基于位置反馈的液压激振系统特性  

Characteristics of Hydraulic Excitation System Based on Position Feedback

作　　者：吴万荣[1] 孙鹏 WU Wanrong;SUN Peng(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《机械设计与研究》2020年第5期101-105,111,共6页Machine Design And Research

基　　金：国家自然科学基金资助项目(51774340)。

摘　　要：针对传统电液伺服激振系统成本高、抗污染能力差等问题,提出一种基于位置反馈的液压激振系统。该系统通过激振换向阀和活塞的位置反馈关系实现自动往复运动。根据激振系统工作原理,建立其数学模型和AMESim动态仿真模型,数值计算系统流量、压力及活塞反馈孔位置对激振系统特性的影响,并进行对比试验研究。研究结果表明:在一定范围内,随着系统压力、流量的增大,激振系统的激振频率、活塞运动末速度和激振能等性能指标均有明显的提升,而活塞换向行程无明显变化;激振系统的活塞运动行程与活塞换向反馈孔位置之间近似呈正比关系,而激振频率与反馈孔位置近似呈反比关系。Aiming at the problems of high cost and poor anti-pollution ability of traditional electro-hydraulic servo excitation system,a hydraulic excitation system based on position feedback is proposed.The system realizes automatic reciprocating motion by exciting the position feedback relationship between the reversing valve and the piston.According to the working principle of the excitation system,its mathematical model and AMESim dynamic simulation model are established to calculated the effects of system flow,pressure,and piston feedback hole position on the characteristics of the excitation system,and comparative experiments are conducted.The results show that,in a certain range,with the increase of the system pressure and flow rate,the performance indexes of the excitation system,such as the excitation frequency,the piston end velocity and the excitation energy,are obviously improved.But the piston reversing stroke has no obvious change.And there is approximately a proportional relationship between the piston reversing stroke and the piston returning feedback hole distance,while the excitation frequency is approximately inversely proportional to the position feedback hole.

关 键 词：液压激振 激振频率 换向行程 AMESIM仿真 

分 类 号：TH137[机械工程—机械制造及自动化]