Adaptive fault-tolerance control based finite-time backstepping for hypersonic flight vehicle with full state constrains.

In this paper, a novel adaptive fuzzy fault-tolerant controller is developed for the Hypersonic Flight Vehicle (HFV) in the presence of unknown inertial and aerodynamic parameters. Based on the functional dissolution technique, the longitudinal model of hypersonic vehicle is transformed into velocity subsystem and altitude subsystem. With consideration of full state constraints, the controller is designed based on finite-time stability theory and the barrier Lyapunov functions (BLFs). To deal with the unknown faults, a new robust adaptive distributive law is proposed. In order to avoid the problem of “explosion of complexity” and obtain the finite-time convergence performance, the fuzzy fault-tolerant dynamic surface control (DSC) is designed. Finally, simulation results are provided to verify the effectiveness of the proposed control scheme. It is shown that all the signals in the closed-loop are bounded.