| Summary: | 碩士 === 長庚大學 === 機械工程學系 === 103 === his study deals with the dynamic behavior of automobile structural system. First, the governing equations for the 9 degrees of freedom (DOF) lumped parameter automobile model are formulated by the Lagrange energy method. Then, the governing equations are derived and converted to state-space form. Using Matlab code, the dynamic characteristics of the system and the response of driver by road impulse function input are analyzed. There are two case to input road impulse function. Case one is input the road impulse function to 4 wheels at the same time, Case two is having time delay between front wheel and rear wheel. Meanwhile, do the same analysis by ANSYS software. Compare both results between Matlab code and ANSYS, it can be confirmed the formulation and analysis correctness of this paper.
Finally, we carry out the optimization analysis by Hooke &; Jeeves method to obtain optimal design variables for the spring and damping coefficient of suspension system to minimize the response of driver position under road impulse excitation. The results show that the quality performance of prototype is signification improved near 24 % and 14 % by using the average and random particles search.
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