acknowledged. A part of this research was carried out at the Jet. Propulsion Laboratory, California Institute of Technology under a contract With the National Aeronautics and Space Administration (NASA).\n\nPublished - Steeves_2014p915105.pdf
", "abstract": "A novel active mirror concept based on carbon fiber reinforced polymer (CFRP) materials is presented. A nanolaminate facesheet, active piezoelectric layer and printed electronics are implemented in order to provide the reflective surface, actuation capabilities and electrical wiring for the mirror. Mirrors of this design are extremely thin (500-850 \u00b5m), lightweight (~ 2 kg/m^2) and have large actuation capabilities (~ 100 \u00b5m peak- to-valley deformation per channel). Replication techniques along with simple bonding/transferring processes are implemented eliminating the need for grinding and polishing steps. An outline of the overall design, component materials and fabrication processes is presented. A method to size the active layer for a given mirror design, along with simulation predictions on the correction capabilities of the mirror are also outlined. A custom metrology system used to capture the highly deformable nature of the mirrors is demonstrated along with preliminary prototype measurements.", "date": "2014-07-28", "date_type": "published", "publisher": "Society of Photo-Optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 915105", "id_number": "CaltechAUTHORS:20150616-134615567", "isbn": "978-0-8194-9619-5", "book_title": "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150616-134615567", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "NASA/JPL/Caltech" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Navarro-R", "name": { "family": "Navarro", "given": "Ram\u03ccn" } }, { "id": "Cunningham-C-R", "name": { "family": "Cunningham", "given": "Colin R." } }, { "id": "Barto-A-A", "name": { "family": "Barto", "given": "Allison A." } } ] }, "doi": "10.1117/12.2056560", "primary_object": { "basename": "Steeves_2014p915105.pdf", "url": "https://authors.library.caltech.edu/records/q1k24-tgt76/files/Steeves_2014p915105.pdf" }, "resource_type": "book_section", "pub_year": "2014", "author_list": "Steeves, John; Laslandes, Marie; et el." }, { "id": "https://authors.library.caltech.edu/records/cyt65-8xc31", "eprint_id": 61058, "eprint_status": "archive", "datestamp": "2023-08-20 01:55:22", "lastmod": "2024-01-13 16:26:02", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Laslandes-M", "name": { "family": "Laslandes", "given": "Marie" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Steeves-J-B", "name": { "family": "Steeves", "given": "John" } }, { "id": "Patterson-K", "name": { "family": "Patterson", "given": "Keith" } } ] }, "title": "Optimization of Electrode Configuration in Surface-Parallel Actuated Deformable Mirrors", "ispublished": "unpub", "full_text_status": "public", "keywords": "Deformable Mirror - Active Optics - Telescope - Optimization - Bimorph Mirror", "note": "\u00a9 2014 SPIE.\n\nWe thank Xin Ning (Caltech) for help with the optimization algorithm. ML acknowledges the support of a postdoctoral grant from the French Defense procurement agency (DGA) held through Aix-Marseille University, France. Financial support from the Keck Institute of Space Studies and the Dow Resnick Bridge program at Caltech is gratefully acknowledged. A part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with National Aeronautics and Space Administration (NASA).\n\nPublished - Laslandes_2014p914843.pdf
", "abstract": "Thin, lightweight and low-cost deformable mirrors have been recently proposed, providing a pertinent device for wavefront error correction. We present different approaches to optimize actuator arrangement. The design is optimized according to a given correction requirement, through the number of electrodes, their shape and location. A first method focuses on the compensation of a given optical aberration (astigmatism). A second method directly optimizes the correction of a set of optical modes, taking into account the voltage limitation. We will describe the optimization techniques and give some examples of applications and design performance.", "date": "2014-07-21", "date_type": "published", "publisher": "Society of Photo-Optical Instrumentation Engineers", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 914843", "id_number": "CaltechAUTHORS:20151013-130020372", "isbn": "978-0-8194-9616-4", "book_title": "Adaptive optics systems IV", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151013-130020372", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Direction g\u00e9n\u00e9rale de l'armement (DGA)" }, { "agency": "Keck Institute for Space Studies (KISS)" }, { "agency": "Dow Resnick Bridge Program" }, { "agency": "NASA/JPL/Caltech" } ] }, "local_group": { "items": [ { "id": "Keck-Institute-for-Space-Studies" }, { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Marchetti-E", "name": { "family": "Marchetti", "given": "Enrico" } }, { "id": "Close-L-M", "name": { "family": "Close", "given": "Laird M." } }, { "id": "V\u00e9ran-J-P", "name": { "family": "V\u00e9ran", "given": "Jean-Pierre" } } ] }, "doi": "10.1117/12.2056495", "primary_object": { "basename": "Laslandes_2014p914843.pdf", "url": "https://authors.library.caltech.edu/records/cyt65-8xc31/files/Laslandes_2014p914843.pdf" }, "resource_type": "book_section", "pub_year": "2014", "author_list": "Laslandes, Marie; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/ndz6k-gd066", "eprint_id": 78457, "eprint_status": "archive", "datestamp": "2023-08-19 23:28:30", "lastmod": "2024-01-13 20:29:05", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liewer-P-C", "name": { "family": "Liewer", "given": "Paulett C." } }, { "id": "Klesh-A-T", "name": { "family": "Klesh", "given": "Andrew T." } }, { "id": "Lo-Martin-W", "name": { "family": "Lo", "given": "Martin W." } }, { "id": "Murphy-N", "name": { "family": "Murphy", "given": "Neil" } }, { "id": "Staehle-R-L", "name": { "family": "Staehle", "given": "Robert L." } }, { "id": "Angelopoulos-V", "name": { "family": "Angelopoulos", "given": "Vassilis" } }, { "id": "Anderson-B-D", "name": { "family": "Anderson", "given": "Brian D." } }, { "id": "Arya-M", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Cutler-J-W", "name": { "family": "Cutler", "given": "James W." } }, { "id": "Lightsey-E-G", "name": { "family": "Lightsey", "given": "E. Glenn" } }, { "id": "Vourlidas-A", "name": { "family": "Vourlidas", "given": "Angelos" }, "orcid": "0000-0002-8164-5948" } ] }, "title": "A Fractionated Space Weather Base at L_5 using CubeSats and Solar Sails", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2014 Springer. \n\nDate: 04 February 2014. \n\nPart of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology under a contract with the National Aeronautics and Space Administration. We thank Tomas Svitek, Stellar Exploration Inc., and Courtney Duncan, JPL, for useful technical discussions. We would like to thank Keck Institute for Space Studies at the California Institute of Technology for hosting the Workshop and providing the opportunity for the interaction between the scientists and the experts in the CubeSat community. We thank Charles Norton, JPL, and Michael Johnson, JA, for organizing the Workshop.\n\nPublished - 10.1007_2F978-3-642-34907-2_19.pdf
", "abstract": "The Sun\u2013Earth L_5 Lagrange point is an ideal location for an operational space weather forecasting mission to provide early warning of Earth-directed solar storms (coronal mass ejections, shocks and associated solar energetic particles). Such storms can cause damage to power grids, spacecraft, communications systems and astronauts, but these effects can be mitigated if early warning is received. Space weather missions at L5 have been proposed using conventional spacecraft and chemical propulsion at costs of hundreds of millions of dollars. Here we describe a mission concept that could accomplish many of the goals at a much lower cost by dividing the payload among a cluster of interplanetary CubeSats that reach orbits around L5 using solar sails.", "date": "2014-02-04", "date_type": "published", "publisher": "Springer", "pagerange": "269-288", "id_number": "CaltechAUTHORS:20170622-081730492", "isbn": "978-3-642-34906-5", "book_title": "Advances in Solar Sailing", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170622-081730492", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL/Caltech" } ] }, "contributors": { "items": [ { "id": "Macdonald-M", "name": { "family": "Macdonald", "given": "Malcolm" } } ] }, "doi": "10.1007/978-3-642-34907-2_19", "primary_object": { "basename": "10.1007_2F978-3-642-34907-2_19.pdf", "url": "https://authors.library.caltech.edu/records/ndz6k-gd066/files/10.1007_2F978-3-642-34907-2_19.pdf" }, "resource_type": "book_section", "pub_year": "2014", "author_list": "Liewer, Paulett C.; Klesh, Andrew T.; et el." }, { "id": "https://authors.library.caltech.edu/records/k3snx-91309", "eprint_id": 98046, "eprint_status": "archive", "datestamp": "2023-08-19 23:05:03", "lastmod": "2023-10-18 16:59:42", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Arya-M", "name": { "family": "Arya", "given": "Manan" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Deployment mechanics of highly compacted thin membrane structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2014 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 10 Jan 2014.", "abstract": "We studied the effects of membrane thickness and crease density on the forces required to unfold creased membrane structures. 26 cm-diameter models were made using two different thicknesses (7.5 \u03bcm and 25 \u03bcm) of polyimide film, and wrapped around a 4 cm-diameter hub using two different crease densities. They were deployed quasi-statically, and the deployment forces were measured. Two regimes were observed: an initial phase (up to about 85% deployed) of low and variable stiffness, and a second phase (above 85% deployed) of high stiffness. The thinner membrane models required higher deployment forces than the thicker membrane models during the initial phase.", "date": "2014-01-10", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2014-1038", "id_number": "CaltechAUTHORS:20190820-141521974", "isbn": "978-1-62410-319-3", "book_title": "Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190820-141521974", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2014-1038", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2014-1038", "resource_type": "book_section", "pub_year": "2014", "author_list": "Arya, Manan and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/aqx0m-7g324", "eprint_id": 98045, "eprint_status": "archive", "datestamp": "2023-08-19 23:05:00", "lastmod": "2023-10-18 16:59:39", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Self-Supporting Membrane Structures with Curved Creases for Smooth Packaging and Deployment", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2014 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 10 Jan 2014.", "abstract": "We present a design for a deployable multi-layered membrane structure that uses a curved crease pattern to enable smooth wrapping around a spool. The crease pattern is parameterized to enable a variety of designs, and a specific implementation was selected based on an existing patch antenna array design. We constructed a prototype structure based on this geometry, and conducted deployment tests to measure the deployment force profile required to unfold the structure and to unwrap it from a spool. We find that the deployment force for unwrapping is significantly higher than for unfolding. These force profiles are repeatable over multiple deployments and the global trends do not depend on deployment rates over the range tested, between 1 and 8 mm/s. However, the local dynamic behavior can depend on deployment rate.", "date": "2014-01-10", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2014-1037", "id_number": "CaltechAUTHORS:20190820-140510587", "isbn": "978-1-62410-319-3", "book_title": "Spacecraft Structures Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190820-140510587", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2014-1037", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2014-1037", "resource_type": "book_section", "pub_year": "2014", "author_list": "Lee, Nicolas and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/w4jnp-wcm64", "eprint_id": 44486, "eprint_status": "archive", "datestamp": "2023-08-19 22:54:57", "lastmod": "2023-10-26 14:20:25", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Nicolas", "name": { "family": "Lee", "given": "Nicolas" }, "orcid": "0000-0001-5500-1324" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Multi-layered membrane structures with curved creases for smooth packaging and deployment", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2014 AIAA.\n\nN. Lee was supported through this work by a postdoctoral fellowship from the W. M. Keck Institute for Space\nStudies. We thank P. Arakelian for his assistance with the experimental setup.", "abstract": "We present a design for a deployable multi-layered membrane structure that uses a curved crease pattern\nto enable smooth wrapping around a spool. The crease pattern is parameterized to enable a variety of designs,\nand a specific implementation was selected based on an existing patch antenna array design. We constructed a\nprototype structure based on this geometry, and conducted deployment tests to measure the deployment force\nprofile required to unfold the structure and to unwrap it from a spool. We find that the deployment force\nfor unwrapping is significantly higher than for unfolding. These force profiles are repeatable over multiple\ndeployments and the global trends do not depend on deployment rates over the range tested, between 1 and\n8 mm/s. However, the local dynamic behavior can depend on deployment rate.", "date": "2014-01", "date_type": "published", "id_number": "CaltechAUTHORS:20140324-181344254", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140324-181344254", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "other_numbering_system": { "items": [ { "id": "2014-1037", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "Keck-Institute-for-Space-Studies" }, { "id": "GALCIT" } ] }, "doi": "10.2514/6.2014-1037", "resource_type": "book_section", "pub_year": "2014", "author_list": "Lee, Nicolas and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/3j86n-70n38", "eprint_id": 97903, "eprint_status": "archive", "datestamp": "2023-08-19 22:58:50", "lastmod": "2023-10-18 16:51:54", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Costantine-J", "name": { "family": "Costantine", "given": "J." } }, { "id": "Tawk-Y", "name": { "family": "Tawk", "given": "Y." } }, { "id": "Ayoub-F", "name": { "family": "Ayoub", "given": "F." }, "orcid": "0000-0002-7389-8400" }, { "id": "Christodoulou-C-G", "name": { "family": "Christodoulou", "given": "C. G." } }, { "id": "Olson-G", "name": { "family": "Olson", "given": "G." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "UHF deployable antenna structures for CubeSats", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2014 IEEE.", "abstract": "Antenna design for small satellites such as CubeSats constitute a challenge for designers especially at UHF frequencies. The small size of the CubeSat (10 cm x 10 cm x 10 cm) imposes several constraints on the antenna design. Extreme packaging ratios and advanced deployment mechanisms have to be employed to cater for UHF antennas on a CubeSat platform.", "date": "2014-01", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1", "id_number": "CaltechAUTHORS:20190814-154556302", "isbn": "9781479931200", "book_title": "2014 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM)", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190814-154556302", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1109/usnc-ursi-nrsm.2014.6928057", "resource_type": "book_section", "pub_year": "2014", "author_list": "Costantine, J.; Tawk, Y.; et el." }, { "id": "https://authors.library.caltech.edu/records/2c5md-h6m32", "eprint_id": 98072, "eprint_status": "archive", "datestamp": "2023-08-19 21:46:50", "lastmod": "2023-10-18 17:01:06", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hegyi-D", "name": { "family": "Hegyi", "given": "Dezso" } }, { "id": "Li-Jun", "name": { "family": "Li", "given": "Jun" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Failure of Polyethylene Thin Film Membrane Structures", "ispublished": "unpub", "full_text_status": "public", "keywords": "StratoFilm, J-integral, Viscoelasticity, Free Volume Model", "note": "\u00a9 2013 CIMNE.\n\nWe thank Prof. W. Knauss for helpful comments and advice. DH research at the California Institute of Technology was supported by an Imre Koranyi Civi Engineering Fellowship from the Thomas Cholnoky Foundation. Financial support from the NASA Balloon Research Program is gratefully acknowledged.\n\nPublished - 2013_Failureofpolyethilenthinfilmmembranestructures.pdf
", "abstract": "The failure of balloons made of Linear Low Density PolyEthylene (LLDPE) is investigated. The chosen film is 38 \u03bcm thick StratoFilm 420, currently used for the NASA Super-Pressure balloons [1]. The visco-elastic behaviour of the film has been extensively studied and is already accounted for in the balloon design [2, 3, 5]. The next step in the development of accurate predictive tools for super-pressure balloons requires models that capture the transition from visco-elastic and visco-plastic behaviour to fracture. It is shown that realistic estimates of failure of LLDPE membrane structures can be obtained from visco-elastic simulations based on the non-linear visco-elastic model of the balloon film proposed by Kwok [5], supplemented with a fracture resistance criterion derived from the experimentally-based J-integral.", "date": "2013-10", "date_type": "published", "publisher": "CIMNE", "place_of_pub": "Barcelona", "pagerange": "1-16", "id_number": "CaltechAUTHORS:20190821-102001622", "isbn": "9788494168604", "book_title": "Structural Membranes 2013", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190821-102001622", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Thomas Cholnoky Foundation" }, { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Bletzinger-K-U", "name": { "family": "Bletzinger", "given": "K.-U." } }, { "id": "Kr\u00f6plin-B", "name": { "family": "Kr\u00f6plin", "given": "B." } }, { "id": "O\u00f1ate-E", "name": { "family": "O\u00f1ate", "given": "E." } } ] }, "primary_object": { "basename": "2013_Failureofpolyethilenthinfilmmembranestructures.pdf", "url": "https://authors.library.caltech.edu/records/2c5md-h6m32/files/2013_Failureofpolyethilenthinfilmmembranestructures.pdf" }, "resource_type": "book_section", "pub_year": "2013", "author_list": "Hegyi, Dezso; Li, Jun; et el." }, { "id": "https://authors.library.caltech.edu/records/znww4-fsn43", "eprint_id": 99032, "eprint_status": "archive", "datestamp": "2023-08-19 20:59:21", "lastmod": "2023-10-18 17:48:17", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Brinkmeyer-A", "name": { "family": "Brinkmeyer", "given": "A." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Weaver-P-M", "name": { "family": "Weaver", "given": "P. M." } }, { "id": "Santer-M", "name": { "family": "Santer", "given": "M." } } ] }, "title": "Effects of Viscoelasticity on the Deployment of Bistable Tape Springs", "ispublished": "unpub", "full_text_status": "public", "keywords": "composites, bistability, viscoelasticity, deployable, STEM", "note": "\u00a9 2013 Canadian Association for Composite Structures and Materials.\n\nAccepted Version - PellegrinoICCM2013.pdf
", "abstract": "The effects of stowage on the deployment of composite bistable tape springs are studied. A viscoelastic analytical model is used to predict the relaxation and stability of the structure in its coiled state. The time-dependent stability analysis reveals that the structure remains bistable throughout the relaxation process. A dynamic model is then applied to predict the deployment of the structure once it is released. Experimental deployment results match the deployment predictions within 3% for the case where no stowage is applied. It is shown that stowage causes an increase in the deployment time; in this case, experimental deployment times overshoot those predicted by the model. Secondary effects are observed at high stowage temperatures, which are not predicted by the analytical model. These effects include an abrupt change in the\ndeployment dynamics and a large increase in the deployment time (deployment latency). At higher temperatures still, i.e. for stowage at 100\u00b0C, the structure fails to deploy and becomes stable at all extended lengths.", "date": "2013-08", "date_type": "published", "publisher": "Canadian Association for Composite Structures and Materials", "id_number": "CaltechAUTHORS:20191002-151926429", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191002-151926429", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Hoa-Suong-Van", "name": { "family": "Hoa", "given": "Suong Van" } }, { "id": "Hubert-P", "name": { "family": "Hubert", "given": "Pascal" } } ] }, "primary_object": { "basename": "PellegrinoICCM2013.pdf", "url": "https://authors.library.caltech.edu/records/znww4-fsn43/files/PellegrinoICCM2013.pdf" }, "resource_type": "book_section", "pub_year": "2013", "author_list": "Brinkmeyer, A.; Pellegrino, S.; et el." }, { "id": "https://authors.library.caltech.edu/records/emdt5-kcg02", "eprint_id": 45852, "eprint_status": "archive", "datestamp": "2023-08-19 20:14:59", "lastmod": "2023-10-26 18:29:55", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Liu-Yang", "name": { "family": "Liu", "given": "Yang" }, "orcid": "0000-0002-8155-9134" }, { "id": "Park-Jungwook", "name": { "family": "Park", "given": "Jungwook" } }, { "id": "Lang-R-J", "name": { "family": "Lang", "given": "Robert J." } }, { "id": "Emami-A", "name": { "family": "Emami-Neyestanak", "given": "Azita" }, "orcid": "0000-0002-6945-9958" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Humayun-M-S", "name": { "family": "Humayun", "given": "Mark S." }, "orcid": "0000-0002-5830-5208" }, { "id": "Tai-Yu-Chong", "name": { "family": "Tai", "given": "Yu-Chong" }, "orcid": "0000-0001-8529-106X" } ] }, "title": "Parylene origami structure for intraocular implantation", "ispublished": "unpub", "full_text_status": "restricted", "keywords": "Origami, parylene-C, intraocular implantation", "note": "\u00a9 2013 IEEE. The authors would like to thank all the group members in the Caltech MEMS and Micromachining lab for help and discussion. We thank Mr. Trevor Roper especially for his guidance and maintenance on equipment in the lab. We also thank Lee L. Wilson from Dr. Sergio's group and Matthew Loh from Dr. Azita's group.", "abstract": "This paper presents the use of origami technique to construct a 3D spherical structure from a 2D parylene-C (PA-C) film with designed folding crease patterns. This origami technique is developed or intended for intraocular epiretinal implant application, which requires a \"curved\" electrode array to match the curvature of the macula. The folding method and process are described here using silicone oil as a temporary glue to hold the folded structures through meniscus force. The temporary origami is then thermally set into permanent 3D shapes at 100 \u00b0C for 30 minutes in vacuum utilizing parylene-C's viscoelastic properties. The reported origami technique enables the possibility of first making an extended device in 2D format and, after a possible minimal surgical cut and insertion, then folding it into a 3D device inside the eye for necessary geometric matching with host tissues.", "date": "2013-06", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1549-1552", "id_number": "CaltechAUTHORS:20140520-140334969", "isbn": "9781467359818", "book_title": "2013 Transducers & Eurosensors XXVII", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140520-140334969", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1109/Transducers.2013.6627077", "resource_type": "book_section", "pub_year": "2013", "author_list": "Liu, Yang; Park, Jungwook; et el." }, { "id": "https://authors.library.caltech.edu/records/mxbf0-3md88", "eprint_id": 98223, "eprint_status": "archive", "datestamp": "2023-08-19 19:31:34", "lastmod": "2023-10-18 17:09:55", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ning-Xin", "name": { "family": "Ning", "given": "Xin" }, "orcid": "0000-0002-9432-3665" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Design and testing of imperfection-insensitive monocoque cylindrical shells", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2013 American Institute of Aeronautics and Astronautics.", "abstract": "The high efficiency of monocoque cylindrical shells in carrying axial loads is curtailed by their extreme sensitivity to imperfections. For practical applications, this issue has been alleviated by introducing closely stiffened shells which, however, require expensive manufacturing. Here we present an alternative approach that provides a fundamentally different solution. We design symmetry-breaking wavy cylindrical shells that avoid imperfection sensitivity. Their cross-section is formulated by NURBS interpolation on control points whose positions are optimized by evolutionary algorithms. We have applied our approach to both isotropic and orthotropic shells and have also constructed optimized composite wavy shells and measured their imperfections and experimental buckling loads. Through these experiments we have confirmed that optimally designed wavy shells are imperfection-insensitive. We have studied the mass efficiency of these new shells and found them to be more efficient than even a perfect circular cylindrical shell and most stiffened cylindrical shells.", "date": "2013-04-08", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2013-1768", "id_number": "CaltechAUTHORS:20190826-092412987", "isbn": "9781624102233", "book_title": "54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190826-092412987", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2013-1768", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2013-1768", "resource_type": "book_section", "pub_year": "2013", "author_list": "Ning, Xin and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/8bxnc-twh41", "eprint_id": 97969, "eprint_status": "archive", "datestamp": "2023-08-19 19:31:30", "lastmod": "2023-10-18 16:55:33", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wilson-Lee-L", "name": { "family": "Wilson", "given": "Lee" }, "orcid": "0000-0002-5865-9903" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Danner-R", "name": { "family": "Danner", "given": "Rolf" } } ] }, "title": "Origami Sunshield Concepts for Space Telescopes", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2013 American Institute of Aeronautics and Astronautics.", "abstract": "This paper presents two origami inspired concepts for sunshields for a deployable X-ray space telescope. Analytical models of the fold layout and sunshield deployment have been derived, and these models have been used to match the sunshield design to a set of geometric constraints. To validate the design, a proof-of-concept physical model of the optimized analytical design was constructed at 1:10 scale.", "date": "2013-04-08", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2013-1594", "id_number": "CaltechAUTHORS:20190816-144340816", "isbn": "9781624102233", "book_title": "54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144340816", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2013-1594", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2013-1594", "resource_type": "book_section", "pub_year": "2013", "author_list": "Wilson, Lee; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/4j0yh-wfp59", "eprint_id": 97968, "eprint_status": "archive", "datestamp": "2023-08-19 19:31:22", "lastmod": "2023-10-18 16:55:30", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Steeves-J", "name": { "family": "Steeves", "given": "John" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Ultra-Thin Highly Deformable Composite Mirrors", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2013 American Institute of Aeronautics and Astronautics. \n\nWe thank Gilles Rocher and Thomas Ricard (North Thin-Ply Technologies) for providing materials for this research and Professor Paolo Ermanni (ETH Zurich) for advice on actuator concepts and development. We also thank Keith Patterson (Caltech) for advice regarding the fabrication processes. Financial support has been provided by the Dow Resnick Bridge program at Caltech and the Natural Sciences and Engineering Research Council of Canada.", "abstract": "Optical quality mirrors are heavy, expensive and difficult to manufacture. This paper presents a novel mirror concept based on an active laminate consisting of an ultra-thin carbon-fiber shell bonded to a piezo-ceramic active layer coated with patterned electrodes. Mirrors based on this concept are less than 1 mm thick and hence are very lightweight and flexible. They also have a large dynamic range of actuation that allows them to take up a wide range of deformed configurations. This concept is compatible with relatively high-volume manufacturing processes and can potentially achieve a significant reduction in cost in comparison to currently available active mirrors. It is also suitable for applications ranging from concentrators for solar power generation to primary mirrors for optical telescopes. The paper presents an overview of the mirror components as well as a simple design relationship for sizing the active layer. The expected performance of a preliminary design for a 1 m diameter mirror with a radius of curvature of 15 m is computed numerically, showing that a set of 96 actuators can remove an edge-to-edge manufacturing-induced cylindrical curvature of 5 mm to an RMS accuracy of 50 \u03bcm. The prescription of the mirror can also be adjusted to a radius of curvature of 11 m with an accuracy of 160 \u03bcm. The development and characterization of a proof-of-concept prototype mirror is also presented.", "date": "2013-04-08", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2013-1523", "id_number": "CaltechAUTHORS:20190816-144340709", "isbn": "9781624102233", "book_title": "54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190816-144340709", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Dow Resnick Bridge Program" }, { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" } ] }, "other_numbering_system": { "items": [ { "id": "2013-1523", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2013-1523", "resource_type": "book_section", "pub_year": "2013", "author_list": "Steeves, John and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/45wtc-6tz14", "eprint_id": 42601, "eprint_status": "archive", "datestamp": "2023-08-19 19:26:01", "lastmod": "2023-10-25 16:56:01", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Olson-G-M", "name": { "family": "Olson", "given": "Gina M." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Banik-J", "name": { "family": "Banik", "given": "Jeremy" } }, { "id": "Constantine-J", "name": { "family": "Constantine", "given": "Joseph" } } ] }, "title": "Deployable Helical Antennas for CubeSats", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2013 American Institute of Aeronautics and Astronautics. \n\nSupport from the Air Force Research Laboratory Summer Space Scholars Program and AFOSR (award no. FA9550-13-1-0061, program manager Dr David Stargel) is gratefully acknowledged.\n\nAccepted Version - DeployableHelicalAntennaforCubeSatsFinal.pdf
", "abstract": "This paper explores the behavior of a self-deploying helical pantograph antenna for CubeSats. The helical pantograph concept is described along with concepts for attachment to the satellite bus. Finite element folding simulations of a pantograph consisting of eight helices are presented and compared to compaction force experiments done on a prototype antenna. Reflection coefficient test are also presented, demonstrating the operating frequency range of the prototype antenna. The helical pantograph is shown to be a promising alternative to current small satellite antenna solutions.", "date": "2013-04", "date_type": "published", "publisher": "AIAA", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 1671", "id_number": "CaltechAUTHORS:20131120-152814552", "isbn": "978-1-62410-223-3", "book_title": "54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131120-152814552", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Research Laboratory (AFRL)" }, { "agency": "Air Force Office of Scientific Research (AFOSR)", "grant_number": "FA9550-13-1-0061" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2013-1671", "primary_object": { "basename": "DeployableHelicalAntennaforCubeSatsFinal.pdf", "url": "https://authors.library.caltech.edu/records/45wtc-6tz14/files/DeployableHelicalAntennaforCubeSatsFinal.pdf" }, "resource_type": "book_section", "pub_year": "2013", "author_list": "Olson, Gina M.; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/01wrq-rjq45", "eprint_id": 100344, "eprint_status": "archive", "datestamp": "2023-08-19 11:21:49", "lastmod": "2023-10-18 19:52:28", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mallikarachchi-H-M-Y-C", "name": { "family": "Mallikarachchi", "given": "H. M. Y. C." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Deployment Dynamics of Composite Booms with Integral Slotted Hinges", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2009 by H.M.Y.C. Mallikarachchi and S. Pellegrino. Published by American Institute of Aeronautics and Astronautics, Inc. \n\nPublished Online: 14 Jun 2012. \n\nWe thank Drs Ahmad Kueh, Julian Santiago Prowald and Michael Sutcliffe for helpful discussions. We are grateful to John Ellis (Hexcel, UK) for providing materials and Professor Chiara Daraio, Dr Alessandro Spadoni and Tian Lan for help with high speed imaging. HM thanks the Cambridge Commonwealth Trust and California Institute of Technology for financial support.\n\nPublished - Mallikarachchi_SDM09.pdf
", "abstract": "This paper considers a lightweight boom with an integral hinge consisting of a thin-walled tube made of carbon fibre reinforced plastic with two longitudinal slots. The dynamic deployment of this boom is studied both experimentally and by means of detailed finite-element simulations. The deployment of the boom can be divided into three phases: deployment; incomplete latching, buckling of the tape springs and large rotation of the boom; and vibration of the boom in latched configuration. The simulations show that the most critical phase is the second one, as the highest strains in both the fibres and the matrix occur at this stage. Through the simulations it is found that the deployment of the particular boom design studied in this paper is quite sensitive to the details of the gravity offload system.", "date": "2012-06-14", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2009-2631", "id_number": "CaltechAUTHORS:20191218-095027064", "isbn": "978-1-60086-975-4", "book_title": "50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191218-095027064", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Cambridge Commonwealth Trust" }, { "agency": "Caltech" } ] }, "other_numbering_system": { "items": [ { "id": "2009-2631", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2009-2631", "primary_object": { "basename": "Mallikarachchi_SDM09.pdf", "url": "https://authors.library.caltech.edu/records/01wrq-rjq45/files/Mallikarachchi_SDM09.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Mallikarachchi, H. M. Y. C. and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/8r47x-j3708", "eprint_id": 100348, "eprint_status": "archive", "datestamp": "2023-08-19 11:21:54", "lastmod": "2023-10-18 19:52:40", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lopez-Jimenez-F", "name": { "family": "Lopez Jimenez", "given": "Francisco" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Folding of Thin Composite Structures with a Soft Matrix", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2009 by Francisco Lopez Jimenez and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc.\n\nPublished Online: 14 Jun 2012.\n\nPublished - folding_of_thin_composite_structures_with_a_soft_matrix.pdf
", "abstract": "The paper presents detailed micromechanical finite element simulations of composite materials with soft materials undergoing large macroscopic bending deformation. The simulations allow the study of fibre microbuckling under bending, including the kinematics of the fibres, as well as the strains in the matrix. These simulations lead to a simple analytical model that allows a quite accurate estimation of the buckling wavelength. It also provides the moment-curvature relationship. Finally, the model is also able to predict the maximum strain in the fibres for a given curvature.", "date": "2012-06-14", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2009-2633", "id_number": "CaltechAUTHORS:20191218-112129907", "isbn": "978-1-60086-975-4", "book_title": "50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191218-112129907", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2009-2633", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2009-2633", "primary_object": { "basename": "folding_of_thin_composite_structures_with_a_soft_matrix.pdf", "url": "https://authors.library.caltech.edu/records/8r47x-j3708/files/folding_of_thin_composite_structures_with_a_soft_matrix.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Lopez Jimenez, Francisco and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/4mcdv-8th68", "eprint_id": 98710, "eprint_status": "archive", "datestamp": "2023-08-19 11:17:59", "lastmod": "2023-10-18 17:35:20", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Deng-Xiaowei", "name": { "family": "Deng", "given": "X." } } ] }, "title": "A Technique to Predict Clefting of Lobed Super-Pressure Balloons", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 4 Jun 2012.", "abstract": "Lobed super-pressure balloons have shown a tendency to deploy into unexpected asymmetric shapes, hence their design has to strike a balance between the lowest stresses achieved by increasing lobing and the risk of incomplete deployment. This paper proposes a computational clefting test that can be applied to any given balloon design. The test consists in setting up the balloon in its symmetrically inflated configuration, then breaking the symmetry of this shape by artificially introducing a clefting imperfection, and finally determining the equilibrium shape of the balloon. Wrinkling of the balloon film and frictionless contact are included in the computation. The clefting test is applied successfully to three 27 m diameter super-pressure balloons that have been tested indoors by NASA, of which one had remained clefted when it was inflated and the other two had deployed completely.", "date": "2012-06-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-6830", "id_number": "CaltechAUTHORS:20190918-090257435", "isbn": "978-1-60086-941-9", "book_title": "11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190918-090257435", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2011-6830", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2011-6830", "resource_type": "book_section", "pub_year": "2012", "author_list": "Pellegrino, S. and Deng, X." }, { "id": "https://authors.library.caltech.edu/records/p82e6-tge49", "eprint_id": 98712, "eprint_status": "archive", "datestamp": "2023-08-19 11:18:02", "lastmod": "2023-10-18 17:35:25", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kwok-Kawai", "name": { "family": "Kwok", "given": "Kawai" }, "orcid": "0000-0001-6876-4267" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Large Strain Viscoelastic Model for Balloon Film", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 American Institute of Aeronautics and Astronautics. \n\nPublished Online: 4 Jun 2012.", "abstract": "This paper presents a constitutive model capable of predicting the anisotropic viscoelastic behavior of balloon film subject to large strains and cyclic loading. The model is based on the free volume theory of nonlinear viscoelasticity enhanced with a switching rule for treating loading and unloading differently. The model has been implemented in the finite element analysis program Abaqus/Standard and the results have been compared with experiments on the balloon film StratoFilm 420 under biaxial tension and shear.", "date": "2012-06-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-6939", "id_number": "CaltechAUTHORS:20190918-093409950", "isbn": "978-1-60086-941-9", "book_title": "11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190918-093409950", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2011-6939", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2011-6939", "resource_type": "book_section", "pub_year": "2012", "author_list": "Kwok, Kawai and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/bqsjj-pey95", "eprint_id": 98305, "eprint_status": "archive", "datestamp": "2023-08-19 10:42:28", "lastmod": "2023-10-18 17:14:18", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Maqueda-I", "name": { "family": "Maqueda", "given": "I." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Mejia-Ariza-J-M", "name": { "family": "Mejia-Ariza", "given": "J. M." } } ] }, "title": "Characterization of a high strain composite material", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 by Ignacio Maquadea and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.\n\nThe material fabrication and characterization study presented in this paper was funded by NASA JPL under the SBIR-Phase 1 \"Thermally-Stable High Strain Deployable Structures\". The material development and manufacture of the Miura-ori composite lamina shown in Figure 1 were done under internal R&D funded by L'Garde, Inc. IM thanks the Fulbright Foundation for financial support.\n\nAccepted Version - Maqueda_2012.pdf
", "abstract": "L'Garde has designed and developed a high-strain composite material consisting of car- bon FIbers embedded in a silicone matrix. The behavior of this material is significantly different from standard composites and the paper presents special test methods to measure the properties of this material. It is found that rule of mixtures estimates are quite accurate for the longitudinal moduli in tension and bending, but less accurate for compression. The Poisson's ratio prediction is also not accurate. Regarding the strength of the composite, it is found that conservative predictions of tensile and compressive strengths can be obtained respectively from the Weibull distribution of the strength of a single fiber combined with a simple bundle theory, and the elastic fiber microbuckling stress.", "date": "2012-04-23", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2012-1909", "id_number": "CaltechAUTHORS:20190828-102318305", "isbn": "9781600869372", "book_title": "53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190828-102318305", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL" }, { "agency": "L'Garde, Inc." }, { "agency": "Fulbright Foundation" } ] }, "other_numbering_system": { "items": [ { "id": "2012-1909", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2012-1909", "primary_object": { "basename": "Maqueda_2012.pdf", "url": "https://authors.library.caltech.edu/records/bqsjj-pey95/files/Maqueda_2012.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Maqueda, I.; Pellegrino, S.; et el." }, { "id": "https://authors.library.caltech.edu/records/v95p5-r5v15", "eprint_id": 98221, "eprint_status": "archive", "datestamp": "2023-08-19 10:42:18", "lastmod": "2023-10-18 17:09:49", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ning-Xin", "name": { "family": "Ning", "given": "Xin" }, "orcid": "0000-0002-9432-3665" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Design of Lightweight Structural Components for Direct Digital Manufacturing", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 by Xin Ning and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics with permission. \n\nWe thank Ted Nye for inspiring this research and gratefully acknowledge the financial support received from Northrop Grumman Aerospace Systems.\n\nPublished - NingAIAA2012.pdf
", "abstract": "The rapid growth in direct digital manufacturing technologies has opened the challenge of designing optimal micro-structures for high-performance components. Current topology optimization techniques do not work well for this type of problems and hence in this paper we propose a technique based on an implicit representation of the structural topology. The detailed microstructure is defined by a continuous variable, the size distribution field, defined over the design domain by chosen shape functions. We can optimize the structural topology by optimizing only the weights of the size distribution field and, for any given size distribution, we use standard meshing software to determine the actual detailed micro-structure. We have implemented the optimization loop using commercial CAD and FEA software, running under a genetic algorithm in MATLAB. Application this novel technique to the design of a sandwich beam has produced designs that are superior to any standard solid beam or even optimized truss structure.", "date": "2012-04-23", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2012-1807", "id_number": "CaltechAUTHORS:20190826-092412796", "isbn": "9781600869372", "book_title": "53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190826-092412796", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Northrop Grumman Aerospace Systems" } ] }, "other_numbering_system": { "items": [ { "id": "2012-1807", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2012-1807", "primary_object": { "basename": "NingAIAA2012.pdf", "url": "https://authors.library.caltech.edu/records/v95p5-r5v15/files/NingAIAA2012.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Ning, Xin and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/d8mq3-p0a83", "eprint_id": 98306, "eprint_status": "archive", "datestamp": "2023-08-19 10:42:33", "lastmod": "2023-10-18 17:14:20", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kwok-Kawai", "name": { "family": "Kwok", "given": "Kawai" }, "orcid": "0000-0001-6876-4267" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Micromechanical modeling of deployment and shape recovery of thin-walled viscoelastic composite space structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 by Kawai Kwok and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nThe authors are grateful to Professor Wolfgang Knauss at the California Institute of Technology for helpful comments and Gary Patz at Patz Materials Technologies for providing materials used for the present study. Financial support for Kawai Kwok by the Croucher Foundation is acknowledged.\n\nAccepted Version - Full.pdf
", "abstract": "The first part of the paper presents an experimental study of the deployment and shape recovery of composite tape-springs after stowage at an elevated temperature. It is found that tape-springs deploy quickly and with a slight overshoot, but complete recovery takes place asymptotically over time. Stowage has the effect of slowing down both the shortterm deployment and long-term shape recovery. The second part of the paper presents a micromechanical finite element homogenization scheme to determine the effective viscoelastic properties of woven composite laminas. This solution scheme is employed in numerical simulations of deployment and shape recovery of composite tape-springs. The proposed micromechanical model predicts both the short-term deployment and long-term shape recovery response with close agreement to the experimental measurements.", "date": "2012-04-23", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2012-1910", "id_number": "CaltechAUTHORS:20190828-102318423", "isbn": "9781600869372", "book_title": "53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190828-102318423", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Croucher Foundation" } ] }, "other_numbering_system": { "items": [ { "id": "2012-1910", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2012-1910", "primary_object": { "basename": "Full.pdf", "url": "https://authors.library.caltech.edu/records/d8mq3-p0a83/files/Full.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Kwok, Kawai and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/0t9zy-4ff96", "eprint_id": 98222, "eprint_status": "archive", "datestamp": "2023-08-19 10:42:23", "lastmod": "2023-10-18 17:09:52", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Olson-G-M", "name": { "family": "Olson", "given": "Gina M." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Costantine-J", "name": { "family": "Costantine", "given": "Joseph" } }, { "id": "Banik-J", "name": { "family": "Banik", "given": "Jeremy" } } ] }, "title": "Structural Architectures for a Deployable Wideband UHF Antenna", "ispublished": "unpub", "full_text_status": "public", "note": "This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States.\n\nPublished - OlsonAIAA2012.pdf
", "abstract": "This paper explores concepts for a wideband deployable antenna suitable for small satellites. The general approach taken was to closely couple antenna theory and structural mechanics, to produce a deployable antenna that is considered efficient in both fields. Approaches that can be deployed using stored elastic strain energy have been favored over those that require powered actuators or environmental effects to enforce deployment. Two types of concepts were developed: thin shell structure and pantograph. These concepts cover four antenna topologies: crossed log periodic, conical log spiral, helical and quadrifilar helix. Of these, the conical log spiral antenna and the accompanying deployment concepts are determined to be the most promising approaches that warrant further study.", "date": "2012-04-23", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2012-1836", "id_number": "CaltechAUTHORS:20190826-092412894", "isbn": "9781600869372", "book_title": "53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190826-092412894", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2012-1836", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2012-1836", "primary_object": { "basename": "OlsonAIAA2012.pdf", "url": "https://authors.library.caltech.edu/records/0t9zy-4ff96/files/OlsonAIAA2012.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Olson, Gina M.; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/zmhnv-3cg92", "eprint_id": 65050, "eprint_status": "archive", "datestamp": "2023-08-19 10:33:43", "lastmod": "2023-10-17 23:09:17", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Patterson-K", "name": { "family": "Patterson", "given": "Keith" } }, { "id": "Yamamoto-Namiko", "name": { "family": "Yamamoto", "given": "Namiko" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Thin deformable mirrors for a reconfigurable space telescope", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2012 AIAA. \n\nWe thank Eleftherious Gdoutos for establishing the early fabrication effort, and Dr. Harish Manohara (JPL) for providing access to JPL Microdevices Lab (MDL) cleanroom facilities for sample fabrication. We also thank Drs. Risaku Toda and Victor White (JPL) for assistance and advice on sample fabrication. The students in the Caltech Ae105 class contributed greatly to the mission telescope concept design, and we would like to acknowledge their efforts here. We also thank Dr. Jim Breckinridge for helpful discussions on telescope design, John Steeves, Prof. Chiara Daraio (Caltech), and Dr. Andrew Shapiro (JPL) also for help and advice regarding the fabrication of prototype mirrors. We also appreciate the fabrication facilities provided by the Molecular Materials Research Center and Kavli Nanoscience Institute at Caltech. Financial support from the Keck Institute of Space Studies (KISS) at Caltech is gratefully acknowledged.\n\nSubmitted - thin_deformable.pdf
", "abstract": "As part of a small satellite technology demonstration that will utilize autonomous assembly, reconfiguration, and docking technology to form the primary mirror for the mission's telescope payload, the mirror segments are required to modify and control their shape, in order to allow for imaging in different configurations. This paper focuses on the development of 10 cm diameter active lightweight mirrors. The current mirror design, control scheme, and fabrication methods are described, as well as experimental results on initial samples. The data demonstrates that the mirrors are capable of at least 100 microns of displacement during operation, and that fabrication on polished molds can result in high quality reflective surfaces.", "date": "2012-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2012-1668", "id_number": "CaltechAUTHORS:20160303-153240359", "isbn": "978-1-60086-937-2", "book_title": "53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160303-153240359", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "other_numbering_system": { "items": [ { "id": "2012-1668", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "Keck-Institute-for-Space-Studies" }, { "id": "Kavli-Nanoscience-Institute" }, { "id": "GALCIT" } ] }, "doi": "10.2514/6.2012-1668", "primary_object": { "basename": "thin_deformable.pdf", "url": "https://authors.library.caltech.edu/records/zmhnv-3cg92/files/thin_deformable.pdf" }, "resource_type": "book_section", "pub_year": "2012", "author_list": "Patterson, Keith; Yamamoto, Namiko; et el." }, { "id": "https://authors.library.caltech.edu/records/c451j-zqp91", "eprint_id": 99102, "eprint_status": "archive", "datestamp": "2023-08-19 07:58:31", "lastmod": "2023-10-18 17:51:33", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lappas-V", "name": { "family": "Lappas", "given": "V." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Guenat-H", "name": { "family": "Guenat", "given": "H." } }, { "id": "Straubel-M", "name": { "family": "Straubel", "given": "M." } }, { "id": "Steyn-H", "name": { "family": "Steyn", "given": "H." } }, { "id": "Kostopoulos-V", "name": { "family": "Kostopoulos", "given": "V." } }, { "id": "Sarris-E", "name": { "family": "Sarris", "given": "E." } }, { "id": "Takinalp-O", "name": { "family": "Takinalp", "given": "O." } }, { "id": "Wokes-S", "name": { "family": "Wokes", "given": "S." } }, { "id": "Bonnema-A", "name": { "family": "Bonnema", "given": "A." } } ] }, "title": "DEORBITSAIL: De-orbiting of satellites using solar sails", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 2011 IEEE.", "abstract": "Historical practice of abandoning satellites at the end of their lifetime has left 8,500 tonnes of space waste in Low Earth Orbit. In the future, this practice must change. DEORBIT SAIL proposes an innovative system, allowing the safe de-orbiting of spacecraft at the end of their lifetime. Increasingly, space debris poses a risk for spacecraft. Hundreds of old satellites and thousands of pieces of space junk orbit Earth. Such debris collide, which in turn increases the amount of debris, as pieces of old satellites break of when hit by pieces of other retired spacecraft. Indeed, without a change of practice and the establishment of effective systems for safe de-orbiting of spacecraft at the end of their lifetime, it is estimated that the number of debris particles will grow with a growth rate in the order of 5 percent per year - a percentage which would raise over time as the number of possible collisions increase. The DEORBITSAIL project addresses this challenge, as it is set to develop a novel low cost low risk de-orbiting device for smaller spacecraft with a mass less than 500 kg that circulate Earth in Low Earth Orbit less than 900 km above us. DEORBITSAIL proposes to develop a 25 square metre Solar Sail, which would weight no more than 3 kg. Upon the end of its lifetime, the retired spacecraft would deploy this sail. Within 25 years, drag will drive the spacecraft downwards, taking the spacecraft home into Earth's atmosphere, where it would burn off safely. The 25 year de-orbiting period adheres to established recommendations by the European Space Agency (ESA), and deployed on all new small size spacecraft. DEORBITSAIL has the potential to reduce future debris by 70 percent. DEORBITSAIL is a fully funded space mission, sponsored by the EU FP7 program.", "date": "2011-09", "date_type": "published", "publisher": "IEEE", "place_of_pub": "Piscataway, NJ", "pagerange": "1-3", "id_number": "CaltechAUTHORS:20191004-152131563", "isbn": "9781457718748", "book_title": "2011 2nd International Conference on Space Technology", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191004-152131563", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.1109/icspt.2011.6064667", "resource_type": "book_section", "pub_year": "2011", "author_list": "Lappas, V.; Pellegrino, S.; et el." }, { "id": "https://authors.library.caltech.edu/records/sahgt-6qd66", "eprint_id": 98940, "eprint_status": "archive", "datestamp": "2023-08-19 06:10:12", "lastmod": "2023-10-18 17:44:49", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mallikarachchi-H-M-Y-C", "name": { "family": "Mallikarachchi", "given": "H. M. Y. C." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Design and Validation of Thin-Walled Composite Deployable Booms with Tape-Spring Hinges", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2011 by H. M. Y. C. Mallikarachchi and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nWe thank Dr Michael Sutcliffe for helpful discussions and Professor Chiara Daraio and Dr Jinkyu Yang for help with high speed imaging. John Ellis (Hexcel, UK) kindly provided materials for our experiments. HM thanks the Cambridge Commonwealth Trust and the California Institute of Technology for financial support.\n\nAccepted Version - MallikarachchiAIAA2011.pdf
", "abstract": "This paper presents a 1 m long self-deployable boom that could be folded around a spacecraft. Previously developed simulation techniques are used to analyze this two-hinge boom, made from two-ply plain weave carbon fiber laminate. A stress-resultant based failure criterion is used to study safety of the structure during both stowage and dynamic deployment. A safe design that latches without any overshoot is selected and validated by a dynamic deployment experiment.", "date": "2011-04-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-2019", "id_number": "CaltechAUTHORS:20190930-110458726", "isbn": "9781600869518", "book_title": "52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190930-110458726", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Cambridge Commonwealth Trust" }, { "agency": "Caltech" } ] }, "other_numbering_system": { "items": [ { "id": "2011-2019", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2011-2019", "primary_object": { "basename": "MallikarachchiAIAA2011.pdf", "url": "https://authors.library.caltech.edu/records/sahgt-6qd66/files/MallikarachchiAIAA2011.pdf" }, "resource_type": "book_section", "pub_year": "2011", "author_list": "Mallikarachchi, H. M. Y. C. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/p1qec-p2a92", "eprint_id": 98942, "eprint_status": "archive", "datestamp": "2023-08-19 06:10:21", "lastmod": "2023-10-18 17:44:54", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Stohlman-O-R", "name": { "family": "Stohlman", "given": "O. R." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Effects of Component Properties on the Accuracy of a Joint-Dominated Deployable Mast", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2011 by Sergio Pellegrino and Olive Stohlman. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.\n\nAccepted Version - StohlmanAIAA2011.pdf
", "abstract": "Jointed-dominated deployable masts are used in space applications, including telescopes, where there is a demand for a long, slender structure that can be packed into a conven-tional launch shroud. Depending on the application, there may be stringent demands on the stiffness and shape accuracy of the mast. This paper presents a parametric study of the significance of a number of mast part properties for a precision deployable mast's perfor-mance under quasi-static shear load. The mast's cable preload, latching system behavior, and joint friction are explored as candidates for parts requiring detailed characterization for accurate mast performance prediction.", "date": "2011-04-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-2163", "id_number": "CaltechAUTHORS:20190930-110458917", "isbn": "9781600869518", "book_title": "52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190930-110458917", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2011-2163", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2011-2163", "primary_object": { "basename": "StohlmanAIAA2011.pdf", "url": "https://authors.library.caltech.edu/records/p1qec-p2a92/files/StohlmanAIAA2011.pdf" }, "resource_type": "book_section", "pub_year": "2011", "author_list": "Stohlman, O. R. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/tpkpq-szv03", "eprint_id": 98931, "eprint_status": "archive", "datestamp": "2023-08-19 06:10:07", "lastmod": "2023-10-18 17:44:27", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Patterson-K", "name": { "family": "Patterson", "given": "Keith" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Shape Correction of Thin Mirrors", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2011 by Keith Patterson and Sergio Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nWe thank Jim Breckinridge for helpful discussions of telescope design and Chiara Daraio, Eleftherios Gdoutos, and Andrew Shapiro for help and advice regarding the fabrication of a prototype. Financial support from the Keck Institute of Space Studies at Caltech is gratefully acknowledged.\n\nAccepted Version - Shape_correction_of_thin_mirrors_2011.pdf
", "abstract": "Future large space observatories will require large apertures to provide better resolution and greater light gathering power; thin mirror technologies provide one possible route for addressing this need. This paper presents a study of a 10 m diameter sparse aperture based on a collection of thin, active mirror segments with identical initial shapes. A preliminary design for a 1 m diameter mirror segment is proposed and an investigation into the performance of this design is carried out utilizing finite element modeling tools. The results indicate that it is possible to adapt the generic segment shapes to fit the local mirror shape, and achieve near diffraction-limited performance through the use of lightweight, surface-parallel actuators. These actuators may also be used for thermal compensation. Additionally, a design for a scaled 10 cm diameter prototype mirror to test and validate the envisioned scheme is presented.", "date": "2011-04-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-1827", "id_number": "CaltechAUTHORS:20190930-110457762", "isbn": "9781600869518", "book_title": "52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190930-110457762", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "other_numbering_system": { "items": [ { "id": "2011-1827", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" }, { "id": "Keck-Institute-for-Space-Studies" } ] }, "doi": "10.2514/6.2011-1827", "primary_object": { "basename": "Shape_correction_of_thin_mirrors_2011.pdf", "url": "https://authors.library.caltech.edu/records/tpkpq-szv03/files/Shape_correction_of_thin_mirrors_2011.pdf" }, "resource_type": "book_section", "pub_year": "2011", "author_list": "Patterson, Keith and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/qdmk2-8w128", "eprint_id": 98941, "eprint_status": "archive", "datestamp": "2023-08-19 06:10:17", "lastmod": "2023-10-18 17:44:51", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kwok-Kawai", "name": { "family": "Kwok", "given": "Kawai" }, "orcid": "0000-0001-6876-4267" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Viscoelastic effects in tape-springs", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2011 by K. Kwok and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nThe authors are grateful to Professor Wolfgang Knauss for helpful comments and discussions. Financial support for KK by the Croucher Foundation is acknowledged.\n\nAccepted Version - KwokAIAA2011.pdf
", "abstract": "Following recent interest in constructing large self-deployable structures made of reinforced polymer materials, this paper presents a detailed study of viscoelastic effects in folding, stowage, and deployment of tape-springs which often act as deployment actuators in space structures. Folding and stowage behavior at different temperatures and rates are studied. It is found that the peak load increases with the folding rate but reduces with temperature. It is also shown that a load reduction of as much as 60% is possible during stowage due to relaxation behavior. Deployment behavior after significant load relaxation demonstrates features distinct from elastic tape-springs. It starts with a short dynamic response, followed by a quasi-static deployment, and ends with a slow creep recovery process. A key feature is that the localized fold stays stationary throughout deployment. Finite element simulations that incorporate an experimentally characterized viscoelastic material model are presented and found to capture the folding and stowage behavior accurately. The general features of deployment response are also predicted, but with larger discrepancy.", "date": "2011-04-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2011-2022", "id_number": "CaltechAUTHORS:20190930-110458819", "isbn": "9781600869518", "book_title": "52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190930-110458819", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Croucher Foundation" } ] }, "other_numbering_system": { "items": [ { "id": "2011-2022", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2011-2022", "primary_object": { "basename": "KwokAIAA2011.pdf", "url": "https://authors.library.caltech.edu/records/qdmk2-8w128/files/KwokAIAA2011.pdf" }, "resource_type": "book_section", "pub_year": "2011", "author_list": "Kwok, Kawai and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/1pkct-w6157", "eprint_id": 22999, "eprint_status": "archive", "datestamp": "2023-08-22 00:35:05", "lastmod": "2024-01-13 05:13:06", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Patterson-K", "name": { "family": "Patterson", "given": "Keith" } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" }, { "id": "Breckinridge-J-B", "name": { "family": "Breckinridge", "given": "James" }, "orcid": "0000-0002-9488-098X" } ] }, "title": "Shape correction of thin mirrors in a reconfigurable modular space telescope", "ispublished": "unpub", "full_text_status": "public", "keywords": "thin mirrors; segmented telescopes; shape correction; image quality", "note": "\u00a9 2010 SPIE.\n\nThis research was sponsored by the Keck Institute for Space Studies (KISS). We would like to thank Dr Mark\nLake and Dr Matt Mountain for stimulating comments during the initial formulation of the concepts presented\nin this paper. Professor Chiara Daraio and Dr Abha Misra have kindly allowed us to present some early results\nfrom their research on low CTE, bimetallic mirror films. The nanosatellite mission proposed in Section 4 is\na collaboration between Caltech and the University of Surrey. We acknowledge the contribution of Dr Craig\nUnderwood (University of Surrey, UK) to the formulation of this mission concept.\n\nPublished - Patterson2010p13182Adaptive_Optics_Systems_Pts_1-3.pdf
", "abstract": "In order to facilitate the construction of future large space telescopes, the development of low cost, low mass\nmirrors is necessary. However, such mirrors suffer from a lack of structural stability, stiffness, and shape accuracy.\nActive materials and actuators can be used to alleviate this deficiency. For observations in the visible wavelengths,\nthe mirror surface must be controlled to an accuracy on the order of tens of nanometers. This paper presents\nan exploration of several mirror design concepts and compares their effectiveness at providing accurate shape\ncontrol. The comparison test is the adjustment of a generic mirror from its manufactured spherical shape to the\nshape required by various off-axis mirrors in a segmented primary mirror array. A study of thermal effects is\nalso presented and, from these results, a recommended design is chosen.", "date": "2010-08-10", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "Art. No. 773121", "id_number": "CaltechAUTHORS:20110321-085232350", "isbn": "978-0-81948-221-1", "book_title": "Space telescopes and instrumentation 2010 : optical, infrared, and millimeter wave", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110321-085232350", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Keck Institute for Space Studies (KISS)" } ] }, "local_group": { "items": [ { "id": "Keck-Institute-for-Space-Studies" }, { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Oschmann-J-M", "name": { "family": "Oschmann", "given": "Jacobus M." } }, { "id": "Clampin-M-C", "name": { "family": "Clampin", "given": "Mark C." } }, { "id": "MacEwen-H-A", "name": { "family": "MacEwen", "given": "Howard A." } } ] }, "doi": "10.1117/12.861442", "primary_object": { "basename": "Patterson2010p13182Adaptive_Optics_Systems_Pts_1-3.pdf", "url": "https://authors.library.caltech.edu/records/1pkct-w6157/files/Patterson2010p13182Adaptive_Optics_Systems_Pts_1-3.pdf" }, "resource_type": "book_section", "pub_year": "2010", "author_list": "Patterson, Keith; Pellegrino, Sergio; et el." }, { "id": "https://authors.library.caltech.edu/records/d5bry-t8186", "eprint_id": 99293, "eprint_status": "archive", "datestamp": "2023-08-19 02:08:40", "lastmod": "2023-10-18 18:12:47", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mallikarachchi-H-M-Y-C", "name": { "family": "Mallikarachchi", "given": "H. M. Y. C." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Optimized Designs of Composite Booms with Tape Spring Hinges", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2010 by H.M.Y.C Mallikarachchi and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.", "abstract": "This paper presents an optimization study of a lightweight hinge consisting of a thin walled tube made of carbon fiber reinforced plastic with two longitudinal slots. The slot geometry is parameterized in terms of slot length, width and end circle diameter. Previously developed numerical simulation techniques to analyze the folding and deployment of this kind of hinges are used to carry out a series of parametric studies. The maximum strains are estimated by using the mid-surface strain and curvature obtained from a macro model of the structure to a micro model and averaging the strains over a half a tow width in the micro model. A maximum strain failure criterion is used for failure analysis. The optimization study is focused on finding a hinge design that can be folded 180 deg with the shortest possible slot length. Simulations show that the maximum strains can be significantly reduced by allowing the end-cross sections to deform freely. Based on simulations a failure critical model and a failure safe model were selected and experimentally validated. The optimized design is six times stiffer in torsion, twice stiffer axially and stores two and a half times more strain energy than the previously considered design.", "date": "2010-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2010-2750", "id_number": "CaltechAUTHORS:20191016-092056718", "isbn": "978-1-60086-961-7", "book_title": "51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191016-092056718", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2010-2750", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2010-2750", "resource_type": "book_section", "pub_year": "2010", "author_list": "Mallikarachchi, H. M. Y. C. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/72dm2-bhb02", "eprint_id": 99290, "eprint_status": "archive", "datestamp": "2023-08-19 02:08:32", "lastmod": "2023-10-18 18:12:42", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Stohlman-O-R", "name": { "family": "Stohlman", "given": "O. R." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Shape Accuracy of a Joint-Dominated Deployable Mast", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2010 by O. Stohlman and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.\n\nAccepted Version - StohlmanAIAA2010.pdf
", "abstract": "This paper presents a study to capture and model friction related changes in the un-loaded configuration of deployable masts with articulated joints. A finite model of a rep-resentative mast structure is described. This model includes a detailed treatment of the latching mechanism. The parameters of the computational model are based on direct mea-surements on components of a physical model. The moment-rotation relationship for a complete single bay of the physical model has been measured and the overall behavior is predicted well by the model, however the model predicts the residual rotation at zero moment to be zero and so it is concluded that a more refined model for the latch will need to be developed.", "date": "2010-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2010-2605", "id_number": "CaltechAUTHORS:20191016-085828334", "isbn": "978-1-60086-961-7", "book_title": "51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191016-085828334", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2010-2605", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2010-2605", "primary_object": { "basename": "StohlmanAIAA2010.pdf", "url": "https://authors.library.caltech.edu/records/72dm2-bhb02/files/StohlmanAIAA2010.pdf" }, "resource_type": "book_section", "pub_year": "2010", "author_list": "Stohlman, O. R. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/qf3qy-hb666", "eprint_id": 99292, "eprint_status": "archive", "datestamp": "2023-08-19 02:08:37", "lastmod": "2023-10-18 18:12:44", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kwok-Kawai", "name": { "family": "Kwok", "given": "Kawai" }, "orcid": "0000-0001-6876-4267" }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "Sergio" }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Shape Recovery of Viscoelastic Deployable Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2010 by K. Kwok and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission.\n\nAccepted Version - KwokAIAA2010.pdf
", "abstract": "The paper investigates the shape recovery behavior of a simple beam and a tape spring made of LDPE under prescribed deformation history at room temperature. The linear viscoelastic material properties of LDPE were measured via creep tests. An analysis of a LDPE beam under four-point bending with an imposed history of vertical deflection and reaction force was performed. A theoretical solution was constructed by employing the Alfrey's Correspondence Principle to the Euler-Bernoulli beam equation. The result was validated against a four-point bending experiment and a detailed nonlinear finite element simulation. Excellent agreement was obtained between theory, experiments and numerical simulations. A LDPE tape spring was fabricated and tested to provide an example of a simple deployable structure that recovers its deployed shape through a viscoelastic process for both equal sense and opposite sense folding.", "date": "2010-04", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2010-2606", "id_number": "CaltechAUTHORS:20191016-090847709", "isbn": "978-1-60086-961-7", "book_title": "51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191016-090847709", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "other_numbering_system": { "items": [ { "id": "2010-2606", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2010-2606", "primary_object": { "basename": "KwokAIAA2010.pdf", "url": "https://authors.library.caltech.edu/records/qf3qy-hb666/files/KwokAIAA2010.pdf" }, "resource_type": "book_section", "pub_year": "2010", "author_list": "Kwok, Kawai and Pellegrino, Sergio" }, { "id": "https://authors.library.caltech.edu/records/j5q84-a3730", "eprint_id": 102166, "eprint_status": "archive", "datestamp": "2023-08-19 22:29:50", "lastmod": "2023-10-19 23:54:41", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Deng-Xiaowei", "name": { "family": "Deng", "given": "X." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Computation of Partially Inflated Shapes of Stratospheric Balloon Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2008 by X. Deng and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nWe thank the NASA ULDB team for their contribution to this research. In particular, we are grateful to Henry Cathey for kindly providing test data and Rodger Farley, Jim Rand and David Wakefield for helping us through numerous discussions This research was supported by the NASA Balloon Program Office (contract monitor Danny Ball).\n\nAccepted Version - DengAIAA2008.pdf
", "abstract": "This paper studies the relationship between height, volume and stress distribution in a superpressure pumpkin balloon with the differential pressure applied to the balloon. Two different approaches are presented. A simple two-dimensional solution based on previous work and a novel, detailed finite element simulation that provides three-dimensional solutions are investigated. It is found that the finite element solution provides a much better agreement with experimental results for the case of a flat facet ULDB balloon. It is also found that a region of tensile hoop stress remains in the crown region of the balloon until the bottom pressure becomes negative. This region prevents the formation of clefts in the balloon and keeps its shape axisymmetric.", "date": "2008-04-07", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2008-2133", "id_number": "CaltechAUTHORS:20200330-082659500", "isbn": "978-1-60086-993-8", "book_title": "49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 16th AIAA/ASME/AHS Adaptive Structures Conference, 10th AIAA Non-Deterministic Approaches Conference, 9th AIAA Gossamer Spacecraft Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200330-082659500", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" } ] }, "other_numbering_system": { "items": [ { "id": "2008-2133", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2008-2133", "primary_object": { "basename": "DengAIAA2008.pdf", "url": "https://authors.library.caltech.edu/records/j5q84-a3730/files/DengAIAA2008.pdf" }, "resource_type": "book_section", "pub_year": "2008", "author_list": "Deng, X. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/ata8h-dpk39", "eprint_id": 102165, "eprint_status": "archive", "datestamp": "2023-08-19 22:29:44", "lastmod": "2023-10-19 23:54:38", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Mallikarachchi-H-M-Y-C", "name": { "family": "Mallikarachchi", "given": "H. M. Y. C." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" } ] }, "title": "Simulation of Quasi-Static Folding and Deployment of Ultra-Thin Composite Structures", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 2008 by H.M.Y.C. Mallikarachchi and S. Pellegrino. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. \n\nWe thank Dr Ahmad Kueh and Dr Michael Sutcliffe for helpful discussions. We are grateful to Mr J. Ellis (Hexcel, UK) for providing materials. HM thanks the Cambridge Commonwealth Trust for financial support.\n\nAccepted Version - Mallikarachchi2008.pdf
", "abstract": "This paper presents a detailed study of the folding and deployment of a slotted tube hinge made from a two-ply laminate of carbon-fibre reinforced plastic. A physical model of a particular version of this binge has been used to carry out quasi-static deployment tests and this process has been fully captured through a finite element simulation. The first stage in this simulation was to generate the fully folded, strained configuration of the hinge. The second stage in the simulation was to gradually decrease the relative rotation between the ends until it became zero. By analysing the in-plane strains and out-of-plane curvatures in the folded configuration we have confirmed that the particular hinge design that has been studied could be folded without permanent damage.", "date": "2008-04-07", "date_type": "published", "publisher": "American Institute of Aeronautics and Astronautics", "place_of_pub": "Reston, VA", "pagerange": "Art. No. 2008-2053", "id_number": "CaltechAUTHORS:20200330-081459739", "isbn": "978-1-60086-993-8", "book_title": "49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 16th AIAA/ASME/AHS Adaptive Structures Conference, 10th AIAA Non-Deterministic Approaches Conference, 9th AIAA Gossamer Spacecraft Forum", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200330-081459739", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Cambridge Commonwealth Trust" } ] }, "other_numbering_system": { "items": [ { "id": "2008-2053", "name": "AIAA Paper" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "doi": "10.2514/6.2008-2053", "primary_object": { "basename": "Mallikarachchi2008.pdf", "url": "https://authors.library.caltech.edu/records/ata8h-dpk39/files/Mallikarachchi2008.pdf" }, "resource_type": "book_section", "pub_year": "2008", "author_list": "Mallikarachchi, H. M. Y. C. and Pellegrino, S." }, { "id": "https://authors.library.caltech.edu/records/yyths-79s58", "eprint_id": 87140, "eprint_status": "archive", "datestamp": "2023-08-20 06:30:33", "lastmod": "2024-01-14 20:14:53", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Corvasce-C", "name": { "family": "Corvasce", "given": "C." } }, { "id": "Spagnolo-V", "name": { "family": "Spagnolo", "given": "V." } }, { "id": "Scamarcio-G", "name": { "family": "Scamarcio", "given": "G." } }, { "id": "Lugar\u00e0-M", "name": { "family": "Lugar\u00e0", "given": "M." } }, { "id": "Adduci-F", "name": { "family": "Adduci", "given": "F." } }, { "id": "Ferrara-M", "name": { "family": "Ferrara", "given": "M." } }, { "id": "Sibilano-M", "name": { "family": "Sibilano", "given": "M." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Del-Guidice-M", "name": { "family": "Del Guidice", "given": "M." } }, { "id": "Re-M-G", "name": { "family": "Re", "given": "M. G." } } ] }, "title": "Quantum-well-laser mirror degradation investigated by microprobe optical spectroscopy", "ispublished": "unpub", "full_text_status": "public", "keywords": "diode laser, catastrophic optical damage (COD), Raman micro-probe spectroscopy, photoluminescence micro-probe spectroscopy", "note": "\u00a9 1995 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nThis work has been partially supported by Italian CNR (Research National Council).\n\nPublished - 360.pdf
", "abstract": "A study of facet degradation of InGaAs quantum well lasers is reported. We tune up a Raman and photoluminescence micro-probe technique for determining the crystal structure and the temperature profile of the cladding layer, in steps of approximately 1 micrometer, with a temperature resolution better than 1 degree Kelvin. The cladding layer composition and cross- section temperature profile have been monitored during operation. A clear correlation between the facet degradation and the type of protective coating is found.", "date": "1995-11-03", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "360-364", "id_number": "CaltechAUTHORS:20180614-161010885", "isbn": "0819420212", "book_title": "International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180614-161010885", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Consiglio Nazionale delle Ricerche (CNR)" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Svechnikov-S-V", "name": { "family": "Svechnikov", "given": "Sergey V." } }, { "id": "Valakh-M-Ya", "name": { "family": "Valakh", "given": "Mikhail Ya." } } ] }, "doi": "10.1117/12.226195", "primary_object": { "basename": "360.pdf", "url": "https://authors.library.caltech.edu/records/yyths-79s58/files/360.pdf" }, "resource_type": "book_section", "pub_year": "1995", "author_list": "Corvasce, C.; Spagnolo, V.; et el." }, { "id": "https://authors.library.caltech.edu/records/p8w6j-5rf39", "eprint_id": 86797, "eprint_status": "archive", "datestamp": "2023-08-20 04:21:29", "lastmod": "2024-01-14 20:14:23", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Goano-M", "name": { "family": "Goano", "given": "M." } }, { "id": "Torasso-E", "name": { "family": "Torasso", "given": "E." } }, { "id": "Montrosset-I", "name": { "family": "Montrosset", "given": "I." } }, { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Re-M", "name": { "family": "Re", "given": "M." } }, { "id": "Reichenbach-D", "name": { "family": "Reichenbach", "given": "D." } } ] }, "title": "Design of high-power ridge waveguide 980-nm pump lasers", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1994 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nThe autors acknowledge the contribution of Mr. L. Cicchelli in the development of the latest version of the simulator. M.G., E.T. and I.M. acknowledge the partial support from Camera di Commercio di Torino under Research Grant \"All-Optical Communication Networks\".\n\nPublished - 52.pdf
", "abstract": "The design of ridge waveguide semiconductor pump lasers poses particular simulation problems, since an accurate modeling of the electric and thermal effects and of the optical guiding capabilities is needed. We developed a model whose self-consistent application allows the evaluation of, among others, the threshold current of the lasing mode and the gain margin of the higher order modes, the P-I characteristic, the power coupled in the fiber, and the far field pattern. Particular attention is paid to the experimental verification of the transverse single mode operation region, and its evolution at high injection levels. The appropriate conditions for operation in the 150 - 200 mW single mode output power range have been found.", "date": "1994-06-01", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "52-63", "id_number": "CaltechAUTHORS:20180605-132224863", "isbn": "0-8194-1443-3", "book_title": "Laser Diode Technology and Applications VI", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180605-132224863", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Camera di Commercio di Torino" } ] }, "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Chen-Pei-Chuang", "name": { "family": "Chen", "given": "Pei Chuang" } }, { "id": "Johnson-L-A", "name": { "family": "Johnson", "given": "Lawrence A." } }, { "id": "Temkin-H", "name": { "family": "Temkin", "given": "Henryk" } } ] }, "doi": "10.1117/12.176643", "primary_object": { "basename": "52.pdf", "url": "https://authors.library.caltech.edu/records/p8w6j-5rf39/files/52.pdf" }, "resource_type": "book_section", "pub_year": "1994", "author_list": "Goano, M.; Torasso, E.; et el." }, { "id": "https://authors.library.caltech.edu/records/mt0r0-7a411", "eprint_id": 87139, "eprint_status": "archive", "datestamp": "2023-08-20 04:14:38", "lastmod": "2024-01-14 20:14:50", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Re-M-G", "name": { "family": "Re", "given": "M. G." } }, { "id": "Beoni-C", "name": { "family": "Beoni", "given": "C." } }, { "id": "Reichenbach-D", "name": { "family": "Reichenbach", "given": "D." } }, { "id": "Vidimari-F", "name": { "family": "Vidimari", "given": "F." } } ] }, "title": "Design of Al-free and Al-based InGaAs/GaAs strained quantum well 980-nm pump lasers including thermal behavior effects on E/O characteristics", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1994 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nThe authors are indebt to Prof. I.Montrosset, Dr. M.Goano and Mr. E.Torasso from Politecnico di Torino for their valuable suggestions, and all the Alcatel-Telettra Laser Laboratory staff for their help during the work.\n\nPublished - 20.pdf
", "abstract": "A 2D thermal simulator and a model to evaluate high power lasers characteristics have been developed. With these models it was possible to optimize cavity length of InGaAs/GaAs (Multiple) Quantum Well 980 nm lasers realized both with Al-based and Al-free confining layers. A comprehensive experimental investigation of the influence of cavity length and temperature on the laser emission wavelength has been performed. This allows a fine trimming of the devices to match the Erbium doped fiber absorption bandwidth.", "date": "1994-05-02", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "20-28", "id_number": "CaltechAUTHORS:20180614-160352068", "isbn": "081941445X", "book_title": "Design, Simulation, and Fabrication of Optoelectronic Devices and Circuits", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180614-160352068", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Armenise-M-N", "name": { "family": "Armenise", "given": "Mario Nicola" } } ] }, "doi": "10.1117/12.175004", "primary_object": { "basename": "20.pdf", "url": "https://authors.library.caltech.edu/records/mt0r0-7a411/files/20.pdf" }, "resource_type": "book_section", "pub_year": "1994", "author_list": "Pellegrino, S.; Re, M. G.; et el." }, { "id": "https://authors.library.caltech.edu/records/tw4wd-f1w64", "eprint_id": 86795, "eprint_status": "archive", "datestamp": "2023-08-20 04:14:33", "lastmod": "2024-01-14 20:14:18", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pellegrino-S", "name": { "family": "Pellegrino", "given": "S." }, "orcid": "0000-0001-9373-3278" }, { "id": "Pignataro-C", "name": { "family": "Pignataro", "given": "C." } }, { "id": "Caldironi-M", "name": { "family": "Caldironi", "given": "M." } }, { "id": "Dellagiovanna-M", "name": { "family": "Dellagiovanna", "given": "M." } }, { "id": "Vidimari-F", "name": { "family": "Vidimari", "given": "F." } }, { "id": "Carnera-A", "name": { "family": "Carnera", "given": "A." } }, { "id": "Gasparotto-A", "name": { "family": "Gasparotto", "given": "A." } } ] }, "title": "Disordering of InGaAs/GaAs strained quantum well structures induced by rare gas ion implantation", "ispublished": "unpub", "full_text_status": "public", "note": "\u00a9 1994 Society of Photo-Optical Instrumentation Engineers (SPIE). \n\nWe are deeply indebt to Dr. C. Frigeri, MASPEC Parma, for TEN measurements and to Dr. A. DiPaola for continuous help during the work.\n\nPublished - 38.pdf
", "abstract": "In this work we have investigated the effect of various implantation schemes on In(0.2)GaAs/GaAs/AlGaAs Single Quantum Well, where the implanted species are Argon and Helium, with doses in the range 1E12 to 1E14 at cm^2, at energy spanning 270 - 400 KeV and 30 to 50 KeV for Ar and He, respectively. Repetitive annealing processes were carried out between 735 and 870 degree(s)C and the interdiffusion was deduced by photoluminescence measurements. A maximum of 20 nm shift from He ion implanted Quantum Well with an high degree of reconstruction has been recorded, thus allowing the application of this disordering scheme for the realization of optoelectronic devices.", "date": "1994-05-02", "date_type": "published", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_pub": "Bellingham, WA", "pagerange": "38-48", "id_number": "CaltechAUTHORS:20180605-131242041", "isbn": "081941445X", "book_title": "Design, Simulation, and Fabrication of Optoelectronic Devices and Circuits", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180605-131242041", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "GALCIT" } ] }, "contributors": { "items": [ { "id": "Armenise-M-N", "name": { "family": "Armenise", "given": "Mario Nicola" } } ] }, "doi": "10.1117/12.175013", "primary_object": { "basename": "38.pdf", "url": "https://authors.library.caltech.edu/records/tw4wd-f1w64/files/38.pdf" }, "resource_type": "book_section", "pub_year": "1994", "author_list": "Pellegrino, S.; Pignataro, C.; et el." } ]