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Research Papers: Applications

The Static Performance Analysis of Foil Journal Bearings Considering Three-Dimensional Shape of the Foil Structure

[+] Author and Article Information
Dong-Hyun Lee

School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Koreadhyun@kaist.ac.kr

Young-Cheol Kim

 Korea Institute of Machinery and Materials (KIMM), 17 Jang-Dong, Yuseong-Gu, Daejeon 305-343, Republic of Koreakyc@kimm.re.kr

Kyung-Woong Kim

School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong-Dong, Yuseong-Gu, Daejeon 305-701, Republic of Koreataeho@kaist.ac.kr

J. Tribol 130(3), 031102 (Jun 23, 2008) (10 pages) doi:10.1115/1.2913538 History: Received November 20, 2007; Revised March 24, 2008; Published June 23, 2008

To obtain the foil bearing characteristics, the fluid film pressure must be coupled with the elastic deformation of the foil structure. However, all of the structural models thus far have simplified the foil structure without consideration of its three-dimensional shape. In this study, a finite element foil structural model is proposed that takes into consideration the three-dimensional foil shape. Using the proposed model, the deflections of interconnected bumps are compared to those of separated bumps, and the minimum film thickness determined from the proposed structural models is compared to those of previous models. In addition, the effects of the top foil and bump foil thickness on the foil bearing static performance are evaluated. The results of the study show that the three-dimensional shape of the foil structure should be considered for accurate predictions of foil bearing performances and that too thin top foil or bump foil thickness may lead to a significant decrease in the load capacity. In addition, the foil stiffness variation does not increase the load capacity much under a simple foil structure.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Coordinate system of a foil journal bearing

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Figure 2

Local and global coordinate

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Figure 3

Transverse displacements of the top and bump foil at the contact nodes

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Figure 4

Foil structure and simplified model (Models 1 and 3): (a) foil structure; (b) configuration of Model 1; (c) configuration of Model 3

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Figure 5

Applied load along the bump longitudinal direction

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Figure 6

Deflections of separated and interconnected bumps: (a) deflections of separated bumps; (b) Deflections of inter-connected bumps

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Figure 7

Top center deflections of interconnected and separated bumps

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Figure 8

Pressure distribution, film thickness, and top foil deflection when the eccentricity ratio is 0.8 and the rotating velocity is 20,000rpm: (a) pressure distribution; (b) top foil deflection; (c) film thickness

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Figure 9

Comparison between the film thickness prediction and experimental data (24)

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Figure 10

Minimum film thickness and eccentricity ratio predictions determined from various structural models: (a) minimum film thickness versus applied load; (b) eccentricity ratio versus applied load

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Figure 11

Minimum film thickness versus top foil thickness for various static loads when the rotating velocity is 40,000rpm: (a) tb=0.05mm; (b) tb=0.07mm

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Figure 12

Top foil deflection, pressure distribution and film thicknesses for various top foil thicknesses (tb=0.05mm, ω=40,000rpm, wo=10N): (a) nondimensional top foil deflection; (b) nondimensional pressure distribution and film thickness

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Figure 13

Minimum film thickness versus the bump foil thickness for various static loads when the rotating velocity is 40,000rpm: (a) tt=0.1mm; (b) tt=0.15mm

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