一种新型双腔隔振器动力学特性仿真与试验研究

双腔液固混合介质(SALi M)隔振器是一种适用于低频重载隔振的新型隔振器,它由主腔室、附加腔室、连通管道以及油液和波纹管弹性单元体组成的液固混合介质构成。根据连通管道中流体运动的动量方程建立隔振器非线性动力学模型,将非线性流体阻尼线性化,得出系统的等效刚度和阻尼表达式。理论分析和仿真结果表明,系统的等效刚度和阻尼具有复杂变化特性。连通管道内部油液流动受到流体阻尼力、管道内部液柱惯性力的综合影响,系统等效刚度可能会出现渐软、渐硬、振荡等复杂特性。运用MTS试验机测试隔振器在简谐位移激励下的刚度和阻尼特性,并搭建隔振试验系统。试验结果较好地验证了理论分析和仿真计算所得结论,为下一步的工程设计奠定了基础。

Simulation and Experimental Research on Dynamics Characteristics of a Novel Dual-chamber Isolator

The dual-chamber Solid and Liquid Mixture (SALiM) isolator is a novel isolator which is designed for vibration isolation of heavy equipment with low frequency. It consists of main chamber, additional chamber, and oil pipe connecting the main chamber and the additional chamber. According to the momentum equation of the fluid in the connected pipe, the nonlinear dynamic model of the vibration isolator was established. The equivalent stiffness and damping expressions are derived by simplifying the nonlinear fluid damping into linear viscous damping when the isolator in excited by harmonic signal. The theoretical and simulation results show that the equivalent stiffness and damping of the system have complex properties. The internal flow of the connected pipe is affected by the fluid damping force and the inertia force of the liquid column. Consequently, the isolator may show stiffness hardening or softening effects under various situations. In this paper, the stiffness and damping characteristics of the isolator are tested by a MTS. A vibration isolation system was established to test the frequency response characteristics of the isolator.The experimental results verify the theoretical and simulation results, which lays the foundation for the following engineering application design.