The externally pressurized, gas-lubricated journal bearing consisting of a porous bushing, through which gas enters the clearance space, is analyzed. The classical Reynolds' equation for laminar, isothermal, compressible flow in a finite journal bearing is modified to allow for the local mass flow through the porous bushing into the clearance space due to the difference between the constant supply pressure and the pressure within the bearing. At low mass flow rates, it is assumed that the flow in the porous bushing obeys the Darcy equation for isothermal, compressible “creeping flow.” The analysis is extended to include bearings with higher flow rates by a simple modification of the Darcy equation. The modified Reynolds' equation is solved for the case where the shaft does not rotate by perturbing the mass flow rate through the bearing using the eccentricity ratio as a small parameter. An asymptotic solution for the “short bearing” and the “maximum load-carrying capacity” is determined independent of the perturbation technique. The results of the perturbation technique are compared numerically with the results of the asymptotic solution, and they are found to be in agreement. Contributed by the ASLE Technical Committee on Bearings and Bearing Lubrication and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Chicago, Illinois, May, 1964. 1The work described herein is from a thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering, Rensselaer Polytechnic Institute; Troy, New York; June, 1963.
No takes yet. Share an insight, caveat, or question.
Sneck et al. (1964) studied this question.