Finite-time H∞ adaptive attitude fault-tolerant control for reentry vehicle involving control delay

Abstract

This paper proposes a finite-time adaptive fault tolerant control method for the attitude control of reentry vehicle, by combining the radial basis function (RBF) network technology with adaptive fault tolerant control method. We simultaneously considered actuator faults, control delay, input saturation, time-varying parameter uncertainties and external disturbances when designing the control method. The theoretical part of this paper includes the establishment of attitude dynamic model concerning actuator faults and the design of finite-time H∞ adaptive attitude fault-tolerant controller. We proved the stability of our proposed adaptive attitude fault-tolerant controller through the Lyapunov function and the linear matrix inequality (LMI) method. The simulation results show that our proposed method not only can effectively deal with actuator faults in the attitude control system, but also has very good robustness for control delay, input saturation, time-varying parameter uncertainties and external disturbances.