http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
홍석관,강정진,변철웅,Hong, Seok-Kwan,Kang, Jeong-Jin,Byun, Cheol-Woong 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.3
This study is aimed to analyse the laser glass bonding process numerically. Due to the viscoelastic behaviour of glass, the extremely large deformation of the frit seal is resulted continuously over the transition temperature, so that the thermal boundary condition be changed in the entire calculation process. The commercial FEM algorithm is restrictively able to remesh the large geometrical boundary shape and to adapt the boundary conditions simultaneously. According to our manual adaptation of increasing the laser line intensity to 700 mW/mm, it is possible to estimate the thermal glass bonding process under the fracture stress in principle. But it should be studied further in the case of high laser line intensity.
이상우,신대영,변철웅,Lee, Sang-Woo,Shin, Dae-Young,Byun, Cheol-Woong 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.5
소화시스템에 사용되는 고압의 소화가스 저장용기에는 저장용기의 파손을 막아주는 안전밸브가 있다. 이러한 안전밸브의 내부에는 원형 박판의 파열 판이 들어 있는데, 저장용기의 내압이 위험수준에 도달하면 파열 판이 파손하여 내압을 배출하는 역할을 한다. 안전밸브의 설계인자는 파열 판의 두께, 안전밸브의 유로 직경, 플라스틱 패킹 링의 내부 직경 그리고 파열 판을 고정하는 볼트 안쪽의 필렛 반경이 있다. 이중에서 파열 판의 두께는 0.2mm로 고정을 하였다. 요인배치법을 사용하여 주효과를 결정하였고 회귀방정식을 유도하였다. 이러한 회귀방정식은 추후 안전밸브의 설계에 있어서 기초 설계 자료로서 활용할 수 있도록 실험 결과와 비교하여 검증하였다. 검증실험 및 회귀방정식에 의한 결과의 오차는 약 $2{\sim}5%$ 정도인 것을 확인하였다. 그리고 반응표면법을 사용하여 기밀테스트 압력인 25MPa에서 파열할 수 있는 안전밸브의 최적 모델을 결정하였다. High pressure storage of the agent gas in fire suppression system was composed of tank, main valve and safety valve, which prevents the fracture of the high pressure storage. The safety valve has circular thin plate as fracture plate that was destroyed over fracture pressure. When inner pressure of the storage is reached the fracture pressure, the safety valve discharges gas and degrades simultaneously the inner pressure of the storage. There are design variables such as flow path diameter, inner diameter of the plastic packing ring, thickness of plate and fillet radius. In this variables, thickness of plate is set to be a value of 0.2mm. The main effect of variables on the inner pressure, has been decided using factorial design and statistical analysis. Therefore, the relation of variables are expressed by regression equation. It is disclosed results that the difference of fracture pressures between the equation and experiment has $2{\sim}5%$. Finally, using response surface method, the optimal design of the safety valve could be decided with safety pressure of 25MPa, where the fracture occurs on circular thin plate.
양진석(Yang Jin Seok),변철웅(Byun Cheol Woong),신대영(Shin Dae Young) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
Optical absorptance of the plastic material is a critical parameter in the quality of weld seam during the laser plastic welding process, and frequent measurements of this value are required because material properties of the plastics can fluctuate greatly due to the change of the processing parameters such as compound mix and injection molding process variables. Absorptance is usually estimated indirectly by measuring the transmittance and reflectance of the material. Accurate measurement devices based on several principles, spectroscopic apparatus, integrating sphere, calorimetry method, for instance, have been developed and some are commercially available in the market. But these are not adequate for the regular use in the production field. In this work, portable equipment is developed for measuring absorptance with reasonable accuracy, convenience and angle dependent measuring capability. Measuring principle and instrumentation are described, and measurement results of PMMA and ABS plastic materials are presented.
양진석(Yang Jin Seok),변철웅(Byun Cheol Woong),신대영(Shin Dae Young) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Optical absorptance of the plastic material is a critical parameter in the quality of weld seam during the laser plastic welding process, and frequent measurements of this value are required because material properties of the plastics can fluctuate greatly due to the change of the processing parameters such as compound mix and injection molding process variables. Absorptance is usually estimated indirectly by measuring the transmittance and reflectance of the material. Accurate measurement devices based on several principles, spectroscopic apparatus, integrating sphere, calorimetry method, for instance, have been developed and some are commercially available in the market. But these are not adequate for the regular use in the production field. In this work, portable equipment is developed for measuring absorptance with reasonable accuracy, convenience and angle dependent measuring capability. Measuring principle and instrumentation are described, and measurement results of PMMA and ABS plastic materials are presented.
유병철(Byung-Chul Yoo),이건상(Kun-Sang Lee),변철웅(Cheol-Woong Byun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Most industrial products nowadays have been manufactured by being made up of many parts that these are made from various kinds of materials. These parts and goods should be disassembled simply and classified easily by material or kinds of parts for the recycling. But it is not so easy to know how to take disassembly ways and those orders must be known and also analyzed the assembled points and directions of the every part. This research presents an design process for recycling that it will be considering whole design process for recycling about easiness of disassembling units as the prior condition to reuse the parts and used material, and to reduce waste parts.
홍석관(Seok Kwan Hong),강정진(Jeong Jin Kang),변철웅(Cheol Woong Byun) 한국레이저가공학회 2008 한국레이저가공학회지 Vol.11 No.3
This study is aimed to analyse the laser glass bonding process numerically. Due to the viscoelastic behaviour of glass, the extremely large deformation of the frit seal is resulted continuously over the transition temperature, so that the thermal boundary condition be changed in the entire calculation process. The commercial FEM algorithm is restrictively able to remesh the large geometrical boundary shape and to adapt the boundary conditions simultaneously. According to our manual adaptation of increasing the laser line intensity to 700 ㎽/㎜, it is possible to estimate the thermal glass bonding process under the fracture stress in principle. But it should be studied further in the case of high laser line intensity.
FPD 산업용 Laser Glass Cutting 기술 개발
박종덕(Jong Duk Park),오대현(Dae Hyun Oh),변철웅(Cheol-Woong Byun),문경일(Kyong-il Moon) 한국레이저가공학회 2007 한국레이저가공학회 학술대회 논문집 Vol.2007 No.-
최근까지 기판재료의 절단은 유리의 취성을 이용한 기계적 분단 방식으로 주로 이용되고 있다. 그러나 동일한 취성으로 인하여 절단면 모서리에서 마이크로 크랙이 발생하므로, 이 마이크로 크랙을 제거하기 위하여 연마와 세정과 같은 추가 공정이 필요하게 되는 등 많은 문제를 갖고 있다. 그러므로 이 문제를 해결하기 위하여, 세계적으로 여러 연구소나 회사에서 열응력을 이용한 레이저를 이용한 절단 기술이 제안되었으나, 공정 자체와 대형화에 따른 공정기술의 미성숙으로 양산 라인에서의 적용은 제한적이었다. 그러나 본 논문에서는 cw Yb:YAG 레이저에 의한 열응력과 기계적 장치에 의한 응력를 동시에 이용한 풀바디 절단기술을 세계 최초로 개발하여 양산라인의 적용에 성공하였다. 이러한 하이브리드 기술로 최대절단속도는 Diamond Wheel 절단속도의 약 3배에 이르는 870㎜/s에 도달하였다.