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열해석을 이용한 Butterfly Valve의 초저온환경에서의 구조안전성 평가
조영직(Young-Jik Jo),박한석(Han-Seok Park),김세훈(Se-Hun Kim),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
A cryogenic butterfly valve is used to transfer the liquefied natural gas (LNG) which temperature is -162 ℃. This valve is core part in the piping system using LNG. This paper performed coupling analysis using FEM to evaluate safety of cryogenic butterfly valve. Flow analysis is calculated numerically the CAE and CFD methods are useful to predict the thermal matter and the inner flow field of the valve. Thermal analysis and structural analysis used ANSYS Workbench.
조영직(Young-Jik Jo),송학관(Xueguan Song),김세훈(Se-Hun Kim),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
Shape memory alloy (SMA)has been used to improve the tensile strength of composite materials. Because it produces compressive residual stress in the matrix by using its shape memory effect. In order to fabricate a shape memory alloy composite, TiNi alloy and A12024, Al606l were used as reinforcing material and matrix, respectively. In this study, TiNi/A12024 and TiNi/Al606l shape memory alloy composites were made by the hot press method. The fatigue limit of a shape memory alloy composite determined the volume ratio and reduction ratio. The probabilistic stress-life curve (P-S-N curve) about the shape memory alloy composite makes up using statistical method.
TiNi/Al6061-T6과 TiNi/Al2024-T4 형상기억복합재료에 대한 피로강도기준의 비교
조영직(Young-Jik Jo),박영철(Young-Chul Park) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.2
This study produced a design curve and fatigue limit for a variation in volume ratio and reduction ratio of TiNi/Al composites. In many cases, stress-life curve does not indicate fatigue limit, so it was presented by probabilistic-stress-life curve. Goodman diagram was used to analyze the fatigue strength of materials with a finite life determined by repeated load and the fatigue strength of endurance limit with an infinite life. The fatigue experiment was conducted using the scenk-type plane bending specimen in same shape. The result of the fatigue test, which had been conducted under consistent stress amplitude, was examined. (ⅰ) The optimal condition for TiNi/Al in accordance with hot pressing (ⅱ) Impacts of fatigue limit caused by a variation in reduction ratio and volume ratio of TiNi/Al composites (ⅲ) Probability distribution for fatigue limit of TiNi/Al2024 and TiNi/Al6061.
조영직(Young-Jik Jo),전언찬(Eeon-chan Jeon),강정호(Jung-ho Kang) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
Independent suspension axle and final reduction gear for special-purpose vehicles such as a armored vehicles are almost imported in Germany etc. so, developing them is necessary to save cost. In severe condition (open fields, water surface driving, obstacle pass), special-purpose vehicles must work well. Drop box, axle and final reduction gear performed static analysis. We know that is possible weight reduction. The purpose of this paper is to find out the optimal shape of final reduction gear's case by means of response surface methodology. The response surface method is the statistical method which can be applied to the non-sensitivity based optimization. The response surface which is constructed by the least square method contains only the polynomial terms so that the global maximum and minimum points are easily obtained.
민감도 해석을 이용한 로우어 컨트롤 암의 구조 최적설계
송병철(Byoung-Cheol Song),조영직(Young-Jik Jo),김주형(Ju-Hyoung Kim),이권희(Kwon-Hee Lee),박영철(Young-Chul Park) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
Recently developed automotive components are of lightweight nature, providing automobiles with a high fuel efficiency and performance. In response to those trends of car developments, this study proposes a structural optimization method for the lower control ann. Lightweight design of lower control am can be achieved through two approaches: design and material technology. In this research, the former includes optimization technology, and the latter the technologies for selecting aluminum as a steel-substitute material. In this research, the design of experiments(DOE) built in ANSYS WORKBENCH are utilized to determine the optimum shape of a Lower Control Arm. And optimum design is compared first model and reduced design variable model that considered sensitivity using orthogonal array.
스프레깅 현상 최소화를 위한 틸팅 패드 베어링의 형상 최적화
김세훈(Se-Hun Kim),박영철(Young-Chul Park),강정호(Jung-Ho Kang),공형걸(Hyeung-Geol Kong),조영직(Young-Jik Jo) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Currently, operated fluid film tilting pad bearing is used as a partition pad, because it is easy to repair and enhance life. But it is generated Fluttering by unloaded of upper pad, and occurred damage which is defined spragging where leading edge of upper pad. Therefore this paper predicts that the amplitude of each pad and the optimal position of Pivot Hole using computer simulation. And this paper performed the research which minimize Spragging shape.
벨로우즈 실 벨브 설계를 위한 밸브 개폐 정도와 유량계수와의 관계
김승규(Kim Seung-Gyu),김세훈(Kim Se-Hun),조영직(Jo Young-Jik),박영철(Park Young-Chul),강정호(Kang Jung-Ho) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The valve is used on control of flow in a ship. Flow coefficient of valve is very importance in the design of valve. In this paper, three-dimensional computer simulations by commercial code CFX were conducted to observe the valve type and to measure flow coefficient when valves with various angles and uniform incoming velocity were used in a piping system. By contrast, a group of experimental data is used to compare with the data obtained by CFX simulation to investigate the validity of numerical method.
김세훈(Se-Hun Kim),김승규(Seung-Gyu Kim),조영직(Young-Jik Jo),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
Design technology and speciality production technology to manufacture high quality valve are insufficient in Korea. In order to design the experiments using Taguchi method and Variational Technology Also, from verification of the response model with optimized results was confirmed that usefulness and reliance of application Taguchi method and Variational Technology to structural's optimum design using Taguchi method and Variational Technology.