• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.318-321
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• 2005

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, an evaluation method for crashworthiness of Korean tilting train express is introduced. Crush characteristics for each part of tilting train express are evaluated numerically through 3-dimensional shell element analysis with LS-DYNA. Based on a head-on collision and a level crossing collision scenarios, the crash behaviors of tilting train express are evaluated numerically using full-rake collision simulations.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1185_1186
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• 2009

철도신호시스템은 열차들의 운행간격과 열차진로를 제어하는 기능을 담당함으로써 열차를 안전하고 효율적으로 운영하는 데 있어 핵심적인 역할을 수행한다. 철도신호시스템의 고장은 열차운행중지를 비롯하여 열차충돌이나 탈선등과 같은 치명적인 사고로 직결될 수 있기 때문에 시스템의 신뢰성과 안전성이 매우 중요하다. 현재까지 철도신호시스템에서는 지존의 지상신호방식이 많이 사용되어 왔으나 지상에 설치된 신호기 현시상태를 기관사가 확인하여 열차속도를 제어함으로써 기관사의 인적 오류 등의 사고 위험이 있다. 아울러 시스템의 수명이 다 되어 시스템절체의 필요성이 있다. 이에 따라 최근에는 컴퓨터 및 통신기술을 이용하여 열차속도제어 정보를 차상으로 송신하고, 차량에서 열차속도를 제어하는 차상신호방식이 도입 적용 되어 효과를 보고 있다. 따라서 수명이 다된 신호시스템을 교체하기 위하여 승객을 위한 운행서비스를 하면서 새로운 방식으로 절체 하는 것이 필요하다. 이에 본 논문에서는 시스템 절체과정의 절차와 시스템검증을 위한 일련의 과정중 간섭의 문제점을 시험평가를 통해 확인하였다.

• Journal of the Korean Society for Railway
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• v.14 no.3
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• pp.203-210
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• 2011

This study formulates the theoretical wheel-set model to evaluate wheel-climbing derailments of rolling stock due to collision, and verifies this theory with dynamic simulations. The impact forces occurring during collision are transmitted from a car body to axles through suspensions. As a result of combinations of horizontal and vertical forces applied to axles, rolling stock may lead to derailment. The derailment type will depend on the combinations of the horizontal and vertical forces, flange angle and friction coefficient. According to collision conditions, the wheel-lift, wheel-climbing or roll-over derailments can occur between wheel and rail. In this theoretical derailment model of wheelset, the wheel-climbing derailment types are classified into Climb-over, Climb/roll-over, and pure Roll-over according to derailment mechanism between wheel and rail, and we proposed the theoretical conditions to generate each derailment mechanism. The theoretical wheel-set model was verified by dynamic simulations.

• Journal of Korean Society of Transportation
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• v.24 no.4 s.90
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• pp.93-101
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• 2006

The signalized intersections near highway-railroad grade crossing are operated without signal preemption in Korea when trains are approaching the crossing. This signal operation is very dangerous because queues from the intersection can extend back over the track, thereby creating the Potential for a serious vehicle-train accident. And the queues from the crossing can extend to the intersection with the normal signal operation while trains Pass the crossing. In this case the intersection is disrupted, and delay and the Potential for vehicle accident increase highly In order to improve the intersection performance and Protect the accident the crossings and intersections. signal Preemption designed to provide a special control mode should be implemented. In this study it was shown that intersection Performance near highway-railroad grade crossing improved using signal preemption. When signal Preemption is implemented at the test site, the delay was reduced by about 9sec/veh. Even though there were vehicle-train accidents at the crossing in all 30 simulations without signal preemption. there was no vehicle-train accidents at all when signal preemption is used.

• 기계와재료
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• v.9 no.2 s.32
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• pp.176-185
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• 1997

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.322-325
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• 2005

TTX(Tilting Train eXpress) is being designed for improving the speed of conventional railway. The purpose of this study is to evaluate energy absorbing capacity and driver's survivability for a design candidate of the front end structure of TTX. A FE model with honeycomb block, under frame, and body frame is generated for crash simulation. Based on a level-crossing accident scenario, numerical simulation is performed using LS-DYNA. The results of crash analysis show that strength improvement of the current front end structure design candidate is needed to ensure driver safety.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.443-445
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• 1999

본 연구에서는 고도의 전문가 수준에서 역구내 상황을 고려하여 실시간 전자연동처리전략을 수립함으로써 열차운행을 안전하고 정확하게 제어 열차충돌이나 탈선 등의 사고를 사전에 방지함으로써 보다 높은 안전도가 보장될 수 있도록 지원하는 전문가 시스템이 제안된다. 전문가 시스템은 열차의 역구내 운행시 신호기, 전철기 궤도회로 등의 입력정보로부터 연동 지식베이스에 근거하여 신호설비들간의 연쇄관계를 확인, 실시간 연동전략을 수립하며, 연동규칙을 정확하고 효과적으로 표시할 수 있도록 규칙기반 시스템으로 구현된다. 특히, 제어실패시 논리적 추론기능과 협조하여 합리적인 진로를 제시함으로써 비상시 역무원이 당황하지 않고 신속하고 안전하게 연동업무를 처리할 수 있도록 한다.

• Computational Structural Engineering
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• v.29 no.1
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• pp.40-45
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• 2016

• Journal of the Korean Society for Railway
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• v.5 no.3
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• pp.187-195
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• 2002

It is important to predict the crash behavior of trains to improve their crashworthiness. This paper investigates the simulation of high-speed train crashes in three dimensions using multibody dynamics. At present, little is known about three-dimensional crash simulations. This study shows that it is possible to simulate overriding and lateral buckling, including results from one- or two-dimensional simulations. Several parameters, however, such as computational time and large deformation of structures, need further investigation.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.1
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• pp.160-166
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• 2010

Railroad level crossing systems are used to prevent train from collisions by informing pedestrians and vehicles of approaching trains on the level crossing. The current detection systems mostly use track-based electrical circuits to detect approaching trains. The making and breaking of the circuit when the train wheel passes along the track sends a signal to barriers that restrict access to the track. Unfortunately, this track-based signal system is vulnerable to malfunctions in certain situations. If the rail becomes rusted due to moisture, weather conditions, or infrequent use, the electrical circuit detection system could fail. Such a failure could lead to a train-vehicle or train-pedestrian collision. This paper suggests a replacement of the electrical circuit-based system with an infrared detection system. The research shows that an infrared detection system improves safety by reducing the frequency of detection failure of the alarming circuit to system.