Robust H∞ Fault-Tolerant Control for Linear Systems with Fast Adaptive Fault Estimation ?
نویسندگان
چکیده
The problem of adaptive fault-tolerant control for linear systems with time-varying actuator faults including outage and loss of effectiveness is investigated in this paper. After presenting a time-varying actuator fault model, a novel adaptive observer is designed so that the fault parameter can be estimated fast. Here, the inevitable fault estimation error, as well as the exogenous disturbance, is regarded as a part of the combined disturbance to be attenuated. Then, based on the Lyapunov stability theory and the estimated fault parameters, some sufficient conditions for designing the adaptive robust H∞ fault-tolerant controller are presented in the framework of linear matrix inequalities (LMIs), which can guarantee that the closed-loop system is asymptotically stable and robust for both time-varying fault and exogenous disturbance. Finally, the effectiveness and applicability of the proposed method is illustrated by a linearized longitudinal motion equation of the F-18 aircraft.
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