Browse > Article
http://dx.doi.org/10.9725/kstle.2006.22.5.252

A Study on the Structural Stiffness and Coulomb Damping of Air Foil Bearing Considering the Interaction among Bumps  

Lee, Yong-Bok (Tribology Research Center, KIST)
Park, Dong-Jin (Tribology Research Center, KIST)
Kim, Chang-Ho (Tribology Research Center, KIST)
Publication Information
Tribology and Lubricants / v.22, no.5, 2006 , pp. 252-259 More about this Journal
Abstract
Air foil bearing supports the rotating journal using hydrodynamic force generated at thin air film. The bearing performances, stiffness, damping coefficient and load capacity, depend on the rotating speed and the performance of the elastic foundation, bump foil. The main focus of this study is to decide the dynamic performance of corrugated bump foil, structural stiffness and Coulomb damping caused by friction between bump foil and top foil/bump foil and housing. Structural stiffness is determined by the bump shape (bump height, pitch and bump thickness), dry-friction, and interacting force filed up to fixed end. So, the change of the characteristics was considered as the parameters change. The air foil bearing specification for analysis follows the general size; diameter 38.1 mm and length 38.1 mm (L/D=1.0). The results show that the stiffness at the fixed end is more than the stiffness at the free end, Coulomb damping is more at the fixed end due to the small displacement, and two dynamic characteristics are dependent on each other.
Keywords
air foil bearing; bump foil; structural stiffness; coulomb damping;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Roger Ku, C. -P., 'Dynamic Structural Properties of Compliant Foil Thrust Bearings-Comparison between Experimental and Theoretical Results,' Journal of Tribology, Vol. 116, pp. 70-75, 1990   DOI   ScienceOn
2 Roger Ku, C.-P. and Heshmat, H., 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearing: Theoretical Consideration,' Tribology Transaction, Vol. 37, No. 3, pp. 525-533, 1993
3 Roger Ku, C.-P. and Heshmat, H., 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearing: Parametric Studies,' Tribology Transaction, Vol. 37, No. 3, pp. 455-462, 1993
4 Peng, J.-P. and Carpino, M., 'Coulomb Friction Damping Effects in Elastically Supported Gas Foil Bearings,' Tribology Transaction, Vol. 37, No. 1, pp. 91-98, 1994   DOI   ScienceOn
5 Walowit, J. A. and Anno, J. N., 'Modem Development in Lubrication Mechanics,' Applied Science Publishers, London, 1975
6 Carpino, M., Medvetz, L. and Peng, J.-P., 'Effects of Membrane Stresses in the Prediction of Foil Bearing Performance,' Tribology Transaction, Vol. 37, No.1, pp.43-50
7 Heshmat, H., Walowit, J. A. and Pinkus, O., 'Analysis of Gas-Lubricated Foil Journal Bearings,' ASME Journal of Lubrication Technology, Vol. 105, No .4, pp. 647-655, 1983   DOI
8 Peng, J.-P. and Carpino, M., 'Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings,' Journal of Tribology, Vol. 115, pp. 20-27, 1993   DOI