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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.
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.
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.
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.
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.
도시철도차량 차체의 경량화를 위한 소재 변경 및 구조체 최적화 연구
조정길(Jeong Gil Cho),구정서(Jeong Seo Koo),정현승(Hyun Seung Jung) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.9
본 연구에서는 알루미늄 압출재로 구성된 한국형 표준전동차모델(K-EMU)의 차체를 대상으로 치수 최적설계와 구조체 소재 변경을 통한 경량화방안에 대해 연구하였다. 우선 K-EMU 차체의 하부구조, 측벽구조, 단부구조의 부재별 두께를 현재의 압출가능 두께를 적용하여 치수 최적화 기법으로 약 14.8% 경량화 하였다. 그리고 치수최적설계 된 K-EMU 차체에 유지보수성이 좋은 고장력강(SMA570)재질의 프레임타입 하부구조를 적용하여 초기 K-EMU 차체대비 약 3.8% 경량화 된 하이브리드 차체를 도출하였다. 마지막으로 샌드위치 복합재를 하부구조와 지붕구조에 적용하여 초기 K-EMU 차체대비 약 30% 경량화 된 초경량 하이브리드 차체를 도출하였다. 도출된 차체 모델들은 모두 전동차 구조체 하중시험법을 만족하였다. This study proposes a weight reduction design for urban transit, specifically, a Korean EMU carbody made of aluminum extrusion profiles, according to size optimization and useful material changes. First, the thickness of the under-frame, side-panels, and end-panels were optimized by the size optimization process, and then, the weight of the Korean EMU carbody could be reduced to approximately 14.8%. Second, the under-frame of the optimized carbody was substituted with a frame-type structure made of SMA 570, and then, the weight of the hybrid-type carbody was 3.8% lighter than that of the initial K-EMU. Finally, the under-frame and the roof-panel were substituted with a composite material sandwich to obtain an ultralight hybrid-type carbody. The weight of the ultralight hybrid-type carbody was 30% lighter than that of the initial K-EMU. All the resulting carbody models satisfied the design regulations of the domestic Performance Test Standard for Electrical Multiple Unit.