Robust H∞ Fault Tolerant Control Design for Linear Uncertain Systems with Time-varying Norm-bounded Parameter Uncertainty

A robust and reliable H_infin fault tolerant control design method is proposed, which is for linear uncertain systems with time-varying norm-bounded parameter uncertainty and also with actuator failures among a prespecified subset of actuators. Actuator failures are considered as disturbance signals of arbitrary values to the system. A state feedback control design is presented that stabilizes the plant and guarantees an H_infin-norm bound constraint on attenuation of augmented disturbances including failure signals for all admissible uncertainties as well as actuator failures. Sufficient conditions for the existence of controller are derived. Ranges of consistent indices are analyzed. And effective controller design methods are provided via LMI approach