有限长线接触混合润滑特性研究

Analysis on the mixed lubrication performance of finite line contact

选择规则表面粗糙度分布,建立了有限长线接触混合润滑模型,数值模拟粗糙度幅值、波长、方位角和工况变化对润滑特性的影响。结果表明:建立的数学模型在较宽工况范围内具有良好的适应性;随着粗糙度波长增大,接触线中部首先发生润滑状态改变,说明增大粗糙度波长有益于改善润滑;随着粗糙度幅值增大,压力波动剧烈,边缘效应更加显著;工况变化对润滑状态影响明显,其中在润滑状态转换区域的润滑特征参数变化显著;随着粗糙度方位角的变化,润滑特征参数呈现周期性波动,当方位角为0°时润滑状态最佳,方位角为45°时润滑状态最差。

The mixed elastohydrodynamic lubrication（ mixed-EHL） of finite line contact was studied,considering the regular surface roughness. The effects of the wavelength,amplitude and orientation angle of surface roughness and the working conditions variation on lubrication characteristics were discussed. The results show that the numerical model is simple and robust. The lubrication state at the middle of contact line is the first to be changed when the wavelength goes up. The increase in roughness amplitude increases the pressure fluctuation and hence enhances the edge effect. The working conditions have obvious influence on the lubrication state. Within the region of lubrication state transition,the characteristic parameters change significantly. The effect of roughness orientation angle on mixed lubrication is significant.The orientation angle of 0 degree is advantageous to finite line mixed-EHL,and that of 45 degree is the worst.