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http://dx.doi.org/10.9725/kstle.2008.24.6.378

The Static Performance Analysis of Foil Journal Bearings Considering Coulomb friction  

Kim, Kyung-Woong (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Lee, Dong-Hyun (School of Mechanical, Aerospace & Systems Engineering, KAIST)
Kim, Young-Cheol (System Engineering Research Center, KIMM)
Publication Information
Tribology and Lubricants / v.24, no.6, 2008 , pp. 378-385 More about this Journal
Abstract
In foil bearings, the friction between bumps and their mating surfaces is the major factor which exerts great influence on the bearing performance. From this point of view, many efforts have been made to improve the understanding of the influence of the friction on the foil bearing performance by developing a number of analytical models. However, most of them did not consider the hysteretic behavior of the foil structure resulting from the friction. The present work developed the static structural model in which hysteretic behavior of the friction was considered. The foil structure was modeled using finite element method and the algorithm which determines the conditions of the contact nodes and the directions of the friction forces was used to take into account the friction. The developed model was integrated into the foil bearing prediction code to investigate the effects of the friction on the static performance of the bearing. The results of analysis show that multiple static equilibrium positions are presented for the one static load under the influence of the friction, inferring its great effects on the dynamic performance. However, the effect of friction on the minimum film thickness which determines load capacity of the bearing is negligible.
Keywords
foil bearings; friction; load capacity;
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  • Reference
1 Walowit, J. A. and Anno, J. N., Modern Development of Lubrication Mechanics, Applied Science Publishers, London, Chap. 7., 1975
2 Heshmat, H. and Ku, C.-P., 'Structural Damping of Self-Acting Compliant Foil Journal Bearings', ASME J. of Tribol., Vol. 116, pp. 76-82, 1994   DOI   ScienceOn
3 Le Lez, S., Arghir, M., and Frene, J., 'A New Bump-Type Foil Bearing Structure Analytical Model', ASME J. of Eng. Gas Turbines and Power, Vol. 129, pp. 1047-1057, 2007   DOI   ScienceOn
4 Peng, J. P. and Carpino, M., 'Coulomb Friction Damping Effects in Elastically Supported Gas Foil Bearings', STLE Tribol. Trans., Vol. 37, pp. 91-98, 1994   DOI   ScienceOn
5 Lee, D. H., Kim, Y. C., and Kim, K. W., 'The Static Performance Analysis of Foil Journal Bearings Considering Three-Dimensional Shape of the Foil Structure', ASME Paper No. TRIB-07-1189, 2007
6 Peng, Z.-C. and Khonsari, M. M., 'Hydrodynamic Analysis of Compliant Foil Bearings with Compressible Air Flow', ASME J. of Tribol., Vol. 126, pp. 542-546, 2004   DOI   ScienceOn
7 Heshmat, H., Walowit, J.A., and Pinkus, O., 'Analysis of Gas Lubricated Foil Journal Bearings', ASME J. of Lubr. Tech., Vol. 105, pp. 647-655, 1983   DOI
8 Kim, D. J., 'Parametric Studies on Static and Dynamic Performance of Air Foil Bearings with Different Top Foil Geometries and Bump Stiffness Distributions', ASME J. of Tribol., Vol. 129, pp. 354-364, 2007   DOI   ScienceOn
9 Carpino, M. and Talmage, G., 'A Fully Coupled Finite Element Formulation for Elastically Supported Foil Journal Bearings', STLE Tribol. Trans., Vol. 46, pp. 560-565, 2003   DOI   ScienceOn
10 Le Lez, S., Arghir, M., and Frene, J., 'Static and Dynamic Characterization of a Bump-Type Foil Bearing Structure', ASME J. of Tribol., Vol. 129, pp. 75-83, 2007   DOI   ScienceOn
11 Ku, C.-P. and Heshmat, H., 'Compliant Foil Bearing Structural Stiffness Analysis Part I : Theoretical Model-Including Strip and Variable Bump Foil Geometry', ASME J. of Tribol., Vol. 114, pp. 394-400, 1992   DOI
12 Ku, C.-P. and Heshmat, H., 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings:Theoretical Consideration', STLE Tribol. Trans., Vol. 37, pp. 525-533, 1994   DOI   ScienceOn
13 Ku, C.-P. and Heshmat, H., 'Compliant Foil Bearing Structural Stiffness Analysis Part II : Experimental Investigation,' ASME J. of Tribol., Vol. 115, pp. 364-369, 1993   DOI   ScienceOn
14 Swanson, E. E., 'Bump Foil Damping Using a Simplified Model,' ASME J. of Tribol., Vol. 128, pp. 542-550, 2006   DOI   ScienceOn
15 C.-P. and Heshmat, H., 'Structural Stiffness and Coulomb Damping in Compliant Foil Journal Bearings : Parametric Studies', STLE Tribol. Trans., Vol. 37, pp. 455-462, 1994   DOI   ScienceOn
16 Ruscitto, D., Mc Cormick, J., and Gray, S., 'Hydrodynamic Air Lubricated Compliant Surface Bearing For An Automotive Gas Turbine Engine I-Journal Bearing Performance', NASA CR-135368, 1978
17 Peng, J. -P. and Carpino, M., 'Calculation of Stiffness and Damping Coefficients for Elastically Supported Gas Foil Bearings,' ASME J. of Trib., Vol. 115, pp. 20-27, 1993   DOI
18 Kikuchi, N., Finite Element Methods in Mechanics, Cambridge University Press, Chap. 4, 1986