A hybrid control of active suspension system using H/sub /spl infin// and nonlinear adaptive controls

This paper presents a hybrid control of active suspension system for quarter-car model with two-degree-of-freedom by using H/sub /spl infin// and nonlinear adaptive control method. Suspension dynamics is linear and treated by H/sub /spl infin// method which guarantees the robustness of closed loop system under the presence of uncertainties and minimizes the effect of road disturbance to the system. The nonlinearity of the hydraulic actuator is treated by a nonlinear adaptive controller based on back-stepping control method. Simulation results are given both frequency and time domains to verify the effectiveness of the designed controllers.