| This paper discussed principally the robust fault-tolerant control problem of linear uncertain control systems. First, based on linear matrix inequality method and Lyapunov approach, the sufficient conditions of asymptotical stabilization are respectively given for the systems which possess definite matching conditions and value-bounded uncertainty with the failures of sensors or actuators. Furthermore, in the practical systems, the failures of the systems possess diversity in which structural disturbance occurs infrequently, and structural disturbance sometimes results in extraordinary abominable influence. So in the paper the design approach of controllers keeping systems asymptotical stabilization is principally discussed for a class interconnected systems with structural disturbance in which some or other subsystem is divorced from the whole large system or is connected renewedly. The simulation results are given for the method. The simulation results show the effectiveness of the proposed method.Secondly, fault-tolerant control can be regarded as the last line of defence keeping the systems running safely. However, in the fault-tolerant control it is not enough to merely ensure the stability of fault systems, and other satisfactory performance indexes are needed to be considered. For example the robustness, stability allowance, dynamic response performance and steady characteristics for the system should be considered on the basis of satisfying stability. So in the paper satisfactory fault-tolerant control of linear uncertain systems is discussed. First, satisfactory fault-tolerant control possessing a stability allowance is considered by using linear matrix inequality. And then the sufficient conditions of the existence of satisfactory fault-tolerant control with the failures of sensors or actuators are proposed, and the designed controllers are obtained. At last a simulation example is given, and it is illustrated that the proposed method is effective. |
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