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이준혁(J. H. Lee),이준오(J. O. Lee),박태조(T. J. Park) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
O-ring seal is widely used in various mechanical devices to prevent mainly leakage of working fluid and incursion of foreign particle. When O-ring is used as a piston seal, the sealing performances are determined by various design parameters such as initial interference, fluid pressure and the clearance gap between piston and cylinder. In this paper, a nonlinear problem solver, MARC, is adopted to analyze the effect of piston eccentricity and fluid pressure on the deformation characteristics of O-ring seal. The results show that the eccentricity of piston can reduce highly the ability of the seal, and then cause easily leakage of fluid.
Micro-texturing한 Slider-bearing의 윤활특성
이준오(J. O. Lee),정요한(Y. H. Jeong),장명준(M. J. Jang),박태조(T. J. Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Surface texturing methods are widely applied recently to reduce friction and improve reliability of machine components such as parallel thrust bearings, mechanical face seals and piston rings, etc. In this paper, numberical analysis is carried out to investigate the effect of uniformly spaced hemispherical dimples on the lubrication characteristics of slider bearing using a commerical computational fluid dynamics (CFD) code, FLUENT. The pressure distributions, load capacity, leakage flowrate and friction force are highly affected by dimple diameter and their numbers. Especially load capacity and friction force decrease linearly with dimple density whereas leakage increase. The results can be use in design of optimum characteristics to improve lubrication performances of slider bearing and further researches are required.
Surface Texturing한 유압부품면에서의 윤활특성
이준오(J. O. Lee),정요한(Y. H. Jeong),박태조(T. J. Park) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
Friction reduction between sliding hydraulic machine components is required to improve efficiency and reliability of hydraulic machineries. It is recently reported that surface texturing on sliding bearing surfaces can reduce the friction force highly. In this paper, numerical analysis is carried out to investigate the effect of dimple numbers and inlet boundary pressures on the lubrication characteristics of parallel sliding bearing using a commercial computational fluid dynamics (CFD) code, FLUENT. The results show that the pressure distribution, load capacity, dimensionless friction force and leakage with dimple number and location, and inlet pressures. The overall lubrication characteristics are highly affected by dimple numbers and boundary pressure. The numerical method adopted and results can be use in design of efficient hydraulic machine components.
이준오(J. O. Lee),박태조(T. J. Park) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.4
Friction reduction between sliding hydraulic machine components is required to improve efficiency and reliability of hydraulic machineries. It is recently reported that surface texturing on sliding bearing surfaces can reduce the friction force highly. In this paper, numerical analysis is carried out to investigate the effect of dimple numbers and inlet boundary pressures on the lubrication characteristics of a parallel sliding bearing using a commercial computational fluid dynamics (CFD) code, FLUENT. The results show that the pressure distribution, load capacity, dimensionless friction force and leakage with dimple number and their locations, and inlet pressures. The overall lubrication characteristics are highly affected by dimple numbers and boundary pressure. The numerical method adopted and results can be used in design of efficient hydraulic machine components.