Robust controller design for an electromagnetic active suspension subjected to mixed uncertainties
by Yongchao Zhang; Jianyong Cao; Guoguang Zhang; Fan Yu
International Journal of Vehicle Design (IJVD), Vol. 63, No. 4, 2013

Abstract: This article focuses on the modelling and robust control of a DC motor-based electromagnetic active suspension. Due to the small damping of the motor, the moments of inertia of the rotor and the nut can significantly affect the high-frequency performance of the suspension system and so, they are taken into consideration in the system modelling. In addition, parameter variations of the vehicle system and the unmodelled high-order dynamics of the actuator could influence the control effectiveness. Thus, the mixed uncertainties, composed of both multiple parameter uncertainties and the unmodelled high-order dynamics of the suspension and actuator are taken into account in the system model. To ensure the robustness and performance of the uncertain suspension system, a robust controller based on mixed μ-synthesis is designed. An easy method of choosing the weighting functions is proposed. The simulation results show the mixed μ-synthesis controller can meet the requirement of robust performance in the presence of mixed uncertainties and can achieve good ride comfort.

Online publication date: Thu, 16-Oct-2014

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