Vibration control of an MR vehicle suspension system considering both hysteretic behaviorand parameter variation

Abstract

This paper presents vibration control responses of a controllable magnetorheological (MR)suspension system considering the two most important characteristics of the system; thefield-dependent hysteretic behavior of the MR damper and the parameter variation of thesuspension. In order to achieve this goal, a cylindrical MR damper which is applicable to amiddle-sized passenger car is designed and manufactured. After verifying the dampingforce controllability, the field-dependent hysteretic behavior of the MR damper isidentified using the Preisach hysteresis model. The full-vehicle suspension modelis then derived by considering vertical, pitch and roll motions. An controller is designed by treating the sprung mass of the vehicle as a parameter variationand integrating it with the hysteretic compensator which produces additional control input.In order to demonstrate the effectiveness and robustness of the proposed control system,the hardware-in-the-loop simulation (HILS) methodology is adopted by integrating thesuspension model with the proposed MR damper. Vibration control responses of the vehiclesuspension system such as vertical acceleration are evaluated under both bump and randomroad conditions.