插装式二维大流量电液伺服阀的动态特性研究

Research on Dynamic Characteristics of Plug-in Two-dimensional Large Flow Electro-hydraulic Servo Valve

为满足重载、冶金、锻压等应用场景中对伺服阀流量高输出能力及高功重比的要求,该文提出了一种插装式二维大流量电液伺服阀(7 MPa,400 L/min)并研究其动态特性。首先介绍插装式二维电液伺服阀的结构与工作原理。然后建立伺服阀的数学模型,对阻尼活塞进行分析,通过仿真研究阻尼活塞对系统稳定性和动态特性影响,以及系统开闭环时的动态性能。仿真结果表明,开环模式下伺服阀阶跃响应时间为81 ms,频宽为35 Hz,闭环时阶跃响时间为45 ms,频宽为45 Hz。最后对伺服阀进行了动态特性测试,实验结果表明,伺服阀开环时阶跃响应时间为85 ms,频宽为33 Hz,闭环时阶跃响应时间为45 ms,频宽为56 Hz。仿真结果与实验结果基本一致,证明插装式二维大流量电液伺服阀具有良好的动态特性。

In order to meet the requirements for high flow output capacity and high power-to-weight ratio of the servo valve in application scenarios such as heavy load,metallurgy,and forging,a cartridge two-dimensional high-flow electro-hydraulic servo valve(7 MPa,400 L/min)and focuses on its dynamic characteristics in this paper.The design concept and operating principle of the cartridge 2D high-flow EHSV valve is presented first.Then the mathematical model of the servo valve is derived,the damping piston is Analyzed,and research the influence of the damping piston on the stability and dynamic characteristics of the system through simulation,as well as the dynamic performance of the system during open and closed-loop.The simulation results of the open(closed)-loop model show that the rise time of the open-loop model is about 81 ms,and the frequency bandwidth is about 35 Hz,while the rise time is about 45 ms and the frequency bandwidth is about 45 Hz of the closed-loop model.Furthermore,build a test platform to test the dynamic characteristics of the cartridge 2D high-flow EHSV valve.As verified by experimental results,the rising time of the step response is about 85 ms and the bandwidth is approximately 33 Hz under the open-loop control,while that is 45 ms and 56 Hz for 25%input signal under the close loop control.It is concluded that the cartridge 2D high-flow EHSV has excellent dynamic characteristics.