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针对飞机液压刹车系统,设计了一种2D电液压力伺服阀,以2D伺服螺旋机构为导阀,通过弹簧与主阀联动,采用直线位移传感器形成闭环位置反馈,精确控制出口压力;基于挤压油膜理论设计阀体结构,增大系统阻尼比,提高系统稳定性;在建立阀和油膜缓冲数学模型的基础上,仿真分析了主阀正开口量与弹簧变形量和主阀输出压力之间的关系,确保该阀具有良好的电流-压力特性;对初始系统、减小开环放大系数和增大系统阻尼比三种情况进行了稳定性仿真分析,验证了引入油膜阻尼缓冲设计的必要性。
Aiming at the hydraulic braking system of aircraft, a 2D electrohydraulic servo valve is designed. The 2D servo screw mechanism is used as the pilot valve. The spring is connected with the main valve, and the linear displacement sensor is used to form the closed loop position feedback to precisely control the outlet pressure. Oil film theory design of the valve body structure, increasing the damping ratio of the system to improve the stability of the system; based on the establishment of valve and oil film cushioning mathematical model based on the simulation analysis of the main valve positive opening and spring deformation and the main valve output pressure The simulation results show that the valve has good current-pressure characteristics. The stability simulation of the initial system is carried out to reduce the open-loop amplification factor and increase the damping ratio of the system. The necessity of introducing the damping design of the oil film is verified.