Abstract:Aimed at the impact energy produced by UAV boost takeoff pulley, a hydraulic deceleration braking system of the boost pulley was proposed, which hydraulic cylinder was with the external absorption valve.The mathematical model of the hydraulic deceleration braking system was built; the simulation model of the system was built and solved by using Simulink software; the performance of the hydraulic deceleration braking system of the boost pulley was simulated and researched, the effects of piston diameter of hydraulic cylinder, diameter of energy absorption valve and spring compression of energy absorption valve on pressure of the rodless chamber and braking displacement of the boost pulley were analyzed. The research results show that the hydraulic deceleration braking system of the boost pulley can absorb the impact energy produced by the boost pulley;with the increase of the diameter of the energy absorption valve,the peak of the rodless chamber pressure of the hydraulic cylinder decreases and the braking displacement of the boost pulley increases; with the increase of the piston diameter of the hydraulic cylinder,the peak of the rodless chamber pressure of the hydraulic cylinder increases, and the braking displacement of the boost pulley increases; with the increase of the spring compression of the energy absorption valve, the braking displacement of the boost pulley decreases slightly,while the rodless chamber pressure of the hydraulic cylinder remains basically unchanged.