Active Disturbance Rejection Attitude Control Of High Speed Aircraft Based On Stochastic Robust Method

The development of aerospace technology is of great strategic importance to all regions of the world,and the attitude control of aircraft is the key research direction of aerospace development,for high-speed,fast time-varying,nonlinear and strong coupling high-speed aircraft.Attitude control is an extremely important part.This paper designs a corresponding attitude control system for high-speed aircraft.Firstly,the nonlinear time-varying model of high-speed aircraft is established,and the uncertainty parameters of the model are analyzed.Then introduce the active disturbance rejection controller(ADRC)technology,and modify the aircraft model according to the auto disturbance rejection control technology,and design a classic second-order ADRC controller.The results show that too much uncertainty is ignored.The factors and the reason for the unmodeled modality cause a large amount of jitter in the control amount.Then,in order to solve the problems caused by the classic second-order ADRC controller,this paper proposes the cascade auto disturbance rejection control.Based on the idea of anti-step method,the aircraft system is divided into inner and outer rings,and the anti-interference control in the inner ring system.The aircraft controls the angular velocity of the aircraft,and the auto-disturbance control in the outer ring system controls the aerodynamic angle of the aircraft.The simulation shows that the cascade auto disturbance rejection controller has better control effect.After adding the uncertainty interference,the cascade auto disturbance rejection controller has better control effect,and this has excellent robustness.Finally,the theoretical proof of the robustness of the self-disturbance control is more complicated.In order to solve this problem,this paper proposes a method to optimize the parameters of the cascade auto-disturbance controller by using the stochastic robust method from the perspective of engineering application.The robust optimization method not only ensures the robustness of the cascade auto disturbance rejection controller,but also improves the control effect of the cascade auto disturbance rejection controller.