Earticle

초록

영어

Load carrying capacity(LCC) can be reduced from its design value as a result of film thickness change when a journal is misaligned and some part of bearing is unintentionally translated. In this study, the numerical solution of the incompressible Reynolds equation was obtained by using the finite difference method and mass conservation algorithm (JFO boundary condition) with periodic pressure distribution in circumferential direction to analyze the change of LCC due to journal misalignment and step change of film thickness in axial direction for a journal bearing of vertical pumps. Smallest LCC in each eccentricity ratio is obtained as two angular positions are changed – an angular position where misalignment occurs, and another angular position where the axial step takes place while the degree of misalignment is fixed at 90%. Compared with the reaction force of plain journal bearing, the LCC reduced as much as 26.7% due to geometric effects of journal bearing at the eccentricity ratio of 0.9, while the step height is no higher than 0.1 times of bearing clearance.

목차

ABSTRACT
기호설명
그리스어
하첨자
1. 서론
2. 수치해석 모델
2.1 지배방정식 및 공동 알고리즘
2.2 저널 오정렬에 의한 저널베어링 수막두께 변화 모델
2.3 베어링 하부의 평행이동에 의한 저널베어링 수막두께 변화 모델
2.4 지배방정식의 차분 및 수치해석 방법
3. 수치해석 결과 및 토의
3.1 기존 연구와의 비교
3.2 저널 오정렬 시 베어링 하중지지력 변화
3.3 하부 베어링 수막두께의 축방향 단계적 변화 시 하중지지력 변화
3.4 저널 오정렬이 없는 평면 저널베어링과의 비교
4. 결론
References

키워드

하중지지력 저널베어링 오정렬 최소 막두께 축방향단계변화 공동유동 Load carrying capacity Journal bearing Misalignment Minimum film thickness Axial step change Cavitation flow

저자

• 최문호 [ Moon-Ho Choi | Member ] Corresponding Author

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