Purpose

In this study, the dynamic characteristics of the water-lubricated rubber bearing considering asperity contact are numerically studied, including water-film stiffness and damping coefficients and plastic-elastic contact stiffness coefficient.

Design/methodology/approach

The Kogut-Etsion elastic-plastic contact model is applied to calculate the contact stiffness coefficient at the bearing-bush interface and the perturbed method is used to calculate the stiffness and damping coefficients of water-film. In addition, the rubber deformation is determined by the finite element method (FEM) during the simulation. Parametric studies are conducted to assess the effects of the radial clearance, rubber thickness and elastic modulus on the dynamic characteristic of water-lubricated rubber bearing.

Findings

Numerical results indicate that stiffness and damping coefficients of water film and the contact stiffness of asperity are increased with the decreasing of the radial clearance and the dynamic coefficients are less sensitive to the rubber thickness compared with the elastic modulus of rubber. Furthermore, due to the existed groove, a sudden change of the water film direct stiffness and damping coefficients is observed when the eccentricity ratio ranges from 0.6 to 1.0.

Originality/value

It is expected this study can provide more information to establish a dynamic equation of water-lubricated rubber bearings exposed to mixed lubrication conditions.

中文翻译：

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粗糙接触下水润滑橡胶支座动力学特性的数值研究

目的

本研究对考虑粗糙接触的水润滑橡胶轴承的动力学特性进行了数值研究，包括水膜刚度和阻尼系数以及塑性-弹性接触刚度系数。

设计/方法/方法

采用Kogut-Etsion弹塑性接触模型计算轴承-衬套界面接触刚度系数，采用微扰法计算水膜刚度和阻尼系数。此外，橡胶变形由模拟过程中的有限元法 (FEM) 确定。进行了参数研究，以评估径向间隙、橡胶厚度和弹性模量对水润滑橡胶轴承动态特性的影响。

发现

数值结果表明，随着径向间隙的减小，水膜的刚度和阻尼系数以及粗糙面的接触刚度增加，动态系数对橡胶厚度的敏感性低于橡胶弹性模量。此外，由于存在凹槽，当偏心比在0.6至1.0范围内时，观察到水膜直接刚度和阻尼系数的突然变化。

原创性/价值

预计本研究可为建立混合润滑条件下水润滑橡胶轴承的动力学方程提供更多信息。