| Summary: | 碩士 === 國立臺北科技大學 === 車輛工程系所 === 99 === Depending on the development of Vehicle Technology, there were many papers of car suspension systems published, and most of them studied on quarter-car suspensions, because it was simple and easy to analysis.
The aim of the car suspension system is to improve riding quality and increase handling stability. First, we use the Newton’s Second Law to model quarter- car suspension system, and get the state-space equations. Then use the state –space equations to design two controllers for quarter car suspension systems, and the control strategy is based on LQR and H_∞ control theorem. We can find LQR and H_∞ controllers and plot bode diagrams to analysis the frequency response. The controllers and suspension systems are simulated to proof the active suspension systems, which we design, have the better performance than passive suspension system in time domain. Finally, the robustness performance of the H_∞ controller is compared with the LQR controller.
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