Abstract
The effects of surface roughness and variable permeability on the hydrodynamic characteristics of squeeze-film porous bearings have been studied by analyzing the ensemble-averaged incompressible Reynolds equation. Film thickness averages are derived for a roughness distribution given by a polynomial fit of a Gaussian distribution. The numerical results are obtained and compared with the anisotropic case having a different constant permeability in the respective directions. These findings are also compared with those for bearings having a precise description of roughness. It is shown that the load-carrying capacity decreases for higher values of the permeability parameter and that the optimum load shifts for off-squared plates. The squeeze-film time for the anisotropic case is found to be quite large compared to that for the isotropic case.
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