Abstract
Abstract
The effect of surface roughness on the stability characteristics of hydrodynamic journal bearings has been studied. Roughness has been considered to be a stochastic variable, which is stationary, ergodic with mean zero. Both one-dimensional roughness (longitudinal and transverse) and two-dimensional roughness (isotropic) have been studied using the stochastic finite element method. Journal bearings with different width-diameter ratios have also been considered. It is seen that the transverse roughness tends to increase the stability (non-dimensional mass parameter) whereas in the case of isotropic roughness there is a decrease when compared with the smooth bearing. Longitudinal roughness has a marginal effect of decreasing the stability of hydrodynamic journal bearings with rough surfaces.
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