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Laser Texturing한 평행 스러스트 베어링의 윤활특성 : 제2보 - 딤플 위치의 영향
박태조(Tae-Jo Park),황윤건(Yun-Geon Hwang) 한국트라이볼로지학회 2010 한국윤활학회지(윤활학회지) Vol.26 No.1
In the last decade, laser surface texturing (LST) has emerged as a viable option of surface engineering. Many problems related with mechanical components such as thrust bearings, mechanical face seals and piston rings, etc, LST result in significant improvement in load capacity, wear resistance and reduction in friction force. It is mainly experimentally reported the micro-dimpled bearing surfaces can reduce friction force, however, precise theoretical results are not presented until now. In this paper, a commercial computational fluid dynamics(CFD) code, FLUENT is used to investigate the lubrication characteristics of a parallel thrust bearing having 3-dimensional micro-dimple. The results show that the pressure, velocity and density distributions are highly affected by the location and number of dimple. The numerical method and results can be use in design of optimum dimple characteristics, and further researches are required.
미세 포켓이 있는 무한장 Slider Bearing의 CFD 해석
박태조(Tae-Jo Park),황윤건(Yun-Geon Hwang),손자덕(Ja-Deok Sohn),정호경(Ho-Gyeong Chung) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.6
It is reported by many researchers that the textured bearing surfaces, where many tiny micro-pockets or enclosed recesses were incorporated, can enhance the load support and reduce friction force. Recently, the basic lubrication mechanism of micro-pocketed parallel surfaces are explained in terms of "inlet suction" using continuity equation and simply cavitation condition. However, it is required that more actual cavitation condition in the pocket region should be applied to estimate exact bearing performance. In this paper, a commercial computational fluid dynamics(CFD) code, FLUENT is used to investigate the exact lubrication characteristics of infinitely long slider bearing with micro-pocket. The results show that the pressure distributions are highly affected by pocket depths, its positions and numbers. The numerical method adopted in this paper and results can be use in design of textured sliding bearings.
그루브가 있는 사판식 유압피스톤 펌프용 Slipper Bearing의 윤활특성
박태조(Tae-Jo Park),황윤건(Yun-Geon Hwang),김관준(Kwan-Joon Kim),손자덕(Ja-Deok Sohn) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
In this thesis, FLUENT is adopted to investigate accurate flow characteristics for a tilted and grooved rotating slipper bearing which is used swash plate type hydraulic axial piston pump. Static pressure and velocity distributions, and velocity vectors are plotted for different radial groove position. In case that slipper bearing is rotating, the flow fields of tilted and grooved slipper bearing are highly asymmetrical. Static pressure, bearing load, tilting moment acting on bearing and leakage flow rate are highly affected by radial groove position, rotation of slipper bearing and film thickness. Therefore the numerical method and results adopted in this paper can be use in design of swash plate type hydraulic piston pump and further studies are required.
Laser Texturing한 평행 스러스트 베어링의 운활특성
박태조(Tae-Jo Park) 한국트라이볼로지학회 2011 한국윤활학회지(윤활학회지) Vol.27 No.6
Laser surface texturing (LST) methods are widely applied recently to reduce friction and improve reliability of machine components such as thrust bearings, mechanical face seals and piston rings, etc. In this paper, numerical analysis is carried out to investigate the effect of number of dimples on the lubrication characteristics of parallel thrust bearing using a commercial computational fluid dynamics (CFD) code, FLUENT. Pressure distributions of present analysis are physically consistent than those obtained from numerical analysis of Reynolds equation. The overall lubrication characteristics are highly affected by number of dimples and their locations. The results can be use in design of optimum dimple characteristics to improve thrust bearing performance and further researches are required.
시일과 스틸면 사이에 구형 입자가 있는 미끄럼 접촉 해석
박태조(Tae-Jo Park),이준혁(Jun-Hyuk Lee) 한국트라이볼로지학회 2012 한국윤활학회지(윤활학회지) Vol.28 No.1
In this paper, a Three elastic body sliding contact problem is modeled to investigate more precise wear mechanisms related with the sealing surface. A 3-D finite element contact model, a small spherical elastic particle. PTFE seal and steel surface, is solved using a nonlinear finite element code MARC. The deformed seal and steel surface shapes, von-Mises and principal stress distributions are obtained for different seal sliding distances. The entrapped small particle within PTFE seal results in very high stresses on the steel surface which exceeded its yield strength and produce plastic deformation such as groove and torus. The sealing surface could also be worn down by sub-surface fatigue due to intervening small particles together with the well-known abrasive wear. Therefore the proposed contact model adopted in this paper can be applied in design of various sealing systems, and further studies are required.