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An Analysis of the Stability of Externally Pressurized Air-Lubricated Journal Bearings

외부가압 공기윤활 저어널베어링의 안정성에 관한 해석

  • 임종락 (금성사 가전연구소) ;
  • 김경웅 (한국과학기술원 생산공학과) ;
  • 김금모 (한국과학기술원 생산공학과)
  • Published : 1990.04.01

Abstract

The threshold of instability for a rigid rotor supported in externally pressurized airlubricated circular or non-circular journal bearings of finite length is theoretically analyzed. The analysis is performed for a bearing having one feeding plane, no recess volume, which is assumed to be a line source, and is based on a first order perturbation of journal center motion about steady state position. And then linearized system dynamic analysis is carried out. Numerical results are given, showing the threshold of instability as a function of supply pressure ratio, feeding parameter and load. It is shown that the region that 2-lobe bearing is more stable than circular bearing exists and whirl ratio of 2-lobe bearing is less than that of the other types of bearing.

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  1. 정압 베어링을 적용한 수소 액화 공정용 터보 팽창기 개발 vol.37, pp.3, 1990, https://doi.org/10.9725/kts.2021.37.3.91