http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
2차원 다물체 동역학을 이용한 열차의 타고오름 해석 연구
김거영(Geoyoung Kim),구정서(Jeongseo Koo),이장욱(Jang Wook Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
With improvement of the computer simulation technique for crashworthiness, passive safety of vehicles has been much enhanced. Intrinsically train collision accident is more complicate and dangerous than automobile crash one. The overriding phenomena occurring in train collision often result in many casualties. In this paper, in order to evaluate overriding behavior at train collision, 2-dimensional multi dynamic model is developed using the explicit nonlinear dynamic finite element code of LS-Dyna. This modelling technique will help designers to determine the specifications of anti-climbing devices. In addition, it is evaluated that the height of center of gravity of vehicle effects on overriding displacement.
Filament winding 공법 GFRP 원형튜브의 에너지 흡수특성에 관한 연구
김거영(Geoyoung Kim),구정서(Jeongseo Koo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, quasi-static crushing tests of circular tubes under axial compression load are conducted to investigate the energy absorption characteristics. Circular tubes used for this experiment are glass/epoxy(GFRP) composite tubes, which is fabricated by the filament winding method. One edge of the composite tubes is chamfered to reduce the initial peak load and to prevent catastrophic failure in collapse situations. Two suggested trigger mechanisms for the composite tubes are investigated. Crushing modes are mainly affected by thickness/diameter ratio and average crushing loads are mainly affected by their cross-sections. Energy absorption characteristics vary significantly as a function of the tube geometry, trigger mechanism, t/D ratio and cross-sectional shape.
열차의 1차원 충돌 동역학 모델과의 비교를 통한 2차원 모델의 검증
김거영(Geoyoung Kim),구정서(Jeongseo Koo),정현승(Hyunseng Jung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Through this study, 2D multibody dynamics models for analysis of train collisions have been verified by the comparison of the 1D dynamic model of the KHST(Korean High Speed Train). The main crushable sections of 2D dynamic model are composed of two nonlinear spring made out of crush characteristic of 3D KHST. 2D model can evaluate overriding phenomena, impact force of spring coupled by bogie in train collision. In order to compare of 1D dynamic model, Two dynamic models are made out of same crush characteristic and length in a same section. also 2D model constraints displacements of gravity direction. The collision accident scenarios is a train-to-train collision at the relative speed of 36 kph in the crashworthiness regulation. It is shown from the simulation results that the analysis results of 2D model is similar with the 1D model.
차세대 분산형 고속열차와 15톤 변형체 장애물과의 충돌시뮬레이션에 관한 연구
김거영(Geoyoung Kim),구정서(Jeongseo Koo),송달호(Dahlho Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this article, train collision against a standard deformable obstacle was simulated. It is natural that the impact acceleration of the front end car should be controlled under the appropriate level(max. 7.5g, average 5g), as stipulated at the domestic and TSI safety regulations for collision accidents. The complete train set will be composed of 2TC-6M with 13 ton axle load. For the deformable obstacle collision, we used the 3-dimensional finite element model of front structure and 1-dimensional dynamic model of all other structures, because the obstacle collision highly affects at front structure of car. The 15-ton standard deformable obstacle of the domestic and TSI regulations was developed and demonstrated for 3-dimensional collision. It was shown from the simulation results that the suggested design can satisfy crashworthiness requirements of the domestic regulation and TSI.
동력집중식 고속열차의 충돌안전도 표준설계가이드라인에 관한 연구
김거영(Geoyoung Kim),조현직(Hyunjik Cho),구정서(Jeongseo Koo),권태수(Taesoo Kwon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper studied on the standard design guidelines of high speed train with power car to meet the crashworthiness requirements of the Korean rollingstock safety regulation. The regulation calls for some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 kph, and a collision against a standard deformable obstacle of 15 ton at 110 kph. A standard train consist was chosen as 2PC-2ET-6T with 17ton axle load. similar to KTX-2 for the Honam express line. Using theoretical and numerical analyses, some crashworthy design guidelines were derived in terms of mean crush force and energy absorption for principal crushable components. The derived design guidelines were evaluated using one dimensional spring-mass dynamic simulation. It is shown from the simulation results that the suggested design guidelines can satisfy the domestic crashworthiness requirements easily.