In the chapter 2 , the power mechanism and main structure of the 50000kn hpsraf were designed first . then the schemes of hydraulic damping and parallelism control systems were given . and their theories and characteristics were explained 第二章首先确定了50000kn汽车大梁液压机中动力机构的主体结构和主要的参数，然后给出了冲裁缓冲和多缸同步两个系统的液压原理图，并对其工作原理及特点给予了解释说明。
The nonlinear problem is ubiquitous and is difficult to solve in electro - hydraulic servo system . it is caused by the throttling property , because of the existing of the servo valve , proportion valve and throttling valve , by the dead band , the back lash and so on 非线性是电液伺服系统中普遍存在且至今没有很好解决的问题,这些非线性主要由电液转换和控制元件(伺服阀、比例阀或节流阀)的节流特性和液压动力机构的滞环及死区等因素引起。
Therefore , it is proved that the control with high - speed on - off valves can realize the servo control function that be carried out with analog control whose control flowrate is proportional to is value . secondly , the paper builds up the mathematics model of the normal pneumatic servo system based on the symmetry structure , and the main characteristic parameters are analyzed and then introduce the theories to increase 论文基于易于进行分析的对称结构的高速开关阀阀控气缸,建立了气压伺服系统动力机构的数学模型,分析了其主要性能参数,提出了提高纯气动伺服系统阻尼比的方法,并从理论上分析了其实现的可能性。
