http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
DFSS 기법을 적용한 알루미늄 스페이스 프레임 차체의 통합 최적설계 연구
소상우(Sang-Woo So),김민수(Min-Soo Kim),허승진(Seung-Jin Heo) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
An ASF(Aluminum Space Frame) B.I.W is optimized for reducing the weight while satisfying DFSS constraints such as static stiffness, vibration, low-and high-speed crash performances. In order to solve this multidisciplinary DFSS constraints design problem for the ASF B.I.W. Kriging model based SAO is applied.
황현태,소상우,김종도,Hwang, Hyun-Tae,So, Sang-Woo,Kim, Jong-Do 한국재료학회 2011 한국재료학회지 Vol.21 No.7
Currently, there are two main issues regarding the development of core technologies in the automotive industry: the development of environmentally friendly vehicles and securing a high level of safety in the event of an accident. As part of the efforts to address these issues, research into alternative materials and new car body manufacturing and assembly technologies is necessary, and this has been carried out mainly by the automotive industries. Large press molds for producing car body parts are made of cast iron. With the increase of automobile production and various changes of design, the press forming process of car body parts has become more difficult. In the case of large press molds, high hardness and abrasive resistance are needed. To overcome these problems, we attempted to develop a combined heat treatment process consisting of local laser heat treatment followed by plasma nitriding, and evaluated the characteristics of the proposed heat treatment method. From the results of the experiments, it has been shown that the maximum surface hardness is 864 Hv by the laser heat treatment, 953 Hv by the plasma nitriding, and 1,094 Hv by the combined heat treatment. It is anticipated that the suggested combined heat treatment can be used to evaluate the durability of press mold.
황현태 ( Hyun Tae Hwang ),소상우 ( Sang Woo So ),김종도 ( Jong Do Kim ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.4
Recently, from general machine parts and automobile parts using carbon steel to a mold, there has been efforts for improving durability and attrition resistance of these parts. Especially, heat treatment with laser which works fast and automatically can be used for the mass production with high quality. Moreover, local heat treatment can be used to handle with complex and precise parts. Accordingly, we analyzed hardening characteristics of carbon steel using the finite element method and compare the experimental results to have more reliability. We also proved the cause of thermal deformation with temperature and stress distribution by heat treatment. After these analysis and experimental, we found that each maximum hardness of the two tests was 728Hv and 700Hv, on condition of 1050℃ heating temperature, and 2mm/sec laser speed. We also found that difference of surface stress-distribution was occurred, and this makes deformation mode up after heat treatment.
고출력 다이오드 레이저를 이용한 프레스 전단금형의 경화특성
황현태 ( Hyun Tae Hwang ),소상우 ( Sang Woo So ),황재현 ( Jae Hyun Hwang ),김종도 ( Jong Do Kim ) 한국열처리공학회 2010 熱處理工學會誌 Vol.23 No.5
Recently, metal molding has become essential not only for automobile parts, but also mass production, and has greatly influenced production costs as well as the quality of products. Its surface has been treated by carburizing, nitriding and induction hardening, but these existing treatments cause considerable deformation and increase the expense of postprocessing after treatment; furthermore, these treatments cannot be easily applied to parts that requiring the hardening of only a certain section. This is because the treatment cannot heat the material homogeneously, nor can it heat all of it. Laser surface treatment was developed to overcome these disadvantages, and, when the laser beam is irradiated on the surface and laser speed is appropriate, the laser focal position is rapidly heated and the thermal energy of surface penetrates the material after irradiation, finally imbuing it with a new mechanical characteristic by the process of self-quenching. This research estimates the material characteristic after efficient and functional surface treatment using HPDL, which is more efficient than the existing CW Nd:YAG laser heat source.
21700 원통형 배터리 모듈 팬 강제냉각에 관한 열유동해석 연구
이우원(Woowon lee),정용하(Yong-Ha Jeong),소상우(Sang Woo So),황현태(Hyun-Tae Hwang),강민정(Minjeong Kang),이재찬(Jaechan Lee) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.4
리튬이온 배터리의 효율 증가 및 안전성을 높이기 위하여 발열에 대한 관리가 요구된다. 또 효율적이지 못한 열관리 때문에 배터리의 노화로 인한 용량의 변화를 발생시킬 수 있다. 본 논문에서는 21700 원통형 리튬이온 배터리의 충/방전 시 발생하는 과열을 방지하기 위하여 팬을 사용하여 배터리를 강제 냉각시키는 것에 대해 열유동해석을 수행하였다.