Abstract:  Aiming at the problems caused by extra torque of aircraft rudder electro-hydraulic loading systems, a data-driven compound disturbance rejection control method including feedback controller and feedforward controller was proposed. Firstly,a linear active disturbance rejection controller (LADRC) was designed to estimate the uncertainty and multi-source interference of the system through the extended state observer (ESO), and suppress the interference through the interference compensator and feedback controller, thus ensuring better control performance of the closed-loop system. Then, the feedforward controller was used to regulate and improve the transient and steady-state performance of the system. In order to adjust the parameters of the compound disturbance rejection controller, the iterative feedback adjustment method based on data was adopted, and the considered control parameters was optimized through the input and output test data. Finally,the joint simulation test was carried out through MATLAB / Simulink and AMESim simulation platform. The results indicate that the adjustment time is reduced by 52%, the overshoot is reduced by 62%, and the steady-state error is reduced by 20% under the step response of the iterative feedback tuning(IFT) optimized compound disturbance rejection control method. Comparing with the traditional PID control scheme, the proposed method respectively reduces the system tracking error by 32% and 73% under the step response and sinusoidal command force signals.
Key words:  electro-hydraulic servo systems; datadriven; linear active disturbance rejection controller(LADRC); extended state observer(ESO); disturbance rejection control; iterative feedback tuning(IFT); robustness