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문병영(B.Y. Moon),송우진(W.J. Song),김용욱(Y.W. Kim),강범수(B.S. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper presents an analytic method and a design technique for golf shoes with coolant in the<br/> insole. The golf shoes are modeled using the finite element method for precision by considering the<br/> configuration of the insole, the midsole and the outsole, which compose the golf shoes. The values of<br/> standard human foot temperature for heat transfer boundary conditions are adopted for the FEA(Finite<br/> Element Analysis). By the commercial FEM software for heat transfer analysis, MARC V7.3, the<br/> temperature and the amounts of heat flux change for the insole are obtained, respectively. It can be<br/> concluded that results obtained by FEM in the insole are different depending on the characteristic of<br/> heat transfer. The results reported herein provide better understanding of analyzing the golf shoes.<br/> Moreover, it is believed that those properties of the results can be utilized in the shoes industry to<br/> develop the effective design method.
Sail 요트의 공기력에 대한 강체 모형의 광역 파라미터에 관한 기초 연구
선민영,문병영,Sun, M.Y.,Moon, B.Y. 한국마린엔지니어링학회 2014 한국마린엔지니어링학회지 Vol.38 No.4
In the design of sailing yachts, the analysis of aerodynamic forces exerted on sails is very important to predict the performance of propulsion of a ship. To understand the essential flow physics around the sail, a simplified rigid-body sail model is proposed in this study. Four parameters such as free stream velocity, angle of attack, maximum width of sail, and camber length are considered as the independent variables. Lift and drag coefficients are computed with CFD technique using ANSYS-CFX, and the results with the visualization of flow field are analyzed in the viewpoint of fluid dynamics. 본 연구에서는 범선형 요트에 작용하는 공기력을 해석하기 위하여 매우 단순화된 표준 강체 모형을 제시하였다. 모델의 전산유체역학 해석을 통하여 자유류 속도, 받음각, 돛의 최대 폭, 캠버 길이에 대한 광범위 파라미터 연구를 실시하였다. 삼각 돛과 사각 돛에 대한 양력계수와 항력계수가 분석되었으며, 각각의 인자에 대한 물리적 해석을 실시하였다. 자유류 속도에 대해서 주어진 인자 범위의 Reynolds 수영역 내에서 삼각 돛은 캠버와 공력 계수가 순방향의 민감도를 보이는 반면, 사각 돛은 역방향의 민감도를 보이는 사실을 확인하였다. 또한 와도의 분석 결과 돛 뒷면의 앞전에서 발생하는 유동 박리에 의한 와류 강도의 복잡한 3차원적 간섭에 의해 후류의 와도가 영향을 받는 것으로 밝혀졌다. 이러한 연구를 통하여 돛의 주변에 나타나는 유동 물리 현상을 좀 더 깊이 이해하고 추후 범선형 요트 설계를 위한 주요 외력 인자와 민감도를 기저 값으로 이용하여 요트를 설계하고자 한다.
구름마찰접촉하중 시Polyethylene tibia 요소의 표면균열 복합전파 거동에 관한 연구
김병수(B.S. Kim),문병영(B.Y. Moon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Pitting wear is a dominant form of polyethylene surface damage in total knee replacements, and may<br/> originate from surface cracks that propagate under repeated tribological contact. In this study, stress intensity<br/> factors, I K and II K , were calculated for a surface crack in a polyethylene . CoCr . bone system under the<br/> rolling and/or sliding contact pressures. Crack length and load location were considered in determination of<br/> probable crack propagation mechanisms and fracture modes. Positive I K values were obtained for shorter<br/> cracks in rolling contact and for all crack lengths when the sliding load was apart from the crack. II K was<br/> the greatest when the load was directly adjacent to the crack (g/a=..1). Sliding friction caused a substantial<br/> increase of both max<br/> I K and max<br/> II K . The effective Mode I stress intensity factors, eff K , were the greatest at<br/> g/a=..1, showing the significance of high shear stresses generated by loads adjacent to surface cracks. Such<br/> behavior of eff K suggests mechanisms for surface pitting by which surface cracks may propagate along their<br/> original plane under repeated rolling or sliding contact.
Emulsion법에 의한 실리카 분말의 합성에서 반응조건이 입자의 형성에 미치는 영향
이상근,장윤식,문병영,강범수,박희찬,Lee S. G.,Jang Y. S.,Moon B. Y.,Kang B. S.,Park H. C. 한국재료학회 2005 한국재료학회지 Vol.15 No.11
Silica powders were synthesized using emulsion solution containing water, nonionic surfactant of Triton N-57, and cyclohexane. Silica powders were prepared at low cost using inexpensive starting material of sodium silicate and ammonium sulfate. Morphology, size and size distribution were observed and determined using SEM. The powder was identified as silica by FT-IR and XRD analysis. Particle size and size distributions were affected by concentration of reactants, reaction time, and concentration of surfactant. Particle size were increased with increasing concentration of reactants and particles became dense with increasing reaction time. As R value increased, tile particle size was increased, reached a certain value and then decreased again. The silica powders synthesized under optimum condition were spherical in shape, $0.8{\mu}m$ in average particle size, narrow in particles size distribution, and well dispersed.
김광훈(K. H. Kim),문병영(B. Y. Moon),김병수(S. B. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Weatherstrip seals protect passengers form noise, dust, rain and wind out of the vehicle. The more contact area between a body frame and a weatherstrip, the higher efficiency of sealing. A weatherstrip is a sort of an elastomer. Mechanical properties of the weatherstrip is obtained by uniaxial tension test. In this study, nonlinear finite element(FE) analysis is performed to obtain displacements and contact shapes of the weatherstrip. The FE model is developed by using Ogden-foam formulation. In the results of nonlinear FE analysis, the most valuable deformation of the weatherstrip occurred when displacement control value reaches 7.2㎜. Severe deformation is observed as the displacement control value become more increased.
박정홍(J. H. Park),손권(K. Son),김광훈(G. H. Kim),문병영(B. Y. Moon),서정탁(J. T. Suh) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The isometric position of the anterior cruciate ligament was calculated during flexion-extension. Flexion-extension motion data of the knee joint were obtained by Fastrak, a three-dimensional motion measurement system. A subject was seated on a flat table and the tibia sensor position was measured with the femur fixed at the table. A three-dimensional knee model was constructed using a graphic tool to simulate the knee motion. Three surgical positions of the femoral tunnel were selected and the distances between the determined tibial tunnel and each femoral tunnel were calculated. The maximum elongation position was found to be in the ten thirty direction of clock.