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CRASHWORTHY DESIGN AND EVALUATION ON THE FRONT-END STRUCTURE OF KOREAN HIGH SPEED TRAIN
구정서,윤영한 한국자동차공학회 2004 International journal of automotive technology Vol.5 No.3
An intensive study was conducted for the crashworthy structural design of the recently developed KoreanHigh Speed Train (KHST). Two main design concepts were set up to protect both crews and passengers from seriousinjury in heavy collision accidents, and to reduce damage to the train itself in light collision accidents. A collision againsta movable 15-ton rigid obstacle at 110 kph was selected from train accident investigations as the accident scenario for theheavy collisions. A train-to-train collision at the relative velocity of 16 kph was used for the light collision. Thecrashworthiness behaviors of KHST were numerically evaluated using FEM. Analysis results using 1-D collisiondynamics model of the full rake consist and 3-D shell element model of the front end structure showed good crashworthyresponses in a viewpoint of structural design. Occupant analyses and sled tests demonstrated that KHST performed wellenough to protect occupants under the considered accident scenarios. Finally our numerical approaches were evaluated bya real scale collision test.
구정서,송달호,Koo, Jeong-Seo,Song, Dahl-Ho 한국철도학회 1998 한국철도학회논문집 Vol.1 No.1
Described in this paper is the result of a study on collision analysis of TGV-K using 1-dimensional model for crashworthy design. Crashworthy design of the front end is very important because majority of the impact energy (more than 70%) is absorbed by the crush of the front end when the train is collided with an obstacle like a tank lorry. Guideline for the crashworthy design can be described from the collision analysis of the whole train using a 1-dimensional model. Since the headstock of TGV-K is not designed in a crashworthy point of view, a conceptual design of the headstock to improve crashworthiness is suggested and evaluated using 1-dimensional collision analysis. The suggested design, which adopts an energy absorber and a crashworthy headstock, shows a good behaviour on the accident scenario of SNCF (collision at 110 km/h against a movable rigid mass of 15 ton).
구정서,김동성,조현직,권태수,최성규 한국철도학회 2000 한국철도학회논문집 Vol.3 No.1
In this paper, numerically evaluated is the crashworthiness of the new design of the standard Korea Electric Multiple Unit Train(K-EMU)[developed by the Korea Railway Research Institute]. The 4-car consist of K-EMU is analyzed under collision conditions such as normal coupling, heavy shunting, light collision and heavy collision to collide against another stationary one at 5 kph, 10 kph, 25 kph and 32 kph, respectively. Energy absorbing capacity of its draftgear commercially available in the market and to be equipped in K-EMU is evaluated under each collision condition. Analytical results show that draftgear only is not enough to provide necessary energy absorbing capacity. It is therefore concluded that additional energy absorbers like mechanical fuses should be adopted to improve the crashworthiness of K-EMU.
구정서 한국전산구조공학회 2004 한국전산구조공학회논문집 Vol.17 No.2
본 연구에서는 기존의 철도차량구조에 경량소재를 적용하여 설계를 검토할 때, 각 소재의 성질이 차체구조의 경량화에 미치는 영향과 그 정도를 정량적으로 분석하여 개념설계단계에서 소재대체 설계 효과를 예측하는 방법을 개발한다. 전체 차체구조에 대해서는 굽힘변형, 압축변형, 비틀림 변형을 고려하여 소재를 변경할 때, 또 주요 골조 구조 부재에 대해서는 굽힘변형, 압축변형, 좌굴붕괴를 고려하여 소재와 단면형상을 변경할 때 경량화 특성을 분석할 수 있는 방법을 체계화였다. 차체구조 또는 골조부재의 변형 양상에 대한 강성 및 강도 조건을 경량화 지수와 연계하여 표현함으로써 각 재료와 부재의 형상이 가지는 기계적 특성과 장단점을 용이하게 분석할 수 있도록 하였다. This paper developed the theoretical method to predict structural performances and weight reduction rates of a carbody when its materials should be substituted. For the material substitution design of the carbody, the bending, axial and twisting deformations are evaluated under the constant stiffness and strength conditions. For the design of the primary structures such as the center beams, the cross beams and the cantrails, the bending and axial deformations are investigated under the condition of the constant bending stiffness, the constant bending or buckling strength by considering both the material properties and the cross sectional shapes. The developed indices to measure the weight reduction by the material substitution give good informations on the weak and strong points of a carbody design.
1차원 동역학 모델을 이용한 한국형 고속전철의 충돌 안전도 평가
구정서,조현직,김동성,윤영한 한국철도학회 2001 한국철도학회논문집 Vol.4 No.3
One of the best methods to evaluate crashworthiness of a full rake trainset is to analyse 1-dimensional dynamic model using dampers, nonlinear springs and bars, and masses. In this study, the crashworthiness of KHST has been evaluated by analysing a nonlinear dynamic model made up of springs/bars-dampers-masses. The numerical results show that the KHST can absorb more kinetic energy at lower impact forces and lower accelerations in case of heavy collisions, if compared with KTX. Also, the KHST can be protected from any damage in its car-body and electric components except the energy absorbing tube in case of light collisions, like train-to-train accidents at speed under 8 kph. On the other hand, the KTX may be more damaged in the light collisions because there is no energy absorbing tube.
A new derailment coefficient considering dynamic and geometrical effects of a single wheelset
구정서,오현석 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
A new derailment coefficient of a single wheelset was theoretically developed by considering the dynamic and geometric effects fromlateral acceleration and gyro factors as well as mechanical factors like flange angle, frictional coefficient, wheel-unloading, wheel radius,track gauge and position of axle bearings. This new derailment coefficient (lateral force over vertical wheel load, P/Q) can predict thecommencement of various derailments, such as wheel climbing and lifting types, roll-over types and their combined types. In addition,this derailment coefficient can analyze the various dynamic and geometrical effects of a wheelset, which are not considered in the conventionalderailment coefficients of Nadal’s and Weinstock’s formulas. This derailment coefficient was verified by comparing its theoreticalanticipations of several examples with numerical simulation results using a commercial dynamic S/W, RecurDyn.