H_∞ FAULT-TOLERANT CONTROLLER DESIGN FOR NETWORKED CONTROL SYSTEMS WITH TIME-VARYING ACTUATOR FAULTS

摘要

For the large scale and complicated structure of networked control system, time-varying actuator faults could inevitably occur when it works in a poor environment. H_∞ fault-tolerant controller for a new networked control system with time-varying actuator faults occurring is designed in this paper. Based on the network transmission environment, the networked control system is firstly modeled as a closed loop discrete-time system with time varying actuator faults and outside disturbance considered. And the time varying property of actuator faults is reflected by a time-varying parameter. Moreover, using Lyapunov stability theory and linear matrix inequality (LMI) approach, the H_∞ fault-tolerant controller is proposed to guarantee such faulty networked control system asymptotically stable. Finally, simulations are included to demonstrate the theoretical results.