Robust Fault-tolerant Control for Uncertain NCS Based on Dynamic Output Feedback

Abstract

This paper investigates the problem of robust integrality for networked control system with norm-bounded parameter uncertainties. Both network-induced delay and data packet dropout are taken into consideration, and data packet dropout is regard as a kind of special delay. A new type of Lyapunov-Krasovakii functional is proposed which contains some triple-integral terms. Based on dynamic output feedback control strategy, a delay-dependent robust integrality sufficient condition against actuator failures is derived in terms of integral inequality technique. Because the model tranformation is not used and the lower bound of delay is introduced, meanwhile, we don't ignore some useful items when estimating the upper bound of derivative of Lyapunov-Krasovskii function, the results possess less conservativeness. Moreover, the design approach of the controller are given via solving linear matrix inequalities. Finally, an example is used to illustrate the effectiveness and the feasibility of proposed approach.