Gust alleviation controller for elastic aircraft based on L1 adaptive control

摘要

Considering the elasticity of aircraft in gust, the L1 adaptive control can respond quickly while keeping up robust performance against elastic deformation. This paper presents a designed method of gust alleviation controller based on L1 adaptive output feedback. The pitching angle rate and the normal acceleration at the center of gravity are used as the feedback signals. The flap and the elevator are selected as the control surfaces of the gust alleviation system. Applying L1 adaptive output feedback controller can reduce the residual overload in gust. In the design process, the nonlinear part and the elastic part in the elastic modal plane model are considered as uncertainty in L1 adaptive control. The adaptive law can estimate the uncertain parameters and the low pass filter can keep the robustness. The simulation results show that the L1 adaptive control can reduce the influence of gust in the longitudinal of the aircraft.