Multi-Objective Robust Non-Fragile H∞ Control for Active Suspension System with Parameter Uncertainty

An approach to devising multi-objective robust non-fragile H∞ controller for vehicle suspension systems with parameter uncertainties and controller disturbances is put forward in this paper. Based on the performance evaluation indicators of the suspension system, Ride comfort is reflected through H∞ performance, while using state-space ellipsoids to capture time-domain hard constraints. The circumstance for the presence of multi-objective robust non-fragile H∞controller is proposed, as derived from the Lyapunov stability theory, and the designed controller can be obtained by solving a linear matrix inequality (LMI). The simulation results of quarter vehicle suspension model show that although there is parameter uncertainty and controller gain variation, the proposed control strategy can achieve good ride comfort under given constraint conditions and meet the requirements of dynamic suspension deflection, dynamic tire load, and required control force.