The KSFM Journal of Fluid Machinery (한국유체기계학회 논문집)

Korean Society for Fluid machinery (한국유체기계학회)
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Performance Analysis of Air Foil Bearings with Bump Friction

범프마찰을 고려한 공기포일베어링의 성능해석

  • 김영철 (한국기계연구원 회전기계연구팀) ;
  • 이동현 (한국과학기술원 기계공학과) ;
  • 김경웅 (한국과학기술원 기계공학과)
  • Published : 2006.02.01
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Abstract

This paper presents the theoretical model to investigate the effect of Coulomb damping in the sub-structure of a foil bearing. Foil deflection is restricted by friction of bumps. Equivalent viscous damping of the bump foils is derived from the Coulomb friction. Dynamic equation of the bumps is constituted by stiffness and damping terms. This point give the difference from Heshmat's frictionless and simple compliance bump model. The fluid is modeled with the compressible Reynolds equation. A perturbation approach is used to determine the static and dynamic performance of the bearing from the coupled fluid-structural model. The analysis result shows that the static and dynamic performance is enhanced by bump friction. This analysis technique would be extended to development of a high performance bearing.

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References

  1. Walowit, J.A., Anno, 1975, 'Modern Development of Lubrication Mechanics,' Applied Science Publishers, Ltd., London
  2. Heshmat, H., Walowit, J.A., Pinkus, O, 1983, 'Analysis of Gas-Lubricated Foil Journal Bearings' ASME J. Lubracation Technology, pp. 647-655
  3. C.-P. Roger Ku and Heshmat, H., 1994, 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings : Theoretical Considerations,' Tribology Transactions, Vol. 37. pp. 525-533 https://doi.org/10.1080/10402009408983325
  4. C.-P. Roger Ku and Heshmat, H., 1994, 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings : Parametric Studies,' Tribology Transactions, Vol. 37, pp. 455-462 https://doi.org/10.1080/10402009408983317
  5. Perig, J.P. and Carpino, M., 1993, 'Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings,' ASME J. Tribology, Vol. 115, PP. 20-27 https://doi.org/10.1115/1.2920982
  6. Peng, J.P. and Carpino, M., 1994, 'Coulomb Friction Damping Effects in Elastically Supported Gas Foil Bearings,' Tribology Transactions, Vol. 37, pp. 91-98 https://doi.org/10.1080/10402009408983270
  7. Andres, L.S., 1995, 'Turbulent Flow Foil Bearings for Cryogenic Applications,' ASME J. Tribology, Vol. 117, pp. 185-195 https://doi.org/10.1115/1.2830598
  8. 김영철, 한정완, 김경웅, 2003, '가스포일 저널 베어링 및 스러스트베어링의 성능해석,' 한국윤활학회 37회 추계학술대회논문집, pp. 267-272
  9. 김영철, 한정완, 김경웅, 김수용, 2003, '공기 포일 베어링에 지지된 마이크로가스터빈의 회전체동역학적 설계,' 2003 유체기계연구개발발표회 논문집, pp. 662-667
  10. 김영철, 이동현, 김경웅, 2004, '범프포일 베어링의 탄성유체윤활 특성', 2004 유체기계연구개발발표회 논문집, pp. 98-103
  11. 김영철, 이동현, 김경웅, 2004, '범프 포일의 compliance가 포일저널 베어링의 성능에 미치는 영향', 제 3회 한국유체공학 학술대회 논문초록집, pp. 755-758
  12. 이동현, 김영철, 김경웅, 2004, '범프포일 강성 변화에 대한 포일저널 베어링의 정적, 동적 성능해석', 한국윤활학회지,20권 5호 pp. 245-251
  13. 이동현, 김영철, 김경웅, 2005, '범프포일의 3차원 형상을 고려한 공기 포일저널 베어링의 정특성해석', 한국윤활학회 40회 춘계학술대회논문집, pp. 85-90
  14. Lee, D.H., Kim, Y.C.. and Kim, K.W., 2005, 'The Static Performance Analysis of Air Foil J ournal Bearings Considering Three - Dimensional Structure of Bump Foil,' Proceedings of World Tribology Congress 2005, WTC2005- 63728, Washington, D.C., September, Washington,D.C., USA
  15. Lee, D.H., Kim, Y.C., and Kim, K.W., 2005, 'Influence of Coulomb Damping on the Air Foil Journal Bearing Performance,' The 1st Internaltional Conference on Manufacturing, Machine Design and Tribology, THB-105, June, Seoul