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中文核心期刊

一类液固混合介质隔振器的动力学特性研究

Dynamic properties of a class of vibration with isolator with solid-and-liquid mixture

  • 摘要: 液固混合介质隔振器基于一种全新的工作机理,具有优良的隔振系统动力学特性.混合介质由一类几乎不可压缩液体和许多可压缩的固体单元混合而成.当振动、冲击发生时, 液体将动压力瞬间传递到所有单元体上,使它们同时参与变形,从而有效隔离振动,大幅度吸收、损耗冲击能量;若设计得当,这类隔振器可同时具有卓越的隔振和缓冲性能.以空心橡胶球作为固体单元体, 分析了该单元体在有限变形情况下的变形规律,分析了隔振器的非线性刚度特性; 采用MTS液压伺服试验系统进行了测试验证,理论分析和试验结果具有较好的一致性. 建立了系统的非线性动力学方程,采用多尺度摄动法获得了系统的频响特性, 发现系统具有软弹簧非线性动力学特性,并在试验中得到了证实; 因为弹性恢复力中存在位移平方项,通过试验和数值仿真进一步验证了系统响应的非对称性.

     

    Abstract: This paper describes a type of new vibration isolator withsolid-and-liquid mixture (SALiM) for vibration isolation and shock absorbing.The SALiM is composed of incompressible liquid and compressible elastic solidelements. Under shock or vibration loading, the incompressible liquid caninstantly pass the pressure onto all solid elements. The deformations of allsolid elements can greatly absorb and dissipate the energy of vibrations andshocks. In this paper, hollow rubber sphere was used as solid element in theisolator. Dynamic properties of hollow rubber sphere were investigated andthe nonlinear force-displacement relation of isolator was established. Inaddition, the motion equation of the isolator and its perturbation solutionare developed. The theoertical results show good agreement with the MTSexperimental data. Furthermore, the frequency response of the isolator isevaluated theoretically and measured on a test rig to show nonlinear dynamicbehaviors.

     

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