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FEM을 이용한 자동차 타이어용 알류미늄 합금 금형의 열변형 특성에 관한 연구
오율권,서동표,양호동,박근욱,김용범 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
대부분의 타이어 제조를 위한 금형생산 공정은 실험적인 결과에 바탕을 두어 거의 경험치에 의존하고 있다. 이러한 방법은 금형제품을 생산하는데 있어 비효율적이고 비경제적인 측면이 많다. 따라서, 정밀도를 향상시키고 품질이 좋은 타이어를 제조하기 위해 금형의 제조공정은 재평가가 이루어져야 한다. 본 연구에서는 자동차 타이어용 알루미늄 합금 금형의열변형 및 특성을 조사하기 위해 유한요소법을 이용하여 수치해석적으로 연구를 수행하고자 하였다. 알루미늄 합금의 금형의 열변형 및 특성에 관해 조사하기 위해, 알루미늄 합금 금형 내부에서 발생되는 온도분포, 수축량, 응력 그리고 변형량을 수치해석적으로 계산하는연구를 수행하였다. 뿐만 아니라, 정밀도를 향상시키고 좋은 품질의 금형을 얻기 위해, 알루미늄 합금과 연강의 수치해석 결과를 비교하였다. 결국, 수치해석을 통해 얻은 결과들은향후 효과적이고 최상의 금형 제품을 제작하는데 도움을 줄 수 있으리라 본다. Most the mold product process is based on a experimental results and is almost dependent on experiments for tire manufacturing. This method produced the mold product is not only the ineffectiveness but also the bad economy. So, the product process of metal mold should be revaluated to produce the improved precision and good quality of tires. In this study, numerical analysis applied a finite element method (FEM) was used to predict the thermal strain characteristics of Aluminum (AI) alloy mold for automobile tire. To investigate the thermal strain and characteristics of Al alloy mold, it was performed that the temperature distribution. the contraction rates, the stress and the strain occurred on the inside of Al alloy mold was calculated by numerical works. Moreover, numerical analysis results of Al alloy mold were compared with those of mild steel mold in order to obtain the improved precision and good quality of mold. So, the numerical results of this study will be presented to help to make the effective and the best mold products.
서동주,오주환 경운대학교 산업기술연구소 1998 産業技術硏究論文誌 Vol.1 No.1(A)
The optimal ordering system allows the prevention of excess iventory, continuous supply of favored goods and removal of unpopular products so that the needed products can be dispalyed at the needed place at the needed time. Therefore, it can improve customer service rate, reduce stock absence and cost to make company"s competitive power more powerful. The objective paper is intended to study optimal ordering method for effective use of POS data.
수평원관내에서 3상 혼합물의 유동특성에 관한 실험적 연구
서동표,정경진,오율권 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1
Petroleum is one of the most important energy. Recently, it is common to transport petroleum by an pipeline network than by an oiler. However, in this case, serious problem is that we have small knowledge of flow dynamics dealing with multiphase mixture. So the purpose of this study is to show the flow characteristics of the three phase flow among water, oil and air in the horizontal pipe and supply necessary data to engineers who design transport pipes. In order to investigate of a flow characteristics, the experimental results were compared each other on the basis of observations between oil and water, oil and air, and water and air.
UML 역공학 프로세스 모델링을 이용한 Jetspeed 사용자 인터페이스 분석
오동식,구흥서 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.22 No.3
Reverse Engineering of software is the process of constructuring high level specifications from lower level instantiations of an existing software system. While extracting design specification from source code have had some success in Logical view of the UML, they are unlikely to be able to completely extract Design Diagrams of UML. Because source code does not represent all of Design Information an effort to recover Design Specifications from an existing software system have limitation. To address this problem, this paper describes User-Interface based Reverse Engineering to improve Extracting the UML Diagrams.
Air-Water 모델에서 액상의 유동특성에 관한 연구
오율권,서동표,박설현 한국안전학회 2004 한국안전학회지 Vol.19 No.1
In the present study, the gas injection system based on air-water model was designed to investigate the flov< characteristics of liquid phase. A PIV system was applied to analyze the flow pattern in a ladle which gas started to rise upward from the bottom. Gas flow is one of most important factors which could feature a flow pattern in a gas injection system. As the gas injected into the liquid, the kinetic energy of bubble transfer to liquid phase and a strong circulation flow develops in the liquid phase. Such a flow in the liquid develops vortex and improve the mixing process. Due to the centrifugal force, circulation flow was well developed near both wall sides and upper region respectively. Increasing gas flow was helpful to remove dead zone but, weak flow zone still exists in spite of the increasement of gas flow rate.
오율권,서동표 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.1
In the air-water model, the characteristics of flow parameters were experimentally investigated. When gas was injected into the liquid bath, several flow patterns were observed bubble-liquid plumb, the spout flow that occurred at the free surface, liquid circulation flow by bubble's behavior, etc. In the pure liquid region, the large and small several vortices were formed and irregularly circulated. These irregular repetition and circulation play a important role of mixing in the bath. The vortices were developed in the upper and the side wall regions and the movement of flow in the low region was very small. It is known as "dead zone". The bubble rise velocity in the bottom region was relatively lower than in the upper region because the energy generated by bubbles' behavior in the near nozzle region was almost converted into kinetic energy. But bubble rise velocity increases with the increasing the axial distance since kinetic energy of bubbles is added to buoyancy force.
오율권,양호동,서동표 조선대학교 에너지.자원신기술연구소 2004 에너지·자원신기술연구소 논문지 Vol.26 No.2
Applying ultrasonic waves in a medium enhance the heat transfer, judging from the facts that applying ultrasonic waves to the liquid medium gives rise to areas of high and low local pressure. Therefore, in the present study, a coupled finite element-boundary element method(FE-BEM) was used to calculate the acoustic pressure in a medium. For the numerical analysis, we performed the process of finite element modeling. This modeling data was converted to the boundary element data by SVS(Structure Vibtation Simulator). SVS programmed was composed of FORTRAN language and based on a coupled FE-BEM. The results of numerical analysis reveal that acoustic pressure is increased by 60% at the ultrasonic intensity of 340W and the higher acoustic pressure distribution near two ultrasonic transducers.
서동표,황세준,오율권 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
Gas-injected system can be applied to various field such as metallurgical and chemical processing operations. So this study aims at presenting the relevant relationship between gas phase and liquid phase in gas-injected bath. The volume fraction, velocity, and temperature distribution of each phase were measured in order to predict the flow characteristics in gas-injected system. The gas discharged into the liquid bath loses its kinetic energy in a short distance from the nozzle exit, and then rises with a relatively uniform velocity due to buoyancy. As the gas rises upward in the liquid, the liquid entrains into the rising gas and a gas-liquid two-phase plume forms. In vertical injection systems, the gas-liquid plume is symmetric about the axis of the injection nozzle. In the region close to the orifice exit, the flow variables show steep spatial changes in both directions along the plume and across the plume. This region can be charaterized as a developing flow region.