非对称液压缸的动态特性仿真研究  

Simulation study on dynamic characteristics of asymmetrical hydraulic cylinder

作　　者：郝前华[1] 何清华[1,2] 贺继林[1,2] 廖力达[1] 舒敏飞[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]湖南山河智能机械股份有限公司,湖南长沙410100

出　　处：《广西大学学报（自然科学版）》2010年第6期984-988,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家863项目资助课题(2003AA430200)

摘　　要：根据液流的连续性原理,通过对非对称液压缸进行受力分析,研究非对称液压缸的动态特性。在此基础上,提出非对称液压缸的数学模型,得到了液压缸阻尼比、固有频率间的关系。根据其数学模型,运用MATLAB软件对挖掘机铲斗液压缸动态特性进行仿真,得到了非对称液压缸的速度响应曲线和大腔的压力曲线,直观地揭示了其动态特性。通过对影响铲斗液压缸动态特性的主要因素的分析,提出了加快其速度响应和改善其运动平稳性的实用措施,指出降低铲斗液压缸的超调量与提高铲斗液压缸的响应速度存在矛盾,需要针对具体情况协调考虑。On the basis of continuity principle of fluids,dynamic characteristics of asymmetrical hydraulic cylinder are investigated by means of force equilibrium analysis.Based on the proposed mathematical model of the cylinder,relationship between damping ratio and natural frequency is obtained as well as the simulation results of dynamic characteristics of hydraulic cylinder of the bucket of an excavator in MATLAB.The velocity response curve and press curve of the large chamber reveal the dynamic characteristics visually.Measures to increase the velocity response and to improve the motion stability of the bucket cylinder are proposed based on the analysis of the main factors influencing dynamic characteristics.The contradiction between decreasing overshoot and increasing response speed of the cylinder needs to be resolved by considerations to specific circumstances.

关 键 词：动态特性 非对称液压缸 仿真 

分 类 号：TH137[机械工程—机械制造及自动化]