터보차저의 축추력 예측을 위한 해석 및 실험적 연구
An analytical and experimental study for predicting the axial thrust forces in a turbocharger
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초록
In this paper, the main objective is to determine the mechanical responses due to the axial forces on thrust bearing for an automotive turbocharger. The rotating shaft in a turbocharger is supported by the bearings, usually oil-lubricated radial journal bearings and a thrust bearing. The axial forces acting on the thrust bearing have significant influences on the mechanical friction losses, which reduces the efficiency and performance of high-speed turbocharger. There are simple well-known formulas such as Petroff’s equation for calculating the mechanical frictional losses in these types of bearings. However, it's difficult to estimate the accurate axial forces from this formula. Thus, this work determined the relationship between thrust forces and strains by measuring and calculating the strains on thrust bearing and compared both results. The result shown that behaviors of axial strain are changed linear and non-linear depend on the boundary condition. Therefore, it’s possible to predict the magnitudes of the axial forces by measuring the strains under operating turbocharger.
Abstract
In this paper, the main objective is to determine the mechanical responses due to the axial forces on thrust bearing for an automotive turbocharger. The rotating shaft in a turbocharger is supported by the bearings, usually oil-lubricated radial journal bearings and a thrust bearing. The axial forces acting on the thrust bearing have significant influences on the mechanical friction losses, which reduces the efficiency and performance of high-speed turbocharger. There are simple well-known formulas such as Petroff’s equation for calculating the mechanical frictional losses in these types of bearings. However, it's difficult to estimate the accurate axial forces from this formula. Thus, this work determined the relationship between thrust forces and strains by measuring and calculating the strains on thrust bearing and compared both results. The result shown that behaviors of axial strain are changed linear and non-linear depend on the boundary condition. Therefore, it’s possible to predict the magnitudes of the axial forces by measuring the strains under operating turbocharger.
참고문헌 (6)
- D. F. Wilcock, "Bearing Design and Application" (1957), McGraw Hill
- 안기원, "유연 다물체 동력학모델을 이용한 크랭크트레인 동응력 해석", 한국기계기술학회지, 12(4), pp.67~74 (2010), 한국기계기술학회
- T. Lamquin, "Power Losses Identification On Turbocharger Hydro dynamic Bearing System : Test and Prediction", Proceedings of ASME Turbo Expo, 5, pp.153~162 (2009)
- G. Kostandin, "Axial Load Control on High-Speed Turbochargers : Test and Prediction", Proceedings of the ASME turbo expo, 1, pp.705~712 (2008)
- M. Deligant, "Experimental Identification of Turbocharger Mechanical Friction Losses", Energy, 39(1), pp.388~394 (2012)
- 제우성, "연료전지용 공기공급기의 케이스 변형량 해석 및 개선설계", 한국기계기술학회지, 13(4), pp.43~48 (2011), 한국기계기술학회