Abstract
In this second paper, the effect of finite width on the hybrid performance of externally pressurized foil bearings with a porous shaft is examined theoretically by considering the roughness effect of the foil surface. Based on Patir and Cheng's theory, the two-dimensional modified Reynolds equation and force-balance equation for the foil are solved iteratively by the finite-element technique, and the numerical solutions for pressure and gap height are obtained under the various combinations of bearing width-to-diameter ratio, dimensionless wrap angle of foil and dimensionless roughness height. From the numerical results, the combined effect of finite width and surface roughness on the pressure and gap height in externally pressurized foil bearings with a porous shaft is clarified.
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