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구정서(Koo Jung-Seo),조현직(Cho Hyun-Jik),송달호(Song Dahl Ho) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
Rotating bogie frame will be used in the bogie for the Light Rail Train being developed. In develoment of the bogie, analyzed were the structural strength and fatigue characteristics of the rotating bogie frame. Defined load cases were applied for the analysis. No part of the rotating bogie frame is subjected to stress beyond the fatigue endurance limits of the material used when grinding the weldment of the lower plate link bend. It is concluded that the rotating bogie frame is considered safe in the view of the structural strength.
정현승(Jung Hyun-Seung),권태수(Kwon Tae-soo),구정서(Koo Jeong-Seo) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Crashworthy design of a train is a systematic approach to ensure the safety of passengers and crews in railway transportation for the prescribed accident scenarios. This approach needs new structural arrangements and designs to absorb higher levels of impact energy in a controlled manner and interior designs to minimize passenger injuries. In this paper, crashworthy design approach is applied to the tilting train express (TTX) design which is newly being developed. Based on a head-on collision and a level crossing collision scenarios, the crash behaviors of a TTX design candidate are evaluated numerically using the finite element method. Finally, design alternatives which show better crashworthy performances are proposed and verified through the full-rake collision simulations.
LS-DYNA를 이용한 철도차량 연결 충돌해석에 관한 연구
정현승(Jung Hyun Seung),권태수(Kwon Tae Soo),구정서(Koo Jeong Seo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, a simple LS-DYNA shunting impact analysis model for the rolling stocks is proposed. In this model, each vehicle is represented by a 3D solid element and each coupler is represented by a 1D beam element. To describe the dynamic behavior of buffers, a nonlinear material model(MAT_GENERAL_NONLINEAR_1DOF_DISCRETE_BEAM) is used. Friction between the braked wheels and the rails is described by a Coulomb friction model. To verify the proposed LS-DYNA analysis model, a shunting impact simulation is performed and the results are compared with the previous research results.
한국형 고속틸팅차량 구동차 설계초안의 충돌압괴특성 분석
정현승(Jung Hyun-Seung),구정서(Koo Jeong-Seo),권태수(Kwon Tae-soo) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the crush characteristic of the tilting train express M-car was estimated under a head-on collision scenario. The car body was divided into three parts - front, middle, and rear. For each part, crush-force relation was evaluated numerically using LS-DYNA 3-diementional shell element analysis. This result will be used for one-dimensional collision analysis of the full train rake.
정현승(Jung Hyun-Seung),권태수(Kwon Tae-soo),구정서(Koo Jeong-Seo),조태민(Cho Tae-Min) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the crush characteristics of a tilting train express (TTX) M-car design are evaluated with a head-on collision scenario. Its body shell is divided into three parts - front end, middle section, and rear end. For each part, crush-force relation is evaluated numerically through 3-dimensional shell element analysis with LS-DYNA. TTX"s carbody structure is a hybrid type structure made of steel and composite materials. Composite sandwich panels are modeled as layered shells whose layers have different material properties. And a damage material model is used to consider the effect of stiffness degradation during deformation. The crush characteristics obtained from these calculations will be used as material modeling data of full-rake collision analyses.
단순 Box형 Cut-out 차체모델의 경량화를 위한 이론적 개념설계 모델 연구
조정길(Jeong-Gil Cho),구정서(Jeong-Seo Koo),정현승(Hyun-Seung Jung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In this paper a theoretical approach was studied to make a baseline box type model satisfying the stiffness condition of a cut-out model. First we compared the sum of the sectional theoretical deflections and the FEM result of the cut-out model under the static load test conditions and we obtained good correlations from both the results. Second To obtain the thickness of the baseline model we used the mean value of geometric moment of intertia of the side wall and roof structure. Also we compared the theoretical results and the FEM result of a baseline model and we obtained good correlations. It is considered that the developed theoretical approach can be used for the weight reduction of train carbodies.
차체의 압괴특성에 의한 충돌 후 타고오름 거동에 관한 연구
김거영(Kim Geo-young),구정서(Koo Jung-Seo),박민영(Park Min-Young) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper proposed a new 2D multibody dynamic modeling technique to analyze overriding behavior taking place during train collision. This dynamic model is composed of nonlinear spring, damper and mass by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model of rollingstock, collision energy absorption capacity, acceleration of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we choose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3D finite element analysis, and established a 2D multibody dynamic model. This 2D dynamic model was suggested to describe the collision behavior of 3D Virtual Testing Model.