摘要
针对电液位置伺服系统反馈传感器处存在较大间隙时,引起系统振荡加剧甚至不稳定的问题,根据位置反馈传感器同步测量缸的低阻尼特性,建立了反馈通道含有迟滞间隙特征的电液位置伺服系统的数学模型,针对一个电液位置伺服系统工程实例,利用Matlab软件对反馈通道含不同尺寸间隙的情况进行了仿真研究,结果表明:当间隙从小到大变化时,系统单位阶跃响应调节时间明显加长,超调量也逐渐增大,当间隙值增大至0.08mm时,出现极限环振荡,系统不能稳定工作。
Electro-hydraulic position servo system works instability and engenders limit cycle oscillation which caused by the sensor feedback with a big clearance.Depending on the position feedback sensors simultaneously measuring cylinder low damping characteristics,it is established that the model of electro-hydraulic position servo system whose feedback channel contains clearance mathematical model with hysteresis characteristics.For an electro hydraulic servo system engineering example,it is simulated by Matlab software through feedback channels with different size of the clearance.The results show that when the clearance is changed from small to large,the system unit step response settling time significantly gets longer and overshoot increases.The limit cycle oscillation occurs when the clearance value increases to 0.08 mm.The system is instable.
出处
《液压气动与密封》
2016年第6期1-4,共4页
Hydraulics Pneumatics & Seals
基金
国家自然科学基金项目(No.51365028)
关键词
反馈通道
安装间隙
阀控缸模型
极限环振荡
feedback channel
clearance
valve-controlled hydraulic
limit cycle oscillation
