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首页> 外文期刊>American Journal of Mathematical and Computer Modelling >Surface Roughness and Density Effects in Thermal Elastohydrodynamic Lubrication Point Contacts
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Surface Roughness and Density Effects in Thermal Elastohydrodynamic Lubrication Point Contacts

机译：热弹性流体动力学润滑点接触中的表面粗糙度和密度效应

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摘要

Elastohydrodynamic lubrication is a type of lubrication which most machine elements such as bearings operate. Density changes, thermal and surface roughness effects are also key factors in bearings, working under heavy loads and high speeds. Previous research has focused on smooth surfaces where density and thermal effects have been neglected. The present study intends to model the effect of surface roughness and density on thermal elastohydrodynamic lubrication for sliding-rolling bearing using non-Newtonian lubricant. The surface roughness is incorporated into the film thickness equation while the non-Newtonian nature of the lubricant is incorporated into the Reynolds and energy equation by using the Eyring model. The changes in compressibility of the lubricant is given by the lubricant's density equation. The energy equation is solved simultaneously with the Reynolds-Eyring equation, film thickness, density and viscosity of lubricant equations. The equations are then discretized using the finite difference numerical method and are solved simultaneously in Matlab together with their boundary conditions. It is noted that an increase in surface roughness results to a reduction in the film thickness and an increase in both temperature and pressure. Increase in temperature lowers the density of the lubricant while increase in pressure leads to an increase in density. It is also noted that an increase in the density of the lubricant leads to an increase in the film thickness. The temperature profile shows that as the load in the bearing is increased, the temperature of the lubricant also increases.
机译：弹性流动动力学润滑是一种润滑类型，大多数机器元件如轴承操作。密度变化，热和表面粗糙度效应也是轴承的关键因素，在重负载和高速下工作。以前的研究专注于密度和热效应被忽略的光滑表面上。本研究打算模拟表面粗糙度和密度对使用非牛顿润滑剂滑动滚动轴承热弹性流动润滑的影响。将表面粗糙度结合到膜厚度方程中，同时通过使用眼镜模型将润滑剂的非牛顿性质结合到雷诺和能量方程中。润滑剂密度方程给出了润滑剂的可压缩性的变化。能量方程与润滑剂方程的雷诺 - 眼镜方程，膜厚度，密度和粘度同时求解。然后使用有限差值数值方法离散等式，并在Matlab中同时求解它们的边界条件。应注意，表面粗糙度的增加导致膜厚度的降低和温度和压力的增加。温度的增加会降低润滑剂的密度，同时增加压力导致密度的增加。还注意到，润滑剂密度的增加导致膜厚度的增加。温度分布表明，随着轴承的负载增加，润滑剂的温度也增加。

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