Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments
- Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments
- 이용복; 김태영; 김창호; 김태호
- 공기 포일 베어링; 축방향 하중지지 능력; 최소윤활두께; 정특성; Thrust Air Foil Bearing; Bump Foil; Axial Load; Nonlinear Stiffness
- Issue Date
- TRIBOLOGY TRANSACTIONS
- VOL 54, NO 6, 902-910
- 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.
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