管道液压冲击压力振荡特性分析

针对液压系统中液压冲击引起管道压力振荡的问题,以两端分别连接容腔和换向阀的等直径水平管道为研究对象,通过对管道物理模型的空间离散化,考虑频率相关摩擦,建立管道有限分段集中参数模型,考虑复杂流体现象,合理选择管道子模型,采用AMESim进行了仿真分析,得到管道压力振荡特性。并通过仿真分析确定了管道参数对压力振荡的影响规律。结果表明:AMESim法计算所得峰值压力与理论计算相比误差为1.5%,与Simulink法相比误差为6.8%,且在动态过程中AMESim法和Simulink法压力曲线吻合良好,证明了建模与仿真方法的正确性,为管道液压冲击压力振荡分析提供了一种新方法。

Analysis for Pressure Oscillations Characteristics of Hydraulic Impact in Pipeline

For the problem of pressure oscillations in pipeline caused by hydraulic impact in the hydraulic system , a horizontally-mounted with constant cross-sectional area pipe which connected to a tank and a directional valve is used as physical model of study .By discretizing the pipe as well as taking frequency-dependent friction into account , the sectional lumped parameter model and the princi-ple for the choice about the submodel of the pipe were established .AMESim was used to solve the model , characteristics of pressure os-cillations in pipeline were obtained in concerning complex fluid phenomenon .Meanwhile, the influence law of the pipeline parameters on pressure oscillations were determined through simulation analysis .The results show that as compared with the theoretical method , the AMESim calculation peak pressure error is 1.5%.Compared with the Simulink method , the AMESim error is 6.8%, as well as in the dynamic process , the pressure curves are in good agreement with Simulink method , which proves the validity of the modeling and simu-lation method.The method of AMESim gives a new approach for analysis the pressure oscillations and hydraulic impact in pipeline .