ROBUST FAULT-TOLERANT CONTROL FOR FUZZY DELAY SYSTEMS WITH UNMEASURABLE PREMISE VARIABLES VIA UNCERTAIN SYSTEM APPROACH

摘要

This paper addresses the problem of fault estimation (FE) and fault-tolerant control (FTC) for a class of fuzzy systems with unmeasurable premise variables, random time delays, actuator faults and external disturbances, simultaneously. Firstly, by using improved delay partitioning approach, a robust adaptive FE observer under H_∞ constraint is constructed. Then, based on the online estimation information, a novel fuzzy dynamic output feedback controller with unmeasurable premise variables is designed to compensate for the impact of actuator faults by using uncertain system approach, while guaranteeing that the closed-loop system is stable with the prescribed H_∞ performance. Compared with the existing results, the proposed design scheme is with less conservative and a wilder application range. Finally, the simulation results show the effectiveness of the proposed approach.