Analysis of Load Carrying Capacity in Finite Porous Squeeze Film Bearings by Rapid Technique

Porous bearings have an advantage over conventional sleeve bearings, in which no external supply of lubricant is necessary for their satisfactory operation for long periods. These can operate as self-acting bearings; squeeze film bearings or externally pressurized bearings. Squeeze film is a phenomenon of two lubricated surfaces approaching each other with a normal velocity. The thin film of lubricant between the two surfaces acts as a cushion and prevents the surfaces making instantaneous contact. Generally, the pressure distribution in this fluid film is determined by using numerical methods. In the present analysis, a modified Reynolds equation has been developed by combining the Reynolds equation and the Laplace equation for the finite porous squeeze film bearing. The load carrying capacity is studied by solving this modified Reynolds equation using Rapid Technique. The results are shown graphically for selected parameter values. The results indicate, as the L/D ratio, and or eccentricity ratio increases, load carrying capacity increases but as the permeability parameter increases load carrying capacity decreases. For highly porous bearings, the squeezing effects are not significant. The obtained results are compared with the short bearing and solid bearing analysis.