Lateral vibration characteristics of a rotor system supported by hydrodynamic journal bearings considering the effect of a bearing width

베어링 폭의 영향을 고려한 동수압 베어링에 지지된 회전축 시스템의 횡진동 특성

  • Han, Dong-Chul (Dept.of Mechanical Engineering, Seoul National University) ;
  • Choi, Sang-Hyun (Turbo and Power Machinary Research Center, Seoul National University) ;
  • Kim, Woo-Jeong ( Institude of Advanced Machinery and Design, Seoul National University) ;
  • Cho, Myung-Rae (Graduate School of Seoul National University)
  • 한동철 (서울대학교 기계설계학과) ;
  • 최상현 (서울대학교 터보동력기계연구센터) ;
  • 김우정 (서울대학교 정밀기계설계공동연구소) ;
  • 조명래 (서울대학교 대학원)
  • Published : 1997.12.01


This paper presents the characteristics of lateral vibrations of rotor system supported by hydrodynamic journal bearings. Finite element model is developed for the dynamic analysis of rotor system. Hydrodynamic bearings are modeled with the distributed springs and dampers in shape of the 2nd order polynomials in the direction of bearing width. Experiments are conducted to measure the natural frequency, and experimental results are compared with the theoretical results that are calculated using the point model and distributed model. Theoretical results using the distributed model agrees better with the measured results as bearing width increases. Also, this method is applied to actual three-stage turbo blower model. Then, critical speed and forced vibration analysis are performed.


Lateral Vibration;Hudrodynamic Journal Bearing;Finit Element Method(FEM);Distributed Model