摘要
电液位置伺服系统在起动、换向以及动态过程中,对液压源流量的需求很大,当液压源供油能力相对不足时,产生液压冲击。为解决这一问题,提出利用液压执行器的速度信号抑制冲击的方法。通过检测执行器速度计算出执行器高压腔体积变化所产生的体积流量,当该体积流量大于液压源所能提供的最大实际流量时,冲击过程中出现暂短的压力急降现象,通过调整电液伺服阀输入信号,使执行器实际流量始终小于液压源所能提供的流量,达到抑制冲击的目的。仿真和试验均显示,该方法易于实现,可明显抑制电液伺服系统中因流量不足引起的冲击。
An electro-hydraulic position servo system has a large demand of source oil flow rate in starting, reversing and dynamic processes. Hydraulic impact may appear when the supply of flow rate is not enough. To solve this problem, a novel method with velocity feedback was proposed. An actuator velocity was detected and the volume flow rate caused by volume change of the actuator＇s high pressure chamber was calculated. When the volume flow rate was larger than the actual flow rate supplied by a oil source, a shorter process of source pressure sudden drop would appear. With adjusting the servo valve＇s input, the actuator＇s actual flow rate could be controlled always less than the supplied flow rate and the hydraulic impact could be eliminated. Simulation results and test results showed that the proposed method is easy to realize, and the hydraulic impact caused by the insufficient source oil flow rate is restrained obviously.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第2期107-110,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(50575156)
山西省自然科学基金(2008012005-1)
关键词
液压伺服系统
液压冲击
流量计算
electro-hydraulic servo system
hydraulic impact
flow rate calculation
