Adaptive Fault-tolerant H/spl sub/spl infin// Control via State Feedback for Linear Systems against Actuator Faults

This paper studies the problem of adaptive fault-tolerant H_infin controller design for linear time-invariant systems. New indirect adaptive fault-tolerant controller design methods via state feedback are presented for actuator fault compensations. Based on the on-line estimation of eventual faults, the adaptive fault-tolerant controller parameters are updated automatically to compensate the fault effect on system. A notion of adaptive H_infin performance index is proposed to describe the disturbance attenuation performances of closed-loop systems. The designs are developed in the framework of linear matrix inequality (LMI) approach, which can guaranteed the asymptotic stability and adaptive H_infin performances of closed-loop systems even in the case of actuator faults. The effectiveness of the proposed design is illustrated via a decoupled longitudinal model of an F-18 aircraft