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http://dx.doi.org/10.5293/KFMA.2006.9.1.047

Performance Analysis of Air Foil Bearings with Bump Friction  

Kim, Young-Cheol (한국기계연구원 회전기계연구팀)
Kim, Dong-Hyun (한국과학기술원 기계공학과)
Kim, Kyun-Woong (한국과학기술원 기계공학과)
Publication Information
The KSFM Journal of Fluid Machinery / v.9, no.1, 2006 , pp. 47-55 More about this Journal
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.
Keywords
Bump-foil; Compliance; Damping; Reynolds Equation; Gas Foil; Journal Bearing; Elasto-Hydrodynamic Lubricatrion;
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Times Cited By KSCI : 1  (Citation Analysis)
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