中文摘要：

电液位置伺服系统起动过程会造成系统压力突降和执行器运动速度大幅波动,产生液压冲击;当系统有多个执行器工作时,系统压力突降会导致其他执行器产生误动作,甚至发生安全事故。针对上述问题,提出两种解决方法。一是将位置控制过程分解为速度和位置两个控制过程,且执行器的最大速度由系统最大流量和液体的压缩性限制。二是利用阀口压差对伺服阀流量进行修正。理论上阐述了两种方法的原理,采用数字仿真和试验进行了验证,结果表明,在不影响系统响应特性的前提下,两种方法可以消除电液位置伺服系统起动过程中的系统压力突降和产生的冲击。

英文摘要：

The starting of electro-hydraulic position servo system might cause system pressure drop, actuator velocity fluctuation and hydraulic impact. When more than one actuator work in the system, the sudden pressure drop can cause other actuators to misact or even lead to safety accidents. Aiming at the said the problems, two solutions are proposed. One is to divide the position control procedure into a position control procedure and a velocity control procedure in which the maximum velocity of the actuator is restricted within the supply flow rate and the liquid compressibility. The other is to adjust the flow rate at the servovalve by means of pressure difference of the chambers. The principles of the two methods are described theoretically and verified by digital simulation and experiments of an electro-hydraulic position servo system. It is finally proven that the sudden drop of the supply pressure and hydraulic impact during the starting of electro-hydraulic position servo system can be removed with the two new methods without influence upon the system response properties.