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5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향
하진웅(Ha, Jin-Woong),명지호(Myung, Ji-Ho),석진익(Suk, Jhin-Ik),이안성(Lee, An-Sung),김영철(Kim, Young-Cheol) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.8
In tilting pad bearing design process, the selection of the proper configuration type of either a load-between-pad(LBP) or load-on-pad(LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a five pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5 MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by its asymmetric dynamic properties.
양단에 이종 베어링 지지를 갖는 소형 가스터빈의 위험 속도 고찰
하진웅(Jin Woong Ha),명지호(Ji Ho Myung),안성종(Seong Jong An),김영철(Young Cheol Kim) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
In this paper an investigation on critical speed is carried out with two rotor bearing systems defined according to a case of same bearing supports and a case of different bearing supports at both ends. For the critical speed analysis, there is applied the model of a 5 ㎿ industrial gas turbine generated by commercial rotordynmic software, DYNAMICS 4.4. Results have shown that the 2nd critical speed has dramatically increased in critical speed map by the stiffness imbalance between different bearing supports. It has also confirmed from the particular changes of mode shape and potential energy at the critical speed.
5패드 틸팅 패드 베어링의 설계 조건 변화가 소형 가스터빈의 횡진동 특성에 미치는 영향
하진웅(Jin Woong Ha),명지호(Ji Ho Myung),석진익(Jhin Ik Suk),이안성(An Sung Lee),김영철(Young Cheol Kim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
In tilting pad bearing design process, the selection of the proper configuration type of either a Load-Between-Pad (LBP) or Load-On-Pad (LOP) as well as preload and pivot offset conditions is to be carefully considered. Also the bearing needs to be designed in order to be suited for the rotor-bearing system and operating condition. In this paper, it is observed that the dynamic characteristics in a 5 pad tilting pad bearing for the LBP and the LOP configurations are influenced by the variation of preload and pivot offset. In this context, rotor dynamic analysis of the 5MW industrial gas turbine supported by the tilting pad bearing at the front and roller bearing at the rear is carried out based on the dynamic coefficients of the tilting pad bearing investigated. The result shows that two rigid body critical modes experience various changes according to the influence of the tilting pad bearing uniquely applied to one side of this machine. Mainly, the second critical speed, the rigid body mode of conical shape with high whirling in the tilting pad bearing, is significantly changed by preload and pivot offset regardless of the LBP and LOP configurations. And, the first critical mode, the rigid body mode of conical shape with high whirling in the roller bearing, is sensitively affected by preload applied to the LOP configuration and by the its asymmetric dynamic properties.