Simulation research on electro-hydrostatic landing-gear retracting and releasing system and braking system of UAV

The landing-gear retracting and releasing，and braking system of unmanned aerial vehicle（UAV）plays a crucial role in the process of takeoff，landing，and braking of UAVs. With the increasingly stringent flight conditions and requirements of UAV，traditional hydraulic systems can no longer meet the needs. According to the working principle of the electro-hydrostatic actuator，an electro-hydrostatic system integrating the landing-gear retracting and releasing，and braking functions of UAV is designed. The improved PID（proportion integration differentiation）control method is applied to the landing-gear retracting and releasing function，and two fuzzy PID control methods are designed to apply to the anti-skid braking function. On this basis，a co-simulation based on AMESim and MATLAB/Simulink is conducted to verify the system performance，and the simulation results are compared and analyzed. The results show that the fuzzy PID control method has good control effect and can effectively im prove the stability of the landing