| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 93 === This thesis applies and LQG optimal control laws in vehicle active suspension system to control the dynamic reaponse of a vehicle, and conpares their performances based on the suspension parameters of an actual vehicle, such as, damper, spring, body and tire …etc. Then, this study derives the mathematical model of in full-car suspension system and linearizes the model as a Linear Fractional Transformation (LFT) formulation, next adds the and LQG controllers to study their performances. The performance evaluation considers the displacement and acceleration of vehicle pitch-heave, left-right roll and up-down rise-fall, which are the key factors for a ride. By heuristic turning of the optimal weighting parameters achieves a sup-optimal optimization. The simulation result shows that both control and LQG control improve the heave-roll-pitch reponse effectively, moreover controller performs better than LQG controller.
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