The mathematical model is also built and system nonlinear effects are analyzed , especially nonlinear effects of electro - hydraulic servovalve , pump station , and pipes 分析研究了系统非线性的影响，特别是电液伺服阀的非线性、油源、管道等因素的影响，建立了系统的数学模型。
Electrohydraulic servovalve is a kind of important competent in the electrohydraulic servo control system , its condition decides the performance of the whole system 电液伺服阀是结合了机械、电子和液压技术的高度精密部件，它的性能直接影响甚至决定整个电液伺服系统系统的性能。
Hydraulic flapper - nozzle servo - valve is the most important component in hydraulic control systems . it is used very widely in industrial and aerospace application fields because of its high responding speed 喷嘴挡板伺服阀作为伺服控制元件,是闭环电液伺服控制系统中最重要的核心元件。
The hydraulic servo system using electric - fluid servo valves to realize closed loop positioning control integrated with electromagnetic direct - change valve to realize the arms " compliance control was designed 设计了采用电液伺服阀实现闭环位置控制，结合电磁换向阀实现手臂的柔顺控制的液压系统。
Some techniques in developing software are discussed . in chapter five , the thesis first presents some actual test result . the measurement performance of the cat system is discussed 第五章给出了cat系统对电液伺服阀进行试验研究的结果，考核了测试系统的精度，介绍了软件中对测量误差的排除方法。
Proportional valves excellent static performance and appropriate dynamic performance , dynamic performance is low compared with servo valves , but had to meet general industrial control requirements 比例阀具有优良的静态性能和适当的动态性能，动态性能虽比伺服阀低，但已经可以满足一般工业控制的要求。
