Lubrication performance of finite journal bearings considering effects of couple stresses and surface roughness

To inspect the performance characteristics of finite journal-bearing systems, the combined effects of couple stress due to a Newtonian lubricant blended with additives and the presence of roughness on journal-bearing surfaces are studied in this article. Basing on the Stokes theory and Christensen’s...

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Bibliographic Details
Published in:Tribology international 2004-04, Vol.37 (4), p.297-307
Main Authors: Chiang, Hsiu-Lu, Hsu, Cheng-Hsing, Lin, Jaw-Ren
Format: Article
Language:English
Subjects:
Christensen’s stochastic model
Couple stress
Finite journal bearings
Longitudinal roughness
Transverse roughness
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Summary:To inspect the performance characteristics of finite journal-bearing systems, the combined effects of couple stress due to a Newtonian lubricant blended with additives and the presence of roughness on journal-bearing surfaces are studied in this article. Basing on the Stokes theory and Christensen’s stochastic model, the stochastic generalized Reynolds equation is deduced. The film pressure distribution equation is numerically solved by using the conjugate gradient method of iterations. According to the results, the couple stress effects can raise the film pressure of the lubricant fluid, improve the load-carrying capacity and reduce the friction parameter, especially at high eccentricity ratio. The surface roughness effect is dominant in long bearing approximation and the influence of transverse or longitudinal roughness to the journal bearing is in reverse trend. In general, the critical value of length-to-diameter is 1.1.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2003.10.005