WIT Press


EVALUATION OF SQUEEZE EFFECT IN A GAS THRUST BEARING

Price

Free (open access)

Paper DOI

10.2495/MC170121

Volume

116

Pages

10

Page Range

121 - 130

Published

2017

Size

511 kb

Author(s)

FEDERICO COLOMBO, MONA MORADI, TERENZIANO RAPARELLI, ANDREA TRIVELLA, VLADIMIR VIKTOROV

Abstract

The squeeze effect of a gas thrust bearing is calculated using both a distributed parameters (DP) model and a lumped parameters (LP) model. A rectangular thrust bearing with no supply holes is considered in the analysis. In dynamic conditions, pressure values p1 and p2 are calculated. In steady-state conditions, these values coincide with ambient pressure pa. The developed LP model was validated with the DP model for a pad shape ratio (length/width) in the range of 0.5 to 2. Both models are validated in the literature in about a 1D parallel slider. The LP model has the advantage of faster implementation in comparison to the DP model. The LP model is also linearized by using a perturbation method to obtain the analytic expression of the dynamic stiffness. Therefore, it is possible to explain the effect of geometrical parameters on stiffness and damping coefficients.

Keywords

squeeze film air thrust bearing, lumped parameters model, dynamic stiffness