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자료유형
학술저널
저자정보
이인범 (계양정밀) 홍성기 (계양정밀)
저널정보
한국유체기계학회 한국유체기계학회 논문집 한국유체기계학회 논문집 제20권 제2호(통권 제101호)
발행연도
2017.4
수록면
53 - 62 (10page)

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이 논문의 연구 히스토리 (2)

초록· 키워드

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In this paper, the effect of oil conditions in rotor dynamic behaviors of a FFRB (Fully-Floating Ring Bearing) is investigated. Through the characteristic of a FFRB has two films, it has several advantages such as less friction loss and better stability over a wide speed range. However, it is difficult to supply a oil to the inner film. Thus, turbocharger makers have been paid significant attention to the lubrication of a FFRB because of its importance. This work focuses on the influence of oil inlet pressure and temperature. The methodologies of computational simulation and experimental test were used to estimate the rotor dynamic behaviors. In experimental test, the single-scroll turbocharger for the 1.4L diesel engine was used. The results show that the oil inlet pressure and temperature will place considerable influence on the rotor response. Oil conditions affect RSR (Ring Speed Ratio) which is cause of sub-synchronous vibrations, which also cause of oil whirling and whip even a critical speed. At higher speed range, the phenomenon of self-excited vibrations which is cause of instability of fluid whirl is investigated through the orbit shapes that consist of small orbit and large amplitude orbit. It is shown that some performance of a FFRB can be controlled by the conditions of oil supply. Finally, it was revealed that the oil induced operating conditions will strongly affect the turbocharger rotor dynamics behaviors.

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ABSTRACT
1. 서론
2. 터보차저 구성요소
3. 터보차저 시험조건
4. 수치해석 및 시험결과
5. 결론
References

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