水润滑橡胶轴承动态刚度和阻尼测试方法研究

Experimental Study on the Dynamic Stiffness and Damping of Water Lubricated Rubber Bearings

针对水润滑橡胶轴承动态刚度和阻尼测试过程中信号混杂等问题,采用了频谱分析法来测定其动力参数,从而有效避免来自外部环境中的信号干扰,使得试验结果更加准确、可靠。试验采用两次激振法对正置结构的水润滑橡胶轴承试验台进行两次不同频率激振,与以往的激振输入输出不同,该测试方法的输入量为位移激振,输出量为力,然后通过频谱分析法,计算出水润滑橡胶轴承的动力特性。最后,利用该方法研究了载荷和转速对水润滑橡胶轴承动力特性的影响。研究表明,该方法能有效避免旋转轴涡动产生的径向不平衡力所造成的激振力难以准确控制等问题,提高了测试精度和准确度,为水润滑橡胶轴承动态刚度和阻尼测试提供了新手段。

Spectral analysis for accurate measurement of dynamic stiffness and damping of water lubricated rubber bearing was used, which can filter out the interfering signals caused by bearing itself and external environment. The water lubricated rubber bearing was shocked twice by two shock excitation in different frequencies in the experiment. Different with previous excitation,the inputs were displacement,and based on that,the outputs vibration force can be measured. Thus,the dynamic characteristics can be calculated through spectral analysis. Finally,the influences of load and velocity on the dynamic characteristics of the water lubricated rubber bearing were studied,the results showed that this method can effectively avoid the issues of uncontrollability exciting force due to the unbalanced radial force resulted from whirling motion,which can supply a theoretical guidance for further experiment.