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Abstract
Temperature rise in modern hydrodynamic bearings reaches such
high values affecting the bearing performance considerably. Beside the engineering surface can not be manufactured to be perfectly smooth.
Therefore, the results obtained from the solution of Reynolds equation
alone don’t give a true picture on the bearing behavior. In this work, the Reynolds equation is solved iteratively with the
energy and heat transfer equations using finite difference technique. To
consider the surface roughness some stochastic roughness patterns have
been assumed for the inner surface of the bearing bushing to assess
their effects on the bearing performance characteristics.
A comparison between the behavior of bearing with smooth and
rough surfaces has been conducted. Also an experimental investigation
has been carried out on a specially designed test rig. It is found that the
presence of surface roughness has a not ignorable influence on the
bearing characteristics. The most important conclusions are that, roughness effects are more pronounced at higher values of eccentricity ratio i. e in heavy duty regime. The effect of transverse roughness appears in a form of an increase in the load carrying capacity. whereas
longitudinal roughness causes a decrease in load carrying capacity as compared to the bearing with smooth surfaces for infinitely long bearings. The trend of hydrodynamic pressure distribution is found to be the same in both theoretical and experimental work.