直驱式泵控电液伺服系统建模与动态特性分析

Modeling and dynamic characteristics analysis of direct drive pump-controlled electro-hydraulic servo system

为研究直驱式泵控电液伺服系统的动态特性,分析了系统的工作原理,分别建立了泵控和阀控两种控制系统的数学模型并进行了动态响应的理论分析和比较研究。搭建了一个包含交流伺服电机-定量泵为动力源的伺服驱动系统实验台,可以进行两种控制系统的性能实验。对实验系统进行了动态响应的数字模拟和实验研究,结果表明,由于泵控系统液压固有频率较低,动态响应慢,上升时间为阀控系统的8倍。在研究的基础上提出了提高该类系统动态特性的措施。

In order to study the dynamic characteristics of direct drive pump-controlled electro-hydraulic servo system,the working principle of the system was analyzed,and the mathematical models of pump-controlled system and valve-controlled system were built to carry out theoretical analysis and comparative research of dynamic response.A servo drive system laboratory bench was set up taking AC servo motor and fixed displacement pump as the power source,on which both control systems performance can be tested.The numeral simulation and the experimental study of dynamic response for the experiment system were done.The result shows that the rise time of the pump-controlled system is 8 times longer than that of the valve-controlled system because of its low hydraulic natural frequency and slow dynamic response.On the basis of the research,the measures to improve the dynamic characteristics of such systems were put forward.