Aerodynamic Analysis of Pivotless Tilting Pad Gas Journal Bearing

Abstract

Gas lubrication has found a place of particular importance where it is necessary to keep the environment free from contamination by conventional lubricants. Pivot less tilting pad gas bearing mainly used for high speed rotors where whirling is the main issue. Each pad of the journal bearing forms a subsystem with its own local parameters to sustain the load. Basically three pads are used and each pad acts separately on the journal for better load carrying capacity. So during frequent start and stop application pads are coming in contacts protecting the bearing house. This paper contains aeronamic analysis of pivot less tilting pad gas journal bearing. Reynolds’equation is solved by finite difference method and Newton-Raphson method. Static characteristics like pressure profile, load carrying capacity, frictional force,coefficient of friction are calculated, and method to find dynamic parameters of stiffness and damping of a pivotless tilting pad gas journal bearing is shown. The author believes that such detail analysis on tilting pad gas journal bearing at different condition will help researchers around the world.