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조종래(Jong-Rae Cho),곽기열(Gi-Youl Kwak),정재헌(Jae-Hyun Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A cabinet of refrigerator is mainly composed of ASS copolymer, polyurethane(PU) foam and steel plate for insulation and support of structure. Outer plate is deformed in the circumference of duct which is interchanged between refrigerating room and freezing room as cold air stream and it is very difficult to prevent deformation because the reasons of deformation are not defined clearly. On this study finite element analysis of theoretical numerical analysis was applied to estimate deformation of cabinet and outer plate of duct region as constructing a finite element model and phenomenal analysis. The factors which affect deformation on outer plate of duct region were evaluated and the new design is also suggested to minimize deformation. It was suggested that the shape of flat duct which has rib at the end part of it can fill the empty space with PU-foam makes a smooth curved surface.
자기연마기술을 이용한 고속절삭공구의 성능향상에 관한 연구
조종래(Jong Rae Cho),양순철(Sun Cheul Yang),정윤교(Yoon Gyo Jung) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.1
The magnetic fluid polishing technique can polish the tool of complex shape, because the polishing method which polishes as compress the workpiece by the magnetism abrasives to arrange to the linear according to the line of magnetic force. Therefore, we producted the magnetic fluid polishing device in order that mirror like finishing processes the tool surface. In order to a polishing condition selection, polishing characteristic was estimated by polishing conditions which are magnetic flux density, polishing speed, grain size, magnetic fluid. The tool was polished to the selected polishing condition. The result to evaluate the polished tool’s performance with the cutting force and tool wear, the polished tool's performance was improved compared with the tool not to polish.
조종래(Jong-Rae Cho),송상현(Sang-Hyun Song),전우진(Woo-Jin Jeon),박진성(Jin-Sung Park),정호승(Ho-Seung Jeong),김창수(Chang-Soo Kim),김현준(Hyun-Jun Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
The objective of this study is to estimate the thermo-mechanical performance of cross corrugated plate with geometrical parameters in plate heat exchanger. Solid element needs a lot of elements and requires longer computational time, whereas shell element and sub model require less number of elements and computational time. For this reason, development of analysis technique is required. Based on the analysis technique, parametric analysis was performed applying parameters as plate thickness, pitch/height ratio and intersection angles. By the parametric analysis, we understand the characteristics for corrugated plate. in plate heat exchanger.
조종래(Jong-Rae Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Nuclear power equipments are required the dynamic and sloshing analyses based on the earthquake spectrum and static analysis on normal loading including pressure and nozzle loading to verify the structural integrity of the equipment The structure was modeled using finite element techniques. Calculated stresses from finite element model are evaluated in accordance with design criteria of KEPIC MCN, 2000 or ASME B&PV code. In this paper, the special loading for equipment design and analysis examples are introduced.
조종래(Jong Rae Cho),정해영(Hae Young Jung),배원병(Won Byung Bae),이우형(Woo Hyung Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
The objective of this paper is to predict buckling pressure for composite cylindrical shell using buckling formula (ASME 2007, NASA SP 8007) and finite element analysis. The model of this study has stacking angle [0/90]12t and is made of USN 125 composite material. All specimens were made using pre-preg method. The study method of this paper is that numerical analysis, finite element analysis and buckling formula, is conducted, compared and verified through hydrostatic pressure buckling experiments. Second, the values of buckling formula and buckling pressure values of finite element analysis were compared, while the stacking angie was made to change by 5 degrees from 20 degrees to 90 degrees. The linear and nonlinear results of finite element analysis is compliant with results of experiment as safety factor 0.85 ~ 1. Based on the result above, the ASME 2007 formula, a simplified version of the NASA SP-8007 formula is regarded as a buckling formula in which more reliable safety factors are considered.
조종래(Jong Rae Cho),이상태(Sang Tea Lee),정윤교(Yoon Gyo Jung) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
As the industrial development is accelerated, a new machining process and system are keenly required to achieve super precision surface finish. Especially to get ground surface finish for complicated and narrow inner shape of molds, it is impossible with the existing methods so that a new method is being required to be developed. A new material; called Magic(MAGnetic Intelligent Compounds), is finally made and it is called Magic machining that uses this material. There is a way to make a material as follows, the mixture of magnetic particles, bonding material and particles of abrasive grain should be melt down by proper heat, and then this mixture put in a mold and cool down in magnetic field which has a uniform direction. This new polishing method is spotlighted as an excellent solution to the existing problems. However it hasn't reported any study about the influence of the machining conditions of polishing velocity, amplitude and polishing pressure to the surface roughness yet. This study would examine closely the influence of polishing conditions of. the Magic polishing tool to the surface finish to decide the optimum polishing condition and to standardize the Magic polishing work.