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2차원 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 2009 한국윤활학회지(윤활학회지) Vol.25 No.1
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-pockets. 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 optimal design of textured sliding bearings.
유압용 2차원 Hydrostatic Thrust Bearing의 윤활특성 해석 : 포켓형상의 영향
유재찬(Jae-Chan Yoo),박태조(Tae-Jo Park),손자덕(Ja-Deok Sohn),정호경(Ho-Gyeong Chung) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Most hydrostatic thrust bearings adopt pockets to provide high pressured fluid in bearing land. In this paper, a CFD(computational fluid dynamics) code, FLUENT is adopted to investigate accurate flow and lubrication characteristics for a two-dimensional hydrostatic thrust bearing which has different pocket models such as single and double pocket. Static pressure and streamline distributions, supporting load, mass flowrate are plotted for different orifice diameter, pocket width and shape. The results showed that the pressure distribution and lubrication characteristics are highly affected by pocket geometry. Therefore the numerical methods used in this paper can be used in designing and lubrication performance estimation of hydrostatic thrust bearings for hydraulic machinery.
조현동(Hyeon-Dong Jo),황윤건(Yun-Geon Hwang),박태조(Tae-Jo Park),손자덕(Ja-Deok Sohn),정호경(Ho-Gyeong Chung) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
In tins paper, a deformation analysis is conducted for coaxial elastomeric seals which is adopted in the power-by-actuator for aircraft. An axisymmetric finite element contact model is developed and analyzed using MARC. The deformed seal shapes, contact stress and von-Mises stress distributions for various operating pressures, rod and cylinder clearances. The results presented an optimum design data of coaxial seals for power-by-actuator.
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.