한국정밀공학회지 (Journal of the Korean Society for Precision Engineering)

  • 제18권8호
  • /
  • Pages.116-121
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  • 2001
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  • 1225-9071(pISSN)
  • /
  • 2287-8769(eISSN)
한국정밀공학회 (Korean Society for Precision Engineering)
권호 표지

능동 제어 유체 윤활 베어링으로 지지된 축-베어링 시스템의 동특성에 관한 연구

A Study on Dynamic Characteristics of a Rotor-Bearing System Supported by Actively Controlled Fluid Film Journal Bearing

  • 노병후 (한국과학기술원 기계공학과) ;
  • 김경웅 (한국과학기술원 기계공학과)
  • No, Byeong-Hu (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Gyeong-Ung (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • 발행 : 2001.08.01
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초록

The paper presents the dynamic characteristics of a rotor-bearing system supported by an actively controlled hydrodynamic journal bearing. The proportional. derivative and integral controls are adopted for the control algorithm to control the hydrodynamic journal bearing with an axial groove. Also, the cavitation algorithm implementing the Jakobsson-Floberg-Olsson boundary condition is adopted to predict cavitation regions in the fluid film more accurately than conventional analysis, which uses the Reynolds condition. The speed at onset of instability of a rotor-bearing system is increased by both proportional and derivative control of the bearing. The proportional control increases the stability threshold without affecting the whirl ratio. However, for the derivative control of the bearing, increase of stability threshold speed is accompanied by a parallel reduction of the whirl ratio. The integral control has no effect on stability characteristics of hydrodynamic journal bearing. The PD-control is more effective than proportional or derivative control. Results 7how the active control of bearing can be adopted for the stability improvement of a rotor-bearing system.

키워드

참고문헌

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