弹性变径管对于内流振动影响的仿真研究

Simulation Study on the Influence of Elastic Reducer to the Internal Flow Vibration

为减少在工况多变的液压管网系统中因内流振动导致的管道薄弱原件的寿命降低和形成噪声的问题,通过建立管道流动模型,并利用LMS Imagine.Lab AMESim仿真建模平台和基于Modelica语言的MWorks仿真平台对变径的内流振动进行建模分析。研究表明变径小端长度对振动分布影响不大;变径比、介质流速和介质波速对液态流水击振动影响较大。通过仿真可知,试验设计的变径十字花节流孔可以大大消耗振动能量,变径大端的大容腔会降低振动频率,从而降低噪声源的噪声。

In order to reduce the issue of reduced life and noise formation of weak components in the pipeline due to internal flow vibration in the hydraulic network system with variable working conditions,we had modeled the pipeline flow by building,and the internal flow vibration of the variable diameter was modeled and analyzed by using the LMS Imagine.Lab AMESim simulation modeling platform and the Modelica language based MWorks simulation platform.The study shows that the length of the small diameter end of the reducer has little effect on the vibration distribution;the variable diameter ratio,the medium flow rate and medium wave speed have a greater effect on the vibration of liq⁃uid flowing water.The simulation shows that the experimental design of variable diameter cruciform throttle orifice can greatly consume vibra⁃tion energy and the large capacitive cavity at the large end of the reducer will weaken the vibration frequency and reduce the noise source.