间隙对两轴液压振动试验系统动力学影响的研究

Joint clearance effects on dynamics of two-axis hydraulic vibration test system

为了分析间隙对两轴液压振动试验系统动力学响应的影响,建立了间隙副连续碰撞力学模型,将含间隙副的系统模型导入ADAMS中进行仿真分析,同时,搭建了一套实验系统并进行了简谐异步激振输入下的实验分析。仿真和实验结果表明:在激振器异步且运动副间隙尺寸一定的情况下,两个激振器之间产生了耦合振动效应,其稳态输出加速度响应有明显的波动,同时,随着激振频率和激振幅值的增加,系统峰值加速度响应急剧增加。因此,为了消除间隙副非线性因素的影响,合理设计两轴激振试验系统转动副间隙具有重要意义。

A continuous contact force model was built in order to investigate joint clearance effects on the dynamics of two-axis hydraulic vibration test system.The test system with clearance joint was imported into the software ADAMS for dynamic simulation,and an experimental set-up was designed and built to achieve some experimental validations under the simple harmonic excitation inputs with different phases.The results indicate that the coupling vibration effect between two exciters leads to the apparent fluctuation of steady response of accelerations in the case of certain clearance size and with excitations out of phase,meanwhile,the rapid increase of peak acceleration happens when the excitation frequency and excitation amplitude increase.Thus,the selection of appropriate clearance size in revolute joint for two-axis hydraulic vibration test system is a crucial step for eliminating the non-linear influence.