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Identification of nonlinear vibrating structures: Part II  Applications
https://resolver.caltech.edu/CaltechAUTHORS:MASjam87b
Authors: {'items': [{'id': 'MasriSF', 'name': {'family': 'Masri', 'given': 'S. F.'}}, {'id': 'MillerRichardKeith', 'name': {'family': 'Miller', 'given': 'R. K.'}}, {'id': 'SaudAF', 'name': {'family': 'Saud', 'given': 'A. F.'}}, {'id': 'CaugheyTK', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1987
A timedomain procedure for the identification of nonlinear vibrating structures, presented in a companion paper, is applied to a "calibration" problem which incorporates realistic test situations and nonlinear structural characteristics widely encountered in the applied mechanics field. The "data" set is analyzed to develop suitable, approximate nonlinear system representations. Subsequently, a "validation" test is conducted to demonstrate the range of validity of the method under discussion. It is shown that the procedure furnishes a convenient means for constructing reducedorder nonlinear nonparametric mathematical models of reasonably high fidelity in regard to reproducing the response of the test article under dynamic loads that differ from the identification test loads.
https://authors.library.caltech.edu/records/2kq2hfpb63

Identification of nonlinear vibrating structures: Part I  Formulation
https://resolver.caltech.edu/CaltechAUTHORS:MASjam87a
Authors: {'items': [{'id': 'MasriSF', 'name': {'family': 'Masri', 'given': 'S. F.'}}, {'id': 'MillerRichardKeith', 'name': {'family': 'Miller', 'given': 'R. K.'}}, {'id': 'SaudAF', 'name': {'family': 'Saud', 'given': 'A. F.'}}, {'id': 'CaugheyTK', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1987
A selfstarting multistage, timedomain procedure is presented for the identification of nonlinear, multidegreeoffreedom systems undergoing free oscillations or subjected to arbitrary direct force excitations and/or nonuniform support motions. Recursive leastsquares parameter estimation methods combined with nonparametric identification techniques are used to represent, with sufficient accuracy, the identified system in a form that allows the convenient prediction of its transient response under excitations that differ from the test signals. The utility of this procedure is demonstrated in a companion paper.
https://authors.library.caltech.edu/records/14shhx5t91

An Experimental Study of the Active Control of a Building Model
https://resolver.caltech.edu/CaltechAUTHORS:20120830153547717
Authors: {'items': [{'id': 'NishimuraI', 'name': {'family': 'Nishimura', 'given': 'Isao'}}, {'id': 'AbdelGhaffarAM', 'name': {'family': 'AbdelGhaffar', 'given': 'A. M.'}}, {'id': 'MasriSF', 'name': {'family': 'Masri', 'given': 'Sami F.'}}, {'id': 'MillerRichardKeith', 'name': {'family': 'Miller', 'given': 'R. K.'}}, {'id': 'BeckJL', 'name': {'family': 'Beck', 'given': 'J. L.'}}, {'id': 'CaugheyTK', 'name': {'family': 'Caughey', 'given': 'T. K.'}}, {'id': 'IwanWD', 'name': {'family': 'Iwan', 'given': 'W. D.'}}]}
Year: 1992
DOI: 10.1177/1045389X9200300108
This paper reports some of the results of an ongoing analytical and ex perimental study into the control of buildinglike structures subjected to nonstationary ran dom excitations such as earthquakes. The structural model used resembles a 5story build ing about 2.5 meters high. The building model was subjected to a variety of directforce excitations. The control algorithm used employs an adaptive structural member at a prede termined location in the model in order to attenuate the structural response relative to the moving building foundation. An electromagnetic actuator is used to generate the required control faces in the "smart" member. Among the key features of the algorithm under dis cussion are:
1. Only one active controller is required to attenuate the vibration response contributed by the first three modes; the damping factor is increased from virtually zero to about 20%.
2. Only two sensors are needed for this algorithm; this leads to simpler instrumentation and a more robust system.
3. Due to the optimization procedure used to select the controller location, a significant amount of damping augmentation is obtained from a relatively small amount of control energy.
4. The whole design procedure was demonstrated; special attention was paid to the time lag problem of the active controller and the stability of the system was discussed.
As part of the design phase of this study, a system identification procedure was used to develop a suitable reducedorder mathematical model. The results of a simulation study J. of IN TELL. MATER. SYST. AND STRUCT., Yol. 3 January 1992 1045389X/92/01 013432 $6.00/0 © 1992 Technomic Publishmg Co., Inc. using this identified model are compared to experimental measurements. Problems en countered in the experimental phase of the study are reported and discussed. It is shown that 1) the algorithm under discussion is capable of reliably controlling the motion of the test structure under arbitrary dynamic environments, and 2) the features of the algorithm make it a promising candidate for application to large civil structures.
https://authors.library.caltech.edu/records/70vy4gcd70