파이어링 상태의 일정 축 각속도에서 엔진 베어링의 마모 해석 – Part I: 베어링 마모발생 부위 파악
Wear Analysis of Engine Bearings at Constant Shaft Angular Speed on a Firing State – Part I: Understanding of Bearing Wear Region
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
The purpose of Part I of this study is to find the potential region of wear scarring on engine journal bearings operating at a constant angular crank shaft velocity under firing conditions. To do this, we calculate the applied loads and eccentricities of a big-end journal bearing installed on a four-stroke and four-cylinder engine at every crank angle. Then, we find potential wear regions, such as a minimum oil film thickness, at every crank angle below most oil film thickness scarring wear (MOFTSW) obtained based on the concept of the centerline average surface roughness. Thus, the wear region is defined as a set of each film thickness below the MOFTSW at every crank angle. In this region, the wear volume changes according to the wear depth and wear angle, depending on the minimum oil film thickness at every crank angle. The total wear volume is the summation during one cycle. Graphical views of the region in the two-dimensional coordinates show the crank angle and bearing angle along the journal center path, indicating the position of the minimum oil film thickness. The results of wear analysis show that the possible wear region is located at a few tens of angles behind the upper cente of a big-end bearing at maximum power rpm.
Abstract
The purpose of Part I of this study is to find the potential region of wear scarring on engine journal bearings operating at a constant angular crank shaft velocity under firing conditions. To do this, we calculate the applied loads and eccentricities of a big-end journal bearing installed on a four-stroke and four-cylinder engine at every crank angle. Then, we find potential wear regions, such as a minimum oil film thickness, at every crank angle below most oil film thickness scarring wear (MOFTSW) obtained based on the concept of the centerline average surface roughness. Thus, the wear region is defined as a set of each film thickness below the MOFTSW at every crank angle. In this region, the wear volume changes according to the wear depth and wear angle, depending on the minimum oil film thickness at every crank angle. The total wear volume is the summation during one cycle. Graphical views of the region in the two-dimensional coordinates show the crank angle and bearing angle along the journal center path, indicating the position of the minimum oil film thickness. The results of wear analysis show that the possible wear region is located at a few tens of angles behind the upper cente of a big-end bearing at maximum power rpm.
참고문헌 (11)
- Chun, S. M., "Wear simulation for the journal bearings operating under aligned shaft and steady load during start-up and coast-down conditions", Tribology International, 97(1), pp.440~466 (2016)[DOI]
- Chun, S. M., "Parametric Study of Thermal and Unsteady Effects in Hydrodynamic Lubrication of Journal Bearings", pp.1989
- Booker, J. F., "Dynamically-loaded journal bearings: Mobility method of solution", Trans. of the ASME, J. Basic Engineering, 87, pp.537~546 (1965)[DOI]
- Booker, J. F., "Dynamically-Loaded Journal Bearings: Numerical Application of the Mobility Method", Trans. the ASME, J. Lubrication Technology, 93(1), pp.168~176 (1971)[DOI]
- Lu, X., "On the Lift-Off speed in journal bearings", Tribol. Lett., 20(3-4), pp.299~305 (2005)[DOI]
- Chun S. M., "Parametric study of inlet oil temperature and pressure for a Half-Circumferential grooved journal bearing", Tribol. Trans., 35(2), pp.213~224 (1992)[DOI]
- Chun S. M., "Aeration effects on the performance of a turbocharger journal bearing", Tribol. Int., 41, pp.296~306 (2008)[DOI]
- Ligterink, D. J., "Measurements of wear in radial journal bearings", Tribotest Journal, 3(1), pp.45~54 (1996)[DOI]
- 전상명, "모터링 시동 및 시동정지 사이클에서 경사진 축을 갖는 저어널베어링의 마모 해석 – Part I: 마모발생 가능영역에서의 유막 변화 연구", 한국트라이볼로지학회지, 33(4), pp.153~167 (2017), 한국트라이볼로지학회[DOI]
- 전상명, "모터링 시동 및 시동정지 사이클에서 경사진 축을 갖는 저어널베어링의 마모 해석 - Part II: 경사진 축을 지지하는 두 저어널베어링의 마모해석", 한국트라이볼로지학회지, 33(4), pp.168~186 (2017), 한국트라이볼로지학회[DOI]
- 전상명, "파이어링 상태의 일정 축 각속도에서 엔진베어링의 마모 해석− Part II: 저어널베어링 마모 계산", 한국트라이볼로지학회지, 34(4), pp.146~159 (2018), 한국트라이볼로지학회[DOI]