Adaptive dynamic surface saturated control of flexible hypersonic vehicle

This paper investigates the flight longitudinal tracking control problem of flexible hypersonic vehicle with the external disturbance, model parameter uncertainties and input saturation. First, velocity and altitude subsystems are established using decom-posing the longitudinal dynamics of flexible hypersonic vehicle, where the flexible effects, external disturbance and model parameter uncertainties are regarded as unknown bounded lumped disturbance. Second, the robust saturated controllers are designed for velocity and altitude subsystems by using the back-stepping method, adaptive tracking differen-tiator and tangent function with approximate saturation function, respectively. Finally, Lyapunov stability theory and simulations are adopted to verify the effectiveness of the control strategy.