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5-2执行元件-负载环节的动态特性液压伺服系统中,放大器和传感器的动态,通常较伺服阀和执行元件-负载环节的高得多,可近似看作比例环节;伺服阀的传递函数可查阅样本或由其试验数据来确定;需要详细讨论的是执行元件-负载环节的传递函数。执行元件有油缸和油马达二种,它们可由伺服阀,也可由变量泵来控制,因此有阀控缸,阀控马达和泵控马达三种组合方式。阀控缸中常用的是四通(四边)滑阀-双作用缸,三通(双边)阀-差动缸二种。下面就来确定这些组合方式在不同负载条件下的传递函数,并讨论诸参数对系统性能的影响。
5-2 Actuator - dynamic characteristics of the load The hydraulic servo system, the dynamics of the amplifier and sensor, usually higher than the servo valve and actuator - the load link is much higher, can be approximated as a proportional link; servo valve transfer function can be Check the sample or test data to determine; need to be discussed in detail is the implementation of components - load transfer function. The actuator has two kinds of oil cylinder and oil motor. They can be controlled by servo valve or variable displacement pump. Therefore, there are three combinations of valve control cylinder, valve control motor and pump control motor. Valve control cylinder is commonly used Stone (four sides) spool - double-acting cylinder, three-way (bilateral) valve - differential two. Here to determine the transfer function of these combinations under different load conditions, and discuss the parameters of the system performance.