Dynamical Pressure Distribution in Aerodynamic Bearing

Abstract

It is necessary to have a knowledge of the pressure distribution under dynamical conditions for the analysis of dynamical characteristics of a rotor bearing system.For this purpose, in this paper, the dydnamical pressure distribution in the aerodynamic journal bearing is analyzed using time-dependent Reynold's equation for small circular motion of journal center.To examine the reliability of the present solutions, the angle was calculated between the direction of miniumum thickness of the gas film and that of the maximum dynamical pressure under the condition of synchronous whirl.By comparison of the calculated values with the experimental ones, it was made clear that, when bearing number becomes large, it is necessary to consider the time-dependent effect on the dynamical pressure distribution.