For a hypersonic vehicle with redundant elevators, an adaptive backstepping fault-tolerant control scheme is designed for its longitudinal motion model. In the backstepping design, the dynamic surface control strategy is adopted to eliminate the explosion of complexity in calculating the derivatives of virtual control inputs by introducing two first-order filters. An appropriate controller structure is proposed and the matching conditions are derived for adaptive fault compensation for the vehicle with redundant elevators subject to uncertain actuator faults. The adaptation laws are designed to update parameter estimates to implement the adaptive controller. The closed-loop stability under the proposed adaptive actuator fault compensation scheme is analyzed. Both analytical and simulation results are given to verify the effectiveness of the design and demonstrate the desired performance for altitude and velocity control.

No abstract

In this paper, we consider T-S fuzzy systems with redundant actuators and design a novel adaptive fault-tolerant control scheme to compensate their actuator failures. The advantage of the proposed method is that it can deal with both the parameter uncertainties and failure uncertainties (i.e. the occurrence time, size and mode of the failure are unknown), and does not require a fault detection unit. A unified control structure is designed to accommodate different failure situations. When failures occur, the parameter adaptation law can tune the controller parameters automatically to compensate the effects of failure and achieve asymptotical state tracking. Simulation results have demonstrated the effectiveness of the proposed scheme.

No abstract