@phdthesis{10.7907/4TY3-Y818, author = {Carlson, John Arthur}, title = {Analytical and Experimental Studies of Vehicle Dynamics Behavior}, school = {California Institute of Technology}, year = {1955}, doi = {10.7907/4TY3-Y818}, url = {https://resolver.caltech.edu/CaltechETD:etd-12022003-114913}, abstract = {This thesis represents one step in the development of analysis in the field of vehicle dynamics made possible by modern computational techniques. A research program was set up, the main object of which was to conduct an appraisal of analysis by comparing the results of analysis with actual vehicle tests. Both experiment and theory are included in this one investigation. The following general conclusions were drawn from the results of the research program: 1. Relatively simple systems giving good quantitative results can be used to represent a vehicle in motion over a variety of courses. 2. The effects of varying vehicle properties (spring rates, damping characteristics, masses) can be studied by using these simple systems. The results obtained are of sufficient accuracy to be used for design purposes. An example of a design study demonstrating the application of analysis to a specific problem is presented. The problem was to investigate the possible use of the engine as a dynamic vibration absorber. The conclusion reached is that the engine mount stiffness may be chosen such that the shake of the frame caused by wheel bounce may be reduced. Conclusions reached on the effects of some automobile properties (suspension bump stops, suspension damping, and tire damping) are summarized.}, address = {1200 East California Boulevard, Pasadena, California 91125}, advisor = {Kyropoulos, Peter R.}, } @phdthesis{10.7907/76DZ-EH40, author = {Marks, Craig}, title = {The Effects of Chamber Geometry, Surface Characteristics, and Temperature Boundary Conditions on the Hydrogen-Oxygen Reaction}, school = {California Institute of Technology}, year = {1955}, doi = {10.7907/76DZ-EH40}, url = {https://resolver.caltech.edu/CaltechETD:etd-11122003-145332}, abstract = {The established mechanism of the hydrogen-oxygen reaction is reviewed and calculated results presented concerning the rates of reaction and the explosion temperatures expected with various concentrations of water vapor. A simplified theory is developed to predict the overall rate of reaction in the case where a strong temperature gradient exists. Experiments are described in which stoichiometric mixtures of hydrogen and oxygen are introduced to a closed, shallow, nickel plated, cylindrical combustion chamber and measurements made of the pressure change with time. The top surface of the chamber is heated while the bottom surface is either heated or cooled to provide isothermal or gradient conditions, respectively. A large catalytic reaction due to the nickel surfaces is observed. The measured reaction rates and the conditions for explosion with isothermal heating are consistent with predictions based on the established reaction scheme. With gradient heating the rates measured are larger than those predicted. by the simplified theory with temperatures of the top surface above 1300[degrees]R. This fact is believed to be caused by the diffusion of active intermediate reaction products from hot regions into the cooler reactants. These intermediate products are neglected in the simplified analysis. No explosion was observed with gradient heating even when the hot plate was above the temperature which caused isothermal explosion. This fact is explained on the basis of the strong inhibiting effect which water vapor exhibits toward the hydrogen-oxygen reaction.}, address = {1200 East California Boulevard, Pasadena, California 91125}, advisor = {Kyropoulos, Peter R.}, } @phdthesis{10.7907/3QCH-T047, author = {Schurman, Glenn August}, title = {An Investigation of the Autoignition of a Combustible Mixture Due to the Presence of a Heated Surface}, school = {California Institute of Technology}, year = {1950}, doi = {10.7907/3QCH-T047}, url = {https://resolver.caltech.edu/CaltechETD:etd-03272007-084015}, abstract = {An experimental investigation regarding the nature of the hydrogen-oxygen reaction in the vicinity of a heated surface is described. The experimental work was conducted at atmospheric pressure in a shallow rectangular combustion chamber. The upper surface of this chamber is heated to temperatures ranging from room temperature to 1615° R; the lower surface is maintained at a constant temperature of 550° R. The temperature distribution of the mixture between the two plates is the primary experimental measurement. This measurement was made with a Mach-Zehnder optical interferometer. The maximum temperature of the upper plate at which experiments were made was 1615° R. The maximum temperature at which interferograms were taken was limited by the presence of a nonuniform temperature distribution along the light path. It was found that the central area of the heated surface of the combustion chamber could be held at a temperature of 1710° R without an explosion occurring. The chemical reaction could not be detected below an upper plate temperature of 1500 ± 10° R. There is evidence that large composition gradients exist in the combustion chamber. These gradients persist for a much longer time than that predicted from the diffusion theory. Accordingly, the overall rate at which the reactants combine is much lower than that expected. The exact reasons for the suppression of the explosion and the reduced reaction rate are not understood. Two possible explanations are suggested.}, address = {1200 East California Boulevard, Pasadena, California 91125}, advisor = {Kyropoulos, Peter R.}, }