三通阀控单作用缸电液伺服系统的建模与仿真

Modeling and Simulation for Electro-hydraulic Servo System with Single-acting Oil-cylinder Controlled by Three-way Valve

为适应仅对液压缸单方向输出力的精度和稳定性要求精确控制的场合,设计了一种三通阀控单作用缸电液伺服系统。通过控制系统的输出压力达到控制系统的输出力的目的。对该系统进行了简化,建立了动态数学模型。利用MAT-LAB对该模型进行了仿真,获得了相应的阶跃响应曲线和伯德图。由动态性能和稳态误差可以证明所建立的数学模型与实际输出基本吻合。通过在仿真框图中改变系统主要参数,观察其对系统动态特性的改变,由此得出系统优化措施。

An electro-hydraulic servo system with single-acting oil-cylinder controlled by three-way valve was designed, in order to suit the situation that the accuracy and stabilization of oil-cylinder out-put force only in single direction were required to be controlled accurately. By the use of MATLAB, the model was simulated, and the curve of step response and Bode diagram were obtained. The established mathematic model coincided with the actual output was proved by the dynamic performances and steady-state error. The variations of the dynamic characteristics of the system influenced by changing the main parameter of the system in the simulation block diagram were observed, thereout the optimization measures for system are obtained.