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경계조건의 영향에 따른 Miniature globe valve 내의 유동특성에 관한 연구
박재현(J.H. Park),정호승(H.S. Jeong),김정환(J.H. Kim),김정렬(J.R. Kim),이민우(M.W. Lee),이화신(H.S. Lee),김동균(D.K. Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
글로브 밸브(Globe valve)는 유체수송을 위한 각종 배관망에 널리 사용되고 있는 유체 기계의 일종으로 유로부에 대해서 디스크가 수직으로 개폐가 되는 특징을 가지는 특성으로 인해서 압력강하가 많이 발생하는 특징을 가진다. 글로브 밸브에 대한 수치해석적인 연구가 활발하게 이루어지고 있으며 특히 LNG나 수소와 같은 극저온기체의 사용량이 늘어남에 따라 이에 대한 연구도 활발하게 이루어지고 있다. 본 연구에서는 글로브 밸브에 대한 수치해석적인 연구에서 있어 컴퓨터 계산 자원의 한계로 인한 symmetric 경계조건의 사용 여부가 유동해석에 미치는 영향을 분석하여 사용여부의 타당성을 분석하여 향후 밸브 내부 유동에 대한 연구에 기초자료로 활용하고자 한다.
산업용 교반기의 임펠러 형상의 변화에 따른 유동특성에 관한 실험적 연구
박재현(J.H. Park),김정환(J.H. Kim),김정렬(J.R. Kim),정호승(H.S. Jeong),이민우(M.W. Lee),이화신(H.S. Lee),권지혁(J.H. Kweon),김동균(D.K. Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Industrial agitators are used in various industrial fields where they are necessary to intimately mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. The present study aims for clarify unsteady flow characteristics induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types, Screw type, Rushton turbine type and etc.
김진훈(J. H. Kim),이수종(S. J. Lee),이우현(W. H. Lee),김정렬(J. R. Kim) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
Technology of vehicle industry has been developing and it is required a better vehicle performance than before. Therefore, the consumers are asking not only an economic efficiency, functionality, polished design, ride comfort and silence but also a driving stability. The ride comfort, silence and driving stability are influenced by the size of vehicle and various facilities. But the principal factor is a room noise and vibration sensed by a driver and passenger. Thus, the NVH of vehicle has been raised and used as a principal factor for evaluation of vehicle performance. The primary objective of this study is an optimized design of powertrain mounting system. To optimized design was applied MSC.Nastran optimization modules. Results of dynamic analysis for powertrain mounting system was investigated. By theses results, design variables was applied 12 dynamic spring constant. And the weighting factor according to translational displacement and rotational displacement applied 3 cases. The objective function was applied to minimize displacement of powertrain. And the design variable constraint was imposed dynamic spring constant ratio. The constraint of design variable for objective function was imposed bounce displacement for powertrain.
박재현(J.H. Park),이민우(M.W.Lee),최영규(Y.G. Choi),김정환(J.H. Kim),김정렬(J.R. Kim),정호승(H.S. Jeong) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
This study is used numerical program to analyze characteristics of fluid and structure in the glove valve which is condition pressure 10㎏f/㎠ and temperature -253℃ for transpotaion of liquid hydrogen. It's used 3-D modeling to ㎠ ℃ analyze cryogenic glove valves, which are 1/4˝, 3/8˝. Numerical study used 3D-modeling make a decision of efficient process of product before producing product in the factory.
김진훈(J. H. Kim),이수종(S. J. Lee),이우현(W. H. Lee),김정렬(J. R. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The primary objective of this study is to truly understand exciting forces of the in-line 4 cylinders engine. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand exciting forces, first was governed theoretical equations for single cylinder engine. And this theoretical equations was programming using MATLAB software. To compare theoretical analysis value, was applied MSC.ADAMS software. To determined the specification of engine(2,000㏄, in-line 4) was applied ADAMS/Engine module. And this specification for engine was applied ADAMS/View and MATLAB software. The geometry model for ADAMS/View analysis was produced by the 3-D design modeling software. After imported 3-D model, each rigid body was jointed suitable. Under idle speed for engine, was analysed. The results of analysis are fairly well agreed with those of three analysis method. Using MATLAB software proposed in this study, engine exciting fores can be predicted. Also using ADAMS/Engine module and ADAMS/View software, engine exciting forces can be predicted.
비선형 특성을 적용한 파워트레인 마운팅 시스템의 마운트 전달력 해석
김진훈(J. H. Kim),이수종(S. J. Lee),이우현(W. H. Lee),김정렬(J. R. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The primary objective of this study is to truly understand reaction force be due to engine exciting force. Exciting forces of the engine apply a source of the vehicle NVH(Noise, Vibration, Harshness). To understand reaction force was applied MSC.Nastran software. Analyzed frequency response analysis of powertrain mount system. First, engine exciting force was applied field function. Also nonlinear characteristics was applied field function : such as dynamic spring constant and loss factor. And nonlinear characteristics was applied CBUSH. Generally characteristics of rubber mount is constant frequency. But characteristics of hydraulic mount depend to frequency. Therefore nonlinear characteristics was applied. Powertrain mounting system be influenced by powertrain specification, mount position, mount angle and mount characteristics etc. In this study, we was analyzed effects of powertrain mounting system. And we was varied dynamics spring constant and loss factor of mounts.