Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments

Title
Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments
Authors
이용복김태영김창호김태호
Keywords
공기 포일 베어링; 축방향 하중지지 능력; 최소윤활두께; 정특성; Thrust Air Foil Bearing; Bump Foil; Axial Load; Nonlinear Stiffness
Issue Date
2011-10
Publisher
TRIBOLOGY TRANSACTIONS
Citation
VOL 54, NO 6, 902-910
Abstract
Thrust air foil bearings are critical components in highefficiency turbomachinery, such as two-stage compressors subjected to large and irregular axial forces. In this article, a model of thrust bump foil bearings that predicts deflection with variable axial load is developed assuming no tilting effect of the thrust collar. To predict the air clearance, deflection of the elastic foundation was used in the air film height equation. Combined Dirichlet and Neumann-type boundary conditions were used for static load performance predictions. To verify the theoretical model, tests were performed with three different thrust air foil bearings with outer radii of 45, 50, and 55 mm. The rotating speed ranged from 10,000 to 25,000 rpm. From the test results, the model using nonlinear stiffness was in better agreement with the experimental results than the model using linear stiffness.
URI
http://pubs.kist.re.kr/handle/201004/40664
ISSN
1040-2004
Appears in Collections:
KIST Publication > Article
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