Anti-saturation robust adaptive switching control scheme of a hypersonic flight vehicle

A robust adaptive switching control scheme with a multi-loop control structure was proposed for hypersonic flight vehicles in the presence of actuator constraints. State variables was designed with the multi-time-scale property of hypersonic vehicle motion, and the switched system was established to describe the state variables related to actuator constraints, thus cutting down the design effort for switched reference system and the corresponding controllers. The events that potentially induce actuator saturation were regarded as switching signals that specify the active subsystem and corresponding robust adaptive controller, which ensure control input restricted. Utilizing the multiple Lyapunov functions method and model reference adaptive control methodology, a detailed stability analysis for such control scheme was designed which guarantees the closed-loop switched system globally asymptotically stable with linear matrix inequation (LMI). Simulation demonstrates the effectiveness of the switching control scheme, and the system has well tracking performance and the amplitude of control input satisfies the actuator limit.