μ-Synthesis controller design for a DC-motor-based active suspension with parametric uncertainties

Abstract

This paper presents a µ-synthesis controller design method for a DC-motor-based active suspension. Considering multiple parametric uncertainties, a full-car suspension model with DC-motor actuator is built up and a µ-synthesis controller is proposed for the perturbed suspension system. Both frequency and time domain simulations are conducted, and results show that the µ-synthesis controller achieves better performance in ride comfort compared with H∞ controller. Analyses of robust stability and robust performance have been done, indicating that the µ-synthesis controller is able to maintain both of them, which is also validated by a case in this paper. Consequently, it can be concluded that the designed µ-synthesis controller can deal with parametric uncertainties for a DC-motor-based active suspension.