Non-fragile output feedback H(infinity) vehicle suspension control using genetic algorithm
This paper presents an approach to design static output feedback and non-fragile static output feedback H(infinity) controllers for active vehicle suspensions by using linear matrix inequalities and genetic algorithms. A quarter-car model with active suspension system is considered in this paper. By suitably formulating the minimization problem of the sprung mass acceleration, suspension deflection and tyre deflection, a static output feedback H(infinity) controller and a non-fragile static output feedback H(infinity) controller are obtained. The controller gain is naturally constrained in the design process. The approach is validated by numerical simulation which shows that the designed static output feedback H(infinity) controller can achieve good active suspension performance in spite of its simplicity, and the non-fragile static output feedback H(infinity) controller has significantly improved the non-fragility characteristics over controller gain variations. (C) 2003 Elsevier Ltd. All rights reserved.
static output feedback active suspension non-fragile h(infinity) control