• Title/Summary/Keyword: Train

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Evaluation of Train Capacity Pattern Considering Customer Demands (고객수요를 고려한 열차용량패턴에 관한 연구)

  • Kim Dong-Hee;Kim Seong-Ho;Hong Sun-Heum
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.507-513
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    • 2004
  • In the railway system, transportation plan corresponds to a m aster plan for transport services. This service plan must be constructed to minimize operational cost or maximize revenue considering transportation demands and resource capacities in the railway operation company, and it includes several sub-planning activities such as train operation frequency plan, train (schedule) plan, train capacity assignment plan, and rolling stock requirement plan. In these sub- planning processes, train can be con side red as a product for providing customer services, and customer demands and operational advantages must be considered. In this paper, we present an effect estimation system for the train capacity pattern in a train schedule, and the effect of capacity pattern can be expressed as minimum spilled demand, minimum train service cost, and maximum train revenue or profit.

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Analysis to distance and train speed of portable alarm system using GPS and RF mode (휴대용 열차접근경보장치에 적용되는 GPS모드와 RF모드의 거리 및 속도 분석)

  • Kwon Ki Jin;Ohn Jung-Ghun;Shim Jae-bock;Choi Yung ha
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.1471-1473
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    • 2004
  • A portable train approaching warning device can be used in order to reduce accidents of the workers on the rail, who are working without recognizing the approaching train, and to secure the safety of the workers. It can be installed in the train so that workers can recognize the approaching train. However, it is not easy to identify the location of the train precisely. In this study GPS and RF devices, which are used to calculate the location of the train were reviewed, to see how much error tolerance they have in the field, to analyze the distance for normal transmission between the receiver and transmitter, to verify the conformity of the portable train approaching warning device developed as a prototype model to the current rail system, and to provide the related fields with the analysis results to improve the existing or application technology. Additionally, test methods to locate the train were introduced and each test result was compared and analyzed.

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Study of a New Technique for the Train Tracking System (새로운 열차위치검지 기법 연구)

  • Jeong Rag-Gyo;Cho Hong-Shik;Chung Sang-Gi;Kim Young-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.1
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    • pp.9-16
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    • 2005
  • Accurate and reliable tracking of train is essential for the train control system. The fixed block system which utilizes track circuit has been used widely for the detection of train position. As an alternative, the moving block system has the advantage over the fixed block system since it enables shorter headway and easier maintenance. This paper presents a new technique for the train tracking system which uses radio signal for the train position detection. The proposed algorithm uses the phase difference of arrival of radio signal for the detection of train position. Experimental verification of the algorithm is presented in the paper.

Analysis on the Train-wind Pressure applied to Screen Door in Island-type Platform of Subway (지하철의 섬식 정거장에 설치된 스크린도어에 가해지는 열차풍압 해석)

  • Kim, Jung-Yup
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.138-141
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    • 2008
  • The screen doors installed in the station of subway are subject to the train-wind pressure caused by the operation of trains. The train-wind pressure has to be correctly estimated for the design of safe structure of screen doors. As three-dimensional numerical flow analysis technology has been significantly developed, the analysis on the train-wind pressure with diverse variables such as train specifications, train speed, tunnel and station configurations, and blockage ratio can be effectively carried out with three-dimensional numerical method. In this study, computational analysis of train-induced wind in a subway tunnel employing the screen doors are carried out by using the three-dimensional numerical method with the model of the moving boundary for the run of trains. While the numerical analysis of train-wind pressure was applied on the one island-type station in the Seoul Subway Line 2, maximum pressure of 494 Pa was estimated on the screen door when two trains pass each other at the speed of 80km/h in the platform.

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2D Modeling and Brake System Simulation of a Train (철도차량 2D 모델링 및 제동시스템 시뮬레이션)

  • Kang, Chul-Goo;Kim, Ho-Yeon;Goo, Byeong-Choon
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.811-816
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    • 2008
  • Train dynamics affects significantly safe and efficient operation of a train, especially during traction or braking period. Train dynamics is intrinsically complex due to many DOF motions in a three-dimensional space, and its behavior during the braking stage is too complex to understand and design an effective braking logic of the train. In this paper, we present a two-dimensional model with three DOF motion in a longitudinal, vertical, and pitch direction for the Hanvit 200 tilting train, which is efficient to analyze a braking performance. Furthermore, we analyze the braking logic and simulate the braking process of the Hanvit 200 tilting train using Simulink.

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A Numerical Study on the Compression Wave Generated by the Train Entering a Tunnel - Effects of the Start Method of a Train - (열차가 터널에 진입할 때 발생하는 압축파에 대한 수치해석 -열차의 출발방법에 따른 영향에 대한 고찰 -)

  • Kim, Sa-Ryang
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.12
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    • pp.1039-1046
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    • 2006
  • The numerical simulations on the train entering a tunnel are performed by solving unsteady axi-symmetric problems. To reduce the effects of the pressure wave generated by the train starting abruptly, several starting methods of the train are examined. The high order velocity increase gives better results than those for the linear velocity increase. The high order velocity increase gives good results for the pressure rise by the train entering a tunnel, too. The distance to the train reaches the highest running velocity from the start should be more than 60 m when the train speed is 350 km/h.

On the Design of Radio System for Communication Based Train Control System(2) (무선통신기반 열차제어시스템의 무선시스템 설계에 대한 검토(2))

  • Choi Kyu-Hyoung;Yoon Yong-Gi
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1297-1302
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    • 2004
  • CBTC(Communication Based Train Control) System has many superior train control performances than conventional track-circuit-based train control system with higher train operation efficiency, and less installation and maintenance cost. It is expected that CBTC will replace the conventional train control systems in near future. As CBTC has different mechanisms from conventional track-circuit-based train control systems in identifying train positions, and communicating information between train and ground facility, we have to pay a earful attention to making the interface between CBTC equipments and other signalling devices. This paper provides the construction of the interface between CBTC equipment and other signalling equipments such as TTC(Total traffic Control) system. ATO. electronic interlocking devices.

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Effect of Train Nose Shape on the High-Speed railway Tunnel Entry Compression Wave (고속열차의 선두부 형상이 터널 입구압력파에 미치는 영향)

  • 김희동;김태호;서태원
    • Proceedings of the KSR Conference
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    • 1998.05a
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    • pp.596-603
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    • 1998
  • The entry compression wave, which is generated at the entrance of the tunnel, is almost always associated with the pressure transients in the tunnel as well as the impulse noise at the exit of the tunnel. It is highly required to design the train nose shape that can minimize such undesirable phenomena. The objective of the current work is to investigate the effects of the train nose shape on the entry compression wave. Numerical computations were applied to one-dimensional unsteady compressible flow in high-speed railway train/tunnel systems. A various shape of train noses were tested for a wide range of train speeds. The results showed that the strength of the entry compression wave is not influenced by the train nose shape, but the time variation of pressure in the entry compression wavefront is strongly related to the train nose shape. The current method of the characteristics was able to represent a desirable nose shape for various train speeds. Optimum nose shape was found to considerably reduce the maximum pressure gradient of the entry compression wave.

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Train Operation Control by Radio Based Communication (무선 통신을 이용한 열차운행 제어 방식에 대한 연구)

  • Lim jae-sik;Kim chi-jo;Kang man-sik
    • Proceedings of the KSR Conference
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    • 2003.10c
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    • pp.216-222
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    • 2003
  • Train control by radio based communication is one of the interesting new fields in train signal. The radio based control has more benefits, low headway and low construction and maintenance cost, than conventional control. In this paper, a safe and efficient train operation is introduced. Triple radio communications, train to train, train to station, and train to central traffic control, are used to increase the reliability. One of these communications channels has a fault; the others can take the functions of it. Absolute position of a train is transmitted to station via radio communication. In the station, the interlocking mechanism should be activated as the legacy.

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Research for possible Service Interval of High Speed KTX train in conventional KyoungBu-Line (기존 경부선 구간의 고속열차 운행가능시격에 대한 연구)

  • Lee, Chang-Mu;Kim, Joo-Rak;Lee, Han-Min;Oh, Se-Chan;Kim, Gil-Dong
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.1461-1467
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    • 2006
  • In case of accidents at the line of Seoul-Pusan high speed railway, high speed train should be operated with making a detour by using existing Seoul-Pusan railroad. For Dae-jeon$\sim$Dae-Gu section which has fragile structures, following points are investigated. In operating existing train, train running time is analyzed by the case of only high speed train being in service and the case of high speed train being in service on condition that existing train is operated. Also the possibility about operation on present train headway and train headway that is applicable to operation and vocational problems would be examined.

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