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최원목(Choi Won-Mok),정현승(Jung Hyun-Sung),권태수(Kwon Tae-su) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
There are normally two types of the energy absorbers used in the crashworthiness of trains. The first is a structure type, which mainly used in not only the primary structures of the train but also the crash energy absorbers at the accident. The second is a module type, which just absorbs the crash energy independent of the primary structures and attached to the structures of the train. The expansion and inversion tube are widely used as the module type crash energy absorbers, especially in the train. The tubes should not be buckled under the load acting on the end of the tube in longitudinal direction during absorbing the crash energy. The buckling stability of the tubes is affected by the boundary conditions, thickness and length of tube. In this study, the effects of the length and thickness of the tubes on the buckling load are studied by using the ABAQUS, a commercial finite element analysis program, and then presents the guideline to design the tube. The analysis processes to compute the buckling load consist of a linear buckling analysis and a nonlinear post-buckling analysis. The buckling modes are evaluated by the linear buckling analysis, as using these modes, the buckling loads are computed by the nonlinear post-buckling analysis.
FEM을 이용한 확관형 충돌에너지 흡수부재의 좌굴불안전성에 관한 연구
최원목(Won-Mok choi),정현승(Hyun-Sung Jung),권태수(Tae-Su Kwon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The crash energy absorbers used in the trains normally are classified into two types. The first is the structure type, which mainly used in not only the primary structure of train but also the crash energy absorbers at the critical accidents. The second is the module type, which just absorbs the crash energy independently and attached onto the structures of the trains. The expansion tube is widely used as the module type of the crash energy absorbers, especially in the trains that have a heavy mass. Since the crash energy is absorbed by means of expanding the tube in the radial direction, the features of the expansion tube have the uniform load during the compression. As the uniform load remains in sudden impact, the expansion tube is effective to decrease acceleration of passengers when the train accident occur. The buckling instability of the expansion tubes is affected by the boundary conditions, thickness and length of tube. In this study, the effects of the length and thickness of the expansion tubes under the arbitrary load on the buckling are studied using the ABAQUS/standard and ABAQUS/explicit, a commercial finite element analysis program, and then presents the guideline to design the expansion tubes. The analysis processes to compute the buckling load consist of the linear buckling analysis and the nonlinear post-buckling analysis. To analysis the nonlinear post-buckling analysis, the geometry imperfections are introduced by applying the linear buckling modes to nonlinear post-buckling analysis.
신상민(SangMin Shin),권태수(TaeSoo Kwon),정현승(JungHyun Seung),김진성(JinSung Kim),최원목(Won-Mok Choi) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper concerns an obstacle deflector for a front car of a train. Obstacle deflectors are intended to deflect small to medium sized items of debris from track to reduce the risk of derailment. Associated standards for design requirements of obstacle deflector are provided in EN15227, Railtrack Gruop Standard GM/RT2100 and Korean Railway Safety ACT. Based on these standards, this paper discusses some of the operational and functionality issues with the design of energy absorbing device and shape of obstacle deflector.
손승완(Seung-Wan Son),정현승(Hyun-Seung Jung),김진성(Jin-Sung Kim),최원목(Won-Mok Choi),권태수(Tae-Soo Kwon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The light collision safety device is normally installed behind a coupler and its main function is absorbing kinetic energy to protect from passenger's serious injury. The purpose of this study is reducing over 30% of tube weight while the energy absorption capacity remains same. The light weight design of the expansion tube type light collision safety device by using high strength steel was performed using commercial FE(Finite Element) code(ABAQUS/Explicit). Consequently, the 41 % weight reduction of expansion tube was achieved by using ATOS80(High Strength Steel) than conventional expansion tube.
김상영 ( Sang-young Kim ),금동엽 ( Dong Yeop Keum ),김형은 ( Hyoung Eun Kim ),김대진 ( Dae Jin Kim ),김준호 ( Jun Ho Kim ),홍성경 ( Seong Kyeong Hong ),최원목 ( Won Mok Choi ),석창성 ( Chang Sung Seok ) 한국안전학회(구 한국산업안전학회) 2017 한국안전학회지 Vol.32 No.1
In this study, a simplified FE model for evaluating seismic performance of valve support was suggested and an apparatus for a real structure testing was developed. The seismic performances of three different types of valve supports were evaluated by the real structure testing. By comparing the results between the real structure testing and FEA using the simplified FE model, it was verified that the suggested simplified FE model can be utilized for comparative evaluation of seismic performance of valve supports.