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The effect of rounding radius in bump foil structure on the static performance of foil journal bearings

The effect of rounding radius in bump foil structure on the static performance of foil journal... The purpose of this paper is to investigate the effect of the rounding in bump foil on the static performance of air foil journal bearings.Design/methodology/approachDuring the study, the bending moment of the new foil structure with rounding is proposed, and the bump foil stiffness is obtained from the elastic deformation energy theory. The validity of the presented foil model is verified through comparison with previous models. The static characteristics of foil bearings such as film thickness and attitude angle are obtained using a fully coupled elastic-gas algorithm and are compared to models with various rounding radius and friction coefficients.FindingsThere is an optimal rounding radius that makes the stiffness of bump foil maximum. As the static load increases, the minimum film thickness is proportional to the rounding radius but the attitude angle is inversely proportional. The effect of rounding with a large friction coefficient becomes negligible.Originality/valueThe rounding brings fundamental difference in the structural stiffness and static performance of foil bearings. The results are expected to be helpful to bearing designers, researchers and academicians concerned. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

The effect of rounding radius in bump foil structure on the static performance of foil journal bearings

Industrial Lubrication and Tribology , Volume 71 (5): 9 – Aug 22, 2019

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References (15)

Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
0036-8792
DOI
10.1108/ilt-02-2019-0058
Publisher site
See Article on Publisher Site

Abstract

The purpose of this paper is to investigate the effect of the rounding in bump foil on the static performance of air foil journal bearings.Design/methodology/approachDuring the study, the bending moment of the new foil structure with rounding is proposed, and the bump foil stiffness is obtained from the elastic deformation energy theory. The validity of the presented foil model is verified through comparison with previous models. The static characteristics of foil bearings such as film thickness and attitude angle are obtained using a fully coupled elastic-gas algorithm and are compared to models with various rounding radius and friction coefficients.FindingsThere is an optimal rounding radius that makes the stiffness of bump foil maximum. As the static load increases, the minimum film thickness is proportional to the rounding radius but the attitude angle is inversely proportional. The effect of rounding with a large friction coefficient becomes negligible.Originality/valueThe rounding brings fundamental difference in the structural stiffness and static performance of foil bearings. The results are expected to be helpful to bearing designers, researchers and academicians concerned.

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Aug 22, 2019

Keywords: Gas foil bearings; Bearing performance; Foil journal bearing; Rounding radius; Structural stiffness; Static performance

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