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ABSTRACT
In this paper, the MR damping force model of MR damper and 1/4 vehicle semi-active suspension dynamic model were established in terms of the nonlinear characteristic of MR semi-active suspension. Based on the differential geometry theory, the nonlinear model accurate linearization was realized, and the adaptive LQG control strategy was employed to overcome the uncertainty of dynamic system. the performance index weighting coefficients of LQG controller were determined by the improved analytic hierarchy process in terms of the actual requirement of the road. The simulation results show that the proper selection of the weighting coefficient with the improved AHP can be more easily; the body vibration can be reduced effectively by MR semi-active suspension adaptive LQG control, and the ride comfort and handling stability can be improved significantly than passive suspension, and the running safety also can be improved effectively.
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