The stability of oil journal bearing including bearing surface deformation and variation of oil viscosity (Q2730894)

The authors analyze the stability of oil journal bearings considering the effect of elastic distortion on the surface of bearing liner, and the variation of oil viscosity due to the pressure. The deformation of the liner is estimated iteratively by solving the equation for displacements in elastic medium together with Reynolds equation for pressure distribution. The iterations are performed until a compatible displacement-pressure and eccentricity ratio is obtained. A nonlinear analysis determines the locus of the journal for operating conditions. The critical mass parameter which is a measure of threshold of stability is obtained by determining the limit cycle of the journal orbit. It has been shown that the inclusion of variation of oil viscosity with pressure increases the value of stability parameter.