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Controller design and analysis of active suspension system in frequency domain

Several control methods have been developed to improve the vehicle’s dynamic performance and, specifically, its active suspension system. Most of the existing researches are carried out in the time domain. However, from the point of view of practical problems, the system’s stability and anti-disturbance can be described more intuitively in the frequency domain. Hence, this paper analyzes and designs a quarter-car active suspension system operating in the frequency domain. First, by choosing as input the road disturbance and the body acceleration as the output, we establish the corresponding transfer function of the quarter-car active suspension system. Then, we design a PI controller where the controller’s parameter ranges are obtained by the Routh criterion, which guarantees the closed-loop system’s stability. Finally, we demonstrate our method’s effectiveness through a comparative analysis of several simulation results.