波纹管式隔振单元体的刚度特性分析

Stiffness estimation of corrugated-pipe elements for vibration isolator design

液固混合介质隔振装置中的弹性单元体可有多种形式,波纹管单元体是其中性能较好的一种。设计液固混合介质隔振装置的首要工作便是计算弹性单元体的刚度。分别利用曲杆和板壳两种理论模型推导了波纹管单元体的轴向刚度,在此基础上,分析了单元体轴向刚度随几何构型的变化关系。对含该单元体的液固混合介质隔振装置进行了振动试验,得到了不同激励水平下的系统频响特性,并比较了理论与实测的频响特性,结果表明:曲杆模型、板壳模型与实测的隔振系统共振频率相对误差分别为7.5%,4.3%,板壳模型更贴近波纹管单元体的实际结构。

There are a few different types of elastic solid elements in Solid And Liquid Mixture（SALiM） vibration isolator,among which the corrugated-pipe element has the best performance.Generally,the stiffness of elastic solid elements should be estimated before SALiM isolator is designed.This paper estimates stiffness of the element by introducing two models,curved-bar model and plate-shell model,respectively.Then the relationship between stiffness and structure of the corrugated-pipe element is analyzed.The frequency response characteristic is evaluated theoretically and measured on a test rig under different input levels.Comparison between the theoretical resonance frequency and experiment result gives that the relative error of curved-bar model is 7.5%,and the relative error of plate-shell model is 4.3%.Therefore,the plate-shell model provide better precision.