Influence of stochastic roughness on performance of a Rayleigh step bearing operating under Thermo-elastohydrodynamic lubrication considering shear flow factor

摘要

This paper studies the effect of stochastic roughness on performance of a Rayleigh step bearing operating under Thermo-Elastohydrodynamic lubrication (Thermo-EHL). The shear flow factor along with pressure correction factor has been introduced in the generalized Reynolds equation to model the Gaussian roughness distribution on the surface of the bearing. Progressive Mesh Densification (PMD) as an efficient method for forward iteration has been applied to solve the mathematical model. The results show that directional orientation of the surface roughness significantly influence the performance of a bearing. Less pressure gets generated under surfaces with longitudinal roughness orientation compared to other orientations. Compared to longitudinal roughness orientation, transverse orientation generates more load capacity and provide less friction coefficient under Thermo-EHL.