Delay-dependent fault-tolerant controller for time-delay systems with randomly occurring uncertainties

This paper addresses the passivity-based H control problem for a class of time-varying delay systems subject to nonlinear actuator faults and randomly occurring uncertainties via fault-tolerant controller. More precisely, the uncertainties are described in terms of stochastic variables, which satisfies Bernoulli distribution, and the existence of actuator faults are assumed not only linear but also nonlinear, which is a more general one. The main objective of this paper is to design a state feedback-reliable controller such that the resulting closed-loop time-delay system is stochastically stable under a prescribed mixed H and passivity performance level γ>0 in the presence of all admissible uncertainties and actuator faults. Based on Lyapunov stability method and some integral inequality techniques, a new set of sufficient conditions is obtained in terms of linear matrix inequality (LMI) constraints to ensure the asymptotic stability of the considered system. Moreover, the control design parameters can be computed by solving a set of LMI constraints. Finally, two examples including a quarter-car model are provided to show the efficiency and usefulness of the proposed control scheme. Copyright © 2017 John Wiley & Sons, Ltd.