Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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The Static Performance Analysis of Foil Journal Bearings Considering Coulomb friction

마찰을 고려한 포일 저널베어링의 정특성 해석

  • 김경웅 (한국과학기술원 기계항공시스템공학부) ;
  • 이동현 (한국과학기술원 기계항공시스템공학부) ;
  • 김영철 (한국기계연구원 시스템엔지니어링연구본부)
  • Published : 2008.12.31
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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.

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References

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