University of Macau / Faculty of Science and Technology. / Department of Electromechanical Engineering

Photocopy of a carbon copy of the original / xi, 331 leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 1966

Photocopy of a carbon copy of the original / xi, 331 leaves : ill. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 1966

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Please read the abstract in the section, 00front, of this document Please note that the Compact disc with Vehsim2d (demonstration version) (Appendix B) is not included / Thesis (PhD (Mechanical Engineering))--University of Pretoria, 2008. / Mechanical and Aeronautical Engineering / unrestricted

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A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering. Johannesburg 2016 / This investigation considers the influence of a three spring and damper suspension system (SDS) on overall vehicle performance. Three SDS systems are used in high performance winged racing cars to manage the effects of the aerodynamic forces. The aim of the investigation was to quantify and compare the performance of a three SDS system to that of a conventional two SDS system. The investigation was carried out on the Bailey Cars LMP2 race car. Physical track testing was conducted on Zwartkops Raceway to measure the vehicle’s performance, with further testing conducted on the vehicle’s tyres. A software model of the vehicle and tyres was then created in ADAMS/Car, with models for the conventional two SDS system, as well as the three SDS system. The ADAMS/Car model was then validated against the test data. A Design of Experiments approach was used to investigate the influence of the parameters in both the suspension models. The optimal set of suspension parameters, that maximised vehicle performance on Zwartkops Raceway, was then identified. The performance of the optimal suspension systems was then compared to quantify the effect of the three SDS system. It was found that the optimised three SDS system travelled 4.38 m less than the optimal two SDS in a 60 second simulation on Zwartkops Raceway. However, the three SDS was effectively able to isolate the pitch and roll stiffness of the vehicle. The optimal three SDS had a greater pitch stiffness and less roll stiffness than the two SDS. This is significant for winged vehicles where aerodynamic forces are highly sensitive to vehicle pitch, such as the Bailey Cars LMP2 race car, allowing for a soft wheel rate without sacrificing the pitch stiffness of the vehicle. / MT2017

by Lai Chun Yu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 75-79). / Abstracts in English and Chinese. / LIST OF FIGURES --- p.vi / LIST OF TABLES --- p.ix / Chapter 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Background --- p.1 / Chapter 1.1.1 --- Vibration Control of Suspension Systems --- p.1 / Chapter 1.1.2 --- Semi-active Devices --- p.3 / Chapter 1.2 --- Literature Review --- p.5 / Chapter 1.2.1 --- MR Fluid and Damper --- p.5 / Chapter 1.2.2 --- Vibration Control --- p.6 / Chapter 1.2.3 --- Robust Control --- p.8 / Chapter 1.3 --- Research Objective --- p.9 / Chapter 1.4 --- Organization of the Thesis --- p.9 / Chapter 2 --- MR DAMPER BEHAVIOR AND MODELING --- p.11 / Chapter 2.1 --- MR Damper --- p.12 / Chapter 2.2 --- Mathematical Model --- p.13 / Chapter 2.3 --- Experimental Setup --- p.15 / Chapter 2.4 --- Damper Characteristics --- p.18 / Chapter 2.5 --- Comparison Between Model with Experimental Data --- p.25 / Chapter 2.5.1 --- Graphical Study --- p.26 / Chapter 2.5.2 --- Quantitative Study --- p.26 / Chapter 2.5.3 --- Other Input Tests --- p.27 / Chapter 3 --- SEMI-ACTIVE VIBRATION CONTROL --- p.33 / Chapter 3.1 --- Dynamic Modelling of Suspension Systems --- p.33 / Chapter 3.2 --- Single-degree-of-freedom (SDOF) Passive Suspension System --- p.34 / Chapter 3.2.1 --- Viscous Damper --- p.34 / Chapter 3.2.2 --- MR Damper --- p.37 / Chapter 3.3 --- Single-degree-of-freedom (SDOF) Semi-active Suspension System --- p.41 / Chapter 3.3.1 --- Ideal Skyhook Control --- p.41 / Chapter 3.3.2 --- Semi-active Skyhook Control --- p.44 / Chapter 3.4 --- Semi-active Robust Control Development --- p.46 / Chapter 3.5 --- Sliding Mode Control --- p.47 / Chapter 3.6 --- Semi-active Damper Control --- p.51 / Chapter 3.6.1 --- On-off Control --- p.52 / Chapter 3.6.2 --- Continuous-state Control --- p.53 / Chapter 3.6.3 --- Comparison Between On-off and Continuous-state Controller --- p.54 / Chapter 4 --- SIMULATION STUDIES --- p.57 / Chapter 4.1 --- Transmissibility --- p.57 / Chapter 4.2 --- Different Base Excitations --- p.59 / Chapter 4.2.1 --- Bump Input --- p.60 / Chapter 4.2.2 --- Random Input --- p.62 / Chapter 5 --- CONCLUSION --- p.67 / Chapter 5.1 --- Summary --- p.67 / Chapter 5.2 --- Future Work --- p.68 / APPENDIX --- p.69 / Chapter A.1 --- Semi-active Control with MR Damper ´ؤ Main Program Listing --- p.69 / Chapter A.2 --- Sub-program Listing (Dynamic System) --- p.70 / Chapter A.3 --- Sub-program Listing (Sliding Mode Controller) --- p.73 / Chapter A.4 --- Sub-program Listing (MR Damper Model) --- p.73 / BIBLIOGRAPHY --- p.75

Lam Hiu Fung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 106-111). / Abstracts in English and Chinese. / abstract --- p.i / 摘要 --- p.iii / acknowledgements --- p.v / table of contents --- p.vi / list of figures --- p.viii / list of tables --- p.xi / Chapter 1 --- introduction --- p.1 / Chapter 1.1 --- Controllable Suspension System --- p.1 / Chapter 1.1.1 --- Automotive Suspension System --- p.2 / Chapter 1.1.2 --- Controllable Devices --- p.4 / Chapter 1.1.3 --- MR Fluid and Damper --- p.5 / Chapter 1.2 --- Vibration Control --- p.5 / Chapter 1.2.1 --- Active Control --- p.5 / Chapter 1.2.2 --- Semi-active Control --- p.6 / Chapter 1.2.3 --- Robust Control --- p.7 / Chapter 1.3 --- Research Objective --- p.7 / Chapter 1.4 --- Thesis Outline --- p.8 / Chapter 2 --- PARAMETRIC STUDY OF SUSPENSION SYSTEMS --- p.9 / Chapter 2.1 --- System Models and Transmissibility --- p.9 / Chapter 2.1.1 --- Passive Suspension System --- p.10 / Chapter 2.1.2 --- Skyhook Suspension System --- p.15 / Chapter 2.1.3 --- Groundhook Suspension System --- p.24 / Chapter 2.1.4 --- Hybrid Suspension System --- p.32 / Chapter 2.1.5 --- Comparison among four suspension systems --- p.41 / Chapter 2.2 --- Characteristics analysis --- p.45 / Chapter 2.2.1 --- Passive Suspension System --- p.45 / Chapter 2.2.2 --- Skyhook Suspension System --- p.47 / Chapter 2.2.3 --- Groundhook Suspension System --- p.50 / Chapter 2.2.4 --- Hybrid Suspension System --- p.52 / Chapter 2.3 --- Stability --- p.54 / Chapter 2.3.1 --- Stability in the Sense of Lyapunov for Suspension Systems --- p.54 / Chapter 2.3.2 --- Stability for four Suspension Systems --- p.57 / Chapter 2.4 --- Optimization --- p.63 / Chapter 2.4.1 --- Single-Degree-of-Freedom Passive System --- p.63 / Chapter 2.4.2 --- Two-Degree-of-Freedom Passive System --- p.65 / Chapter 2.4.3 --- Hybrid Suspension System --- p.67 / Chapter 3 --- SUSPENSION SYSTEM WITH VIBRATION CONTROLLER --- p.71 / Chapter 3.1 --- Two-Degree-of-Freedom Quarter Car Model --- p.71 / Chapter 3.2 --- MR Damper --- p.73 / Chapter 3.3 --- Vibration Controller --- p.75 / Chapter 3.3.1 --- System Controller: Sliding Mode Control --- p.76 / Chapter 3.3.2 --- Damper Controller: Continuous-state Control --- p.83 / Chapter 4 --- SIMULATION RESULTS --- p.85 / Chapter 4.1 --- Transmissibility analysis --- p.86 / Chapter 4.2 --- Simulation --- p.89 / Chapter 4.2.1 --- Test by Bump Excitation --- p.89 / Chapter 4.2.2 --- Test by Random Excitation (White noise) --- p.91 / Chapter 4.2.3 --- Test by Road Elevation Profile --- p.95 / Chapter 5 --- CONCLUSIONS AND FUTURE WORK --- p.99 / Chapter 5.1 --- Summary --- p.99 / Chapter 5.2 --- Future Work and Further Development --- p.100 / Chapter 5.2.1 --- Parametric study of the MR suspension system --- p.100 / Chapter 5.2.2 --- Systematic method for selecting control gains --- p.101 / Chapter 5.2.3 --- New control algorithm --- p.101 / Chapter 5.2.4 --- Extension to half and full car models --- p.102 / Chapter 5.2.5 --- System implementation --- p.102 / appendix / Chapter A.1 --- Additional information of the transmissibility of unsprung mass.… --- p.103 / Chapter A.2 --- Additional figures of the random excitation test: --- p.104 / BIBLIOGRAPHY --- p.106

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