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Numerical and Experimental Investigations on Preload Effects in Air Foil Journal Bearings

Mahner, Marcel and Li, Pu and Lehn, Andreas and Schweizer, Bernhard (2017):
Numerical and Experimental Investigations on Preload Effects in Air Foil Journal Bearings.
In: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, 7A, Charlotte, NC, USA, June 26-30, 2017, DOI: 10.1115/GT2017-63284,
[Conference or Workshop Item]

Abstract

A detailed elasto-gasdynamic model of a preloaded three-pad air foil journal bearing is presented. Bump and top foil deflections are herein calculated with a nonlinear beamshell theory according to Reissner. The 2D pressure distribution in each bearing pad is described by the Reynolds equation for compressible fluids. With this model, the influence of the assembly preload on the static bearing hysteresis as well as on the aerodynamic bearing performance is investigated. For the purpose of model validation, the predicted hysteresis curves are compared with measured curves. The numerically predicted and the measured hysteresis curves show a good agreement. The numerical predictions exhibit that the assembly preload increases the bearing stiffness (in particular for moderate shaft displacements) and the bearing damping.

Item Type: Conference or Workshop Item
Erschienen: 2017
Creators: Mahner, Marcel and Li, Pu and Lehn, Andreas and Schweizer, Bernhard
Title: Numerical and Experimental Investigations on Preload Effects in Air Foil Journal Bearings
Language: English
Abstract:

A detailed elasto-gasdynamic model of a preloaded three-pad air foil journal bearing is presented. Bump and top foil deflections are herein calculated with a nonlinear beamshell theory according to Reissner. The 2D pressure distribution in each bearing pad is described by the Reynolds equation for compressible fluids. With this model, the influence of the assembly preload on the static bearing hysteresis as well as on the aerodynamic bearing performance is investigated. For the purpose of model validation, the predicted hysteresis curves are compared with measured curves. The numerically predicted and the measured hysteresis curves show a good agreement. The numerical predictions exhibit that the assembly preload increases the bearing stiffness (in particular for moderate shaft displacements) and the bearing damping.

Series Name: ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
Volume: 7A
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Applied Dynamics (AD)
Event Location: Charlotte, NC, USA
Event Dates: June 26-30, 2017
Date Deposited: 08 Nov 2017 15:18
DOI: 10.1115/GT2017-63284
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