Abstract:- The surface roughness effects on the dynamic squeezing behavior of a finite length partial journal bearing under a time dependent oscillating load is studied. Use Christensen’s stochastic models to develop the stochastic Reynolds ’ equation of the longitudinal, transverse and uniform isotropic roughness. According to the results obtained, the roughness pattern, the height of roughness and have significant effects upon the mean oscillating squeeze-film characteristics of partial bearing. The value of the maximum eccentricity ratio is seen to decrease obviously with increasing value of roughness parameter for longitudinal roughness and to decrease slightly for transverse roughness, but to increase for uniform isotropic roughness, and to decrease with increasing Sommerfeld number. Transverse roughness bearing with higher surface roughness hampers the maximum eccentricity ratio, but longitudinal roughness and uniform isotropic roughness bearing reverse the effect
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