Author： SHARMA SATISH
Publisher： Taylor & Francis Ltd
ISSN： 0569-8197
Source： ASLE Transactions (American Society of Lubrication Engineers), Vol.47, Iss.4, 2004-01, pp. : 557-566
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Abstract
The present study describes the static and dynamic performance of an orifice-compensated hole-entry hybrid journal bearing system considering the combined influence of surface roughness and thermal effects. The Dowson generalized Reynolds equation governing the flow of variable viscosity lubricant in the clearance space of a smooth journal bearing is modified using the flow factors developed by Patir and Cheng. The effects of surface roughness parameterΛ, variance ratio$\bar{V}$rj, and the surface orientations vis-à-vis transverse, isotropic, and longitudinal roughness patterns on the performance characteristics of bearings are studied. The rough bearing and smooth journal combination ($\bar{V}$rj=0.0) with a transverse roughness pattern (=1/6) is observed to show the largest predicted load-carrying capacity of the bearing. The smooth bearing and rough journal combination ($\bar{V}$rj=1.0) with a transverse roughness pattern shows the highest stability threshold speed margin.
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