Robust controller design for an electromagnetic active suspension subjected to mixed uncertainties

This article focuses on the modelling and robust control of a direct current (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.

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  • English

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  • Accession Number: 01498702
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 2013 9:43AM