Robust backstepping control for flight motion simulator based on nonlinear disturbance observer

As one kind of servo system with uncertainties and disturbances, to obtain high performance and good robustness of the flight motion simulator, a robust Backstepping controller was proposed based on a Nonlinear Disturbance Observer (NDO). Firstly, the design procedure of the robust Backstepping controller was described and correlative problems were proposed. Secondly, the principle and the design steps of Nonlinear Disturbance Observer were analyzed and expatiated respectively. Finally, simulation results on the flight motion simulator show that robust backstepping control based on Nonlinear Disturbance Observer can compensate for external disturbances and enhance the system control performance. Therefore both robustness and high performance of the flight simulator are achieved.