미세 그루브가 있는 무한폭 Slider 베어링의 윤활해석:제2보 - 그루브 깊이의 영향
Lubrication Analysis of Infinite Width Slider Bearing witha Micro-Groove: Part 2 - Effect of Groove Depth
1
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
It is currently well known that surface textures act as lubricant reservoirs, entrap wear debris, and hydrodynamic bearings, which can lead to certain increases in load-carrying capacities. Until recently, the vast majority of research has focused on parallel sliding machine components such as thrust bearings, mechanical face seals, piston rings, etc. However, most sliding bearings have a convergent film shape in the sliding direction and their hydrodynamic pressure is mainly generated by the wedge action. Following the first part of the present study that investigates the effect of groove position on the lubrication performances of inclined slider bearings, this paper focuses on the effects of groove depths and film thicknesses. Using a commercial computational fluid dynamics (CFD) code, FLUENT, the continuity and Navier–Stokes equations are numerically analyzed. The results show that the film thickness and groove depth have a significant influence on the pressure distribution. The maximum pressure occurs at the groove depth where the vortex is found and, as the depth increases, the pressure decreases. There is also a groove depth to maximize the supporting load with the film thickness. The friction force acting on the slider decreases with deeper grooves. Therefore, properly designed groove depths, depending on the operating conditions, can improve the load-carrying capacity of inclined slider bearings as compared to the bearings without a groove.
Abstract
It is currently well known that surface textures act as lubricant reservoirs, entrap wear debris, and hydrodynamic bearings, which can lead to certain increases in load-carrying capacities. Until recently, the vast majority of research has focused on parallel sliding machine components such as thrust bearings, mechanical face seals, piston rings, etc. However, most sliding bearings have a convergent film shape in the sliding direction and their hydrodynamic pressure is mainly generated by the wedge action. Following the first part of the present study that investigates the effect of groove position on the lubrication performances of inclined slider bearings, this paper focuses on the effects of groove depths and film thicknesses. Using a commercial computational fluid dynamics (CFD) code, FLUENT, the continuity and Navier–Stokes equations are numerically analyzed. The results show that the film thickness and groove depth have a significant influence on the pressure distribution. The maximum pressure occurs at the groove depth where the vortex is found and, as the depth increases, the pressure decreases. There is also a groove depth to maximize the supporting load with the film thickness. The friction force acting on the slider decreases with deeper grooves. Therefore, properly designed groove depths, depending on the operating conditions, can improve the load-carrying capacity of inclined slider bearings as compared to the bearings without a groove.
참고문헌 (19)
- Cameron, A., "The principle of lubrication" (1965), John Wiley and Sons
- Holmberg, K., "Global energy consumption due to friction in passenger cars", Tribol. Int., 47, pp.221~234 (2012)
- Etsion, I., "State of the art in laser surface texturing", ASME J. Tribol., 127(1), pp.248~253 (2005)
- Sudeep, U., "Performance of lubricated rolling", sliding concentrated contacts with surface textures: A review, 2015, pp.137(3), 031501~
- Ibatan, T., "Recent development on surface texturing in enhancing tribological performance of bearing sliders", Sur. Coating Technol., 272, pp.102~120 (2015)
- Gropper, D., "Hydrodynamic lubrication of textured surfaces: A review of modeling techniques and key findings", Tribol. Int., 94, pp.509~529 (2016)
- Brizmer, V., "A laser surface textured parallel thrust bearing", Tribol. Trans., 46(3), pp.397~403 (2003)
- Olver, A. V., "‘Inlet suction’, a load support mechanism in non-convergent, pocketed, hydrodynamic bearings", Proc. IMechE., J. Eng. Tribol., 220(2), pp.105~108 (2006)
- Fowell, M., "Entrainment and inlet suction: Two mechanisms of hydrodynamic lubrication in textured bearings", ASME J. Tribol., 129(2), pp.221~230 (2007)
- Brajdic-Mitidieri, P., "CFD analysis of a low friction pocketed pad bearing", ASME J. Tribol., 127(4), pp.803~812 (2005)
- Sahlin, F., "Two-dimensional CFD-analysis of micro-patterned surfaces in hydrodynamic lubrication", ASME J. Tribol., 127(1), pp.96~102 (2005)
- 정요한, "Surface Texturing한 평행 스러스트 베어링의 열유체윤활 해석: 딤플 반경과 깊이의 영향", 한국트라이볼로지학회지, 30(5), pp.303~310 (2014), 한국트라이볼로지학회[DOI]
- Caramia, G., "Hydrodynamic lubrication of micro-textured surfaces: Two dimensional CFD-analysis", Tribol. Int., 88, pp.162~169 (2015)
- 박태조, "Surface Texturing한 평행 슬라이더 베어링의 열유체윤활 해석: 딤플 깊이의 영향", 한국트라이볼로지학회지, 33(6), pp.288~295 (2017), 한국트라이볼로지학회[DOI]
- Rom, M., "An effective Navier-Stokes model for the simulation of textured surface lubrication", Tribol. Int., 124, pp.247~258 (2018)
- Cupillard, S., "Pressure buildup mechanism in a textured inlet of a hydrodynamic contact", ASME J. Tribol., 130(2), pp.1~10 (2008)
- Papadopoulos, C. I., "Geometry optimization of textured three-dimensional micro-thrust bearings", J. Tribol., 133(4), pp.041702~ (2011)
- 박태조, "미세 그루브가 있는 무한폭 Slider 베어링의 윤활해석:제1보 - 그루브 위치의 영향", 한국트라이볼로지학회지, 35(6), pp.376~381 (2019), 한국트라이볼로지학회[DOI]
- "ANSYS FLUENT User Guide, Release 14.0", ANSYS,Inc., ~ (2011)