Studying  The  Effect   of   The  Surface   Roughness   on  the Maximum  Eccentricity  Ratio  and  The  Load  Carrying     Capacity   in  The  Journal   Bearing

Ali Muhsin, Ibrahem; Ameer,; A. Al, Ali

	Studying The Effect of The Surface Roughness on the Maximum Eccentricity Ratio and The Load Carrying Capacity in The Journal Bearing
KUFA JOURNAL OF ENGINEERING
Article 1, Volume 2, Issue 2, 2010, Pages 83-101
Authors
Ibrahem Ali Muhsin; ; Ali A. Al
Abstract
The focus of this investigation is to study the effect of the two dimensional isotropic surface roughness of both , journal and bearing on the maximum eccentricity ratio and the load carrying capacity of the finite length plain journal bearing , on the basis of full film lubrication regime to reduce the wear and heat produced by friction to extend the machine element life , in the steady state operation conditions. The appropriate equation to predict the suitable minimum film thickness which include the surface roughness is used . The Conventional Reynolds equation in two dimensional forms are solved numerically . The change of viscosity due to temperature and pressure , using adiabatic solution ,were taken into account. To investigate the effect of surface roughness on the maximum eccentricity ratio value and load capacity , it was assumed that there are two surfaces smooth and rough and are compared with each other . The results of this work show that the increase of the surface roughness case the maximum eccentricity ratio decreases at L / D ratios of 0.5 , 1 at range of roughness 0.3 – 1.2 Mm , which means that the limit of bearing to work with a steady state , full film lubrication . The load ratio at L / D = 0.5 is greater than at L / D = 1 for clearance ratio 0.001 , 0.002 . The surface roughness have no influence on the bearings that have 90 mm diameter or larger at clearance ratio 0.002 .
Keywords
plain journal bearing; surface roughness; load capacity; maximum eccentricity ratio

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