파이어링 상태의 일정 축 각속도에서 엔진베어링의 마모 해석− Part II: 저어널베어링 마모 계산
Wear Analysis of Engine Bearings at Constant Shaft Angular Speed during Firing State – Part II: Calculation of the Wear on Journal Bearings
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This paper presents a wear analysis procedure for calculating the wear of journal bearings of a fourstrokes and four-cylinder engine operating at a constant angular crank shaft speed during firing conditions. To decide whether the lubrication state of a journal bearing is in the possible region of wear scar, we utilize the concept of the centerline average surface roughness to define the most oil film thickness scarring wear (MOFTSW) on two rough surfaces. The wear volume is calculated from the wear depth and wear angle, determined by the magnitude of each film thickness on a set of oil films with thicknesses lower than the MOFTSW at every crank angle. To calculate the wear volume at one contact, the wear range ratio during one cycle is used. The total wear volume is then determined by accumulating the wear volume at every contact. The fractional film defect coefficient, asperity load sharing factor, and modified specific wear rate for the application of the mixed-elasto-hydrodynamic lubrication regime are used. The results of this study show that wear occurs only at the connecting-rod big-end bearing. Thus, simulation results of only the big-end bearing are illustrated and analyzed. It is shown that the wear volume of each wear scar group occurs consecutively as the crank angle changes, resulting in the total accumulated wear volume.
Abstract
This paper presents a wear analysis procedure for calculating the wear of journal bearings of a fourstrokes and four-cylinder engine operating at a constant angular crank shaft speed during firing conditions. To decide whether the lubrication state of a journal bearing is in the possible region of wear scar, we utilize the concept of the centerline average surface roughness to define the most oil film thickness scarring wear (MOFTSW) on two rough surfaces. The wear volume is calculated from the wear depth and wear angle, determined by the magnitude of each film thickness on a set of oil films with thicknesses lower than the MOFTSW at every crank angle. To calculate the wear volume at one contact, the wear range ratio during one cycle is used. The total wear volume is then determined by accumulating the wear volume at every contact. The fractional film defect coefficient, asperity load sharing factor, and modified specific wear rate for the application of the mixed-elasto-hydrodynamic lubrication regime are used. The results of this study show that wear occurs only at the connecting-rod big-end bearing. Thus, simulation results of only the big-end bearing are illustrated and analyzed. It is shown that the wear volume of each wear scar group occurs consecutively as the crank angle changes, resulting in the total accumulated wear volume.
참고문헌 (18)
- 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, pp.440~466 (2016)[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 엔진 베어링의 마모 해석 – Part I: 베어링 마모발생 부위 파악", 한국트라이볼로지학회지, 34(3), pp.93~106 (2018), 한국트라이볼로지학회[DOI]
- Booker, J. F., "Dynamically-loaded journal bearings: mobility method of solution", Trans. of the ASME, J. of Basic Engineering, 87, pp.537~546 (1965)[DOI]
- Booker, J. F., "Dynamically-loaded journal bearings: numerical application of the mobility method", Trans. of the ASME, J. of Lubrication Technology, 93(1), pp.168~176 (1971)[DOI]
- Zhao, Y., "An asperity microcontact model incoporating the transition from elastic deformation to fully plastic flow", Trans. ASME, J. Tribol., 122, pp.86~93 (2000)[DOI]
- Masjedi, M., "Film thickness and asperity load formulas for line-contact elastohydrodynamic lubrication with provision for surface roughness", Trans. ASME, J. Tribol., 134(1), pp.011503~ (2012)
- McCool, J. I., "Relating profile instrument measurements to the functional performance of rough surfaces", Trans. ASME, J. Tribol., 109(2), pp.264~270 (1987)
- Kingsbury, E. P., "Some Aspect of the thermal desorption of a boundary lubricant", J. Appl. Phys, 29, pp.888~891 (1958)[DOI]
- Rowe, C. N., "Some aspects of heat of adsorption in function of a boundary lubricant", ASLE Trans., 9, pp.101~111 (1966)[DOI]
- Holm, R., "Electrical contacts" (1946), Almqvist & Wiksell
- Archard, J. F., "Contact and rubbing of flat surfaces", J. Appl. Phys., 24, pp.981~988 (1953)[DOI]
- Kogut, L., "Elastic-plastic contact analysis of a sphere and a rigid flat", Trans. ASME, J. Applied Mechanics, 69, pp.657~662 (2002)[DOI]
- Kogut, L., "A finite element based elastic-plastic model for the contact of rough surfaces", Tribol. Trans., 46, pp.383~390 (2003)[DOI]
- Beheshti, A., "Asperity micro-contact models as applied to the deformation of rough line contact", Tribol. Int., 52, pp.61~74 (2012)[DOI]
- Ligterink, D. J., "Measurements of wear in radial journal bearings", Tribotest Journal, 3(1), pp.45~ (1996)
- Patir, N., "An average flow model for determining effects of three-dimensional roughness on partial hydrodynamic lubrication", ASME J. Lubr. Technol., 100, pp.12~17 (1978)[DOI]