• Title, Summary, Keyword: High-speed trains

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Effect of the Introduction of High-speed Trains on Consumer Welfare

  • BAEK, JISUN
    • KDI Journal of Economic Policy
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    • v.38 no.1
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    • pp.23-52
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    • 2016
  • This paper examines the impact of introducing high-speed trains on consumer welfare, taking the ensuing changes in train schedules into account. Based on the estimated demand model for travel which incorporates consumer's heterogeneous preferences for travel schedules into the standard discrete-choice model, I separately evaluate the impact from adding high-speed trains and that from changes in train schedules. The results indicate that consumers who travel between two cities connected by high-speed trains benefit from the introduction of high-speed trains, while some travelers whose choice set does not include high-speed trains face a reduced frequency of non-high-speed trains, resulting in significant losses.

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A Study on Appropriate Driving Speed for High-Speed Trains Running the Conventional Line (기존선을 통과하는 고속차량의 적절한 주행속도에 관한 연구)

  • Ham, Young Sam
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.9
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    • pp.773-776
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    • 2014
  • KTX (Korea Train eXpress) is the first high-speed train operated in Korea and its highest speed reaches 300 km/h. Korean high-speed trains are mostly operated on the railroads exclusively designed for high-speed trains, but the sections of Seoul~Gwangmyeong, nearby of Daejeon station and Dongdaegu are operated on the existing tracks having the speed less than 150 km/h. With this paper, we'd like to analyze the lateral force that occurs between the wheels and the rail when high-speed trains were operated on the existing track section to suggest an appropriate driving speed for high-speed trains. As the rigid wheel base of the high-speed train is 3m which is about 50% longer than normal vehicles, it works as an advantage for high-speed driving. However, as the lateral force becomes higher than normal vehicles when driving on curves, plans to reduce wear-outs on the wheels are required.

A Proposal on Calculation Model to Predict Environmental Noise Prediction Emitted by High Speed Trains (고속철도 환경소음예측을 위한 계산 모델 제안)

  • Cho, Dae-Seung;Cho, Jun-Ho;Kim, Jin-Hyeong;Jang, Kang-Seok;Yoon, Jae-Won
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.843-848
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    • 2011
  • Planning and construction of railway for high speed trains up to 400 km/h are recently driven in Korea. High speed train is one of the environment-friendly fastest mass transportation means but its noise generated by rolling, traction and aerodynamic mechanism can cause public complaints of residents nearby railways. To cost-effectively prevent the troublesome noise in a railway planning stage, the rational railway noise prediction method considering the characteristics of trains as well as railway structures should be required but it is difficult to find authentic methods for Korean high speed trains such as KTX and KTX-II. In this study, we propose a framework of our own railway noise prediction model emitted by Korean high speed trains over 250 km/h based on the recent research results carried out in EU countries. The model considers railway sound power level using several point sources distributed in heights as well as tracks, whose detail speed- and frequency-dependent emission characteristics of Korean high speed trains should be determined in near future by measurement or numerical analysis. The attenuation during propagation outdoors is calculated by the well-known ISO 9613-2 and auxiliary methods to consider undulated terrain and wind effect.

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Configuration design of the trainset of a high-speed train using neural networks

  • Lee, Jangyong;Soonhung Han
    • Proceedings of the Korea Inteligent Information System Society Conference
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    • pp.116-121
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    • 2001
  • Prediction of the top(service) speeds of high-speed trains and configuration design to trainset of them has been studied using the neural network system The traction system. The traction system of high-speed trains is composed of transformers, motor blocks, and traction motors of which locations and number in the trainset formation should be determine in the early stage of train conceptural design. Components of the traction system are the heaviest parts in a train so that it gives strong influence to the top speeds of high-speed trains. Prediction of the top speeds has been performed mainly with data associated with the traction system based on the frequently used neural network system-backpropagation. The neural network has been trained with the data of the high-speed trains such as TGV, ICE, and Shinkanse. Configuration design of the trainset determines the number of trains motor cars, traction motors, weights and power of trains. Configuration results from the neural network are more accurate if neural networks is trained with data of the same type of trains will be designed.

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Analysis of Aerodynamic Noise in High Speed Trains

  • Kim, Tae-Min;Kim, Jung-Soo
    • International Journal of Railway
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    • v.4 no.3
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    • pp.70-73
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    • 2011
  • Controlling the exterior and interior noise emission has become an important issue in the research and development of high speed trains. As the operating speed of the train increases, the noise emission characteristics are expected to deviate from that of the existing trains due to several changes in the basic train layout. For train speed in excess of 350 km/h in particular, the aerodynamic noise component starts to exceed the structure-borne noise component, and even an incremental speed increase is accompanied by a rapid elevation in the noise level. The present study presents an engineering approach for predicting the aerodynamic noise level at the design stage for high speed trains. The experimental noise measurements from test run of Korean high speed train under development are presented as a partial validation of the proposed approach. While the overall aerodynamic noise can be cast in a single power law relationship against the train speed, different parts of the train show power law relationships unique to each component.

Overview and Implication of Technical Trend of New High-speed Train in the World (세계 고속열차 기술개발 동향과 시사점)

  • Park, Choon-Soo;Kim, Ki-Whan;Kim, Sang-Soo
    • Proceedings of the KSR Conference
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    • pp.862-867
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    • 2008
  • High-speed railway is important transportation in the world because it is very comfortable, environmental benefits, energy savings, etc. The increase of demand for high-speed railway influence to develop of new hish-speed trains. Many countries introduced new high-speed train in the market. It meets to the market's needs. They adopt new technology and systems like that active suspension, synchronous permanent magnetic motor, distributed drive system, aero acoustics, etc. In Korea, the project for R&D of new high-speed train is launched last year. We need analysis of technical trend of new high-speed trains in the world. This paper presents a overview of technical trend of new high speed trains and what is key issues in development of high-speed train. It is very useful to develop a next generation high-speed train in Korea.

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Structural health monitoring-based dynamic behavior evaluation of a long-span high-speed railway bridge

  • Mei, D.P.
    • Smart Structures and Systems
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    • v.20 no.2
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    • pp.197-205
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    • 2017
  • The dynamic performance of railway bridges under high-speed trains draws the attention of bridge engineers. The vibration issue for long-span bridges under high-speed trains is still not well understood due to lack of validations through structural health monitoring (SHM) data. This paper investigates the correlation between bridge acceleration and train speed based on structural dynamics theory and SHM system from three foci. Firstly, the calculated formula of acceleration response under a series of moving load is deduced for the situation that train length is near the length of the bridge span, the correlation between train speed and acceleration amplitude is analyzed. Secondly, the correlation scatterplots of the speed-acceleration is presented and discussed based on the transverse and vertical acceleration response data of Dashengguan Yangtze River Bridge SHM system. Thirdly, the warning indexes of the bridge performance for correlation scatterplots of speed-acceleration are established. The main conclusions are: (1) The resonance between trains and the bridge is unlikely to happen for long-span bridge, but a multimodal correlation curve between train speed and acceleration amplitude exists after the resonance speed; (2) Based on SHM data, multimodal correlation scatterplots of speed-acceleration exist and they have similar trends with the calculated formula; (3) An envelope line of polylines can be used as early warning indicators of the changes of bridge performance due to the changes of slope of envelope line and peak speed of amplitude. This work also gives several suggestions which lay a foundation for the better design, maintenance and long-term monitoring of a long-span high-speed bridge.

Review on Environment Noise Prediction Methods Emitted by High Speed Trains (고속철도 환경소음 예측 모델 고찰)

  • Cho, Dae-Seung;Jeng, Hong-Gu;Cho, Jun-Ho;Jang, Kang-Seok;Yoon, Jae-Won
    • Proceedings of the KSR Conference
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    • pp.2852-2859
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    • 2011
  • Planning and construction of railway for high speed trains up to 400 km/h are recently driven in Korea. High speed train is one of the environment-friendly fastest mass transportation means but its noise generated by rolling, traction and aerodynamic mechanism can cause public complaints of residents nearby railways. To cost-effectively prevent the troublesome noise in a railway planning stage, the rational railway noise prediction method considering the characteristics of trains as well as railway structures should be required but it is difficult to find an authentic method for Korean high speed trains such as KTX and KTX-II. In this study, recent railway noise prediction methods developed by EU countries are introduced and discussed for consulting before setting the framework of our own railway noise prediction model emitted by Korean high speed trains over 250 km/h. Especially, the new Schall 03 model (2006) developed by Germany and IMAGINE model (2007) suggested by an EU framework research project are intensively reviewed. In addition, research items required for the development of our own model are suggested.

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Aerodynamic Noise Characteristics of High-speed Trains by the Beamforming Method (빔형성 기법을 이용한 고속철도차량의 공력소음특성 도출 연구)

  • Noh, Hee-Min;Choi, Sung-Hoon;Koh, Hyo-In;Hong, Suk-Yoon
    • Journal of the Korean Society for Railway
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    • v.15 no.3
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    • pp.231-236
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    • 2012
  • In this paper, aerodynamic noise characteristics of high-speed trains were deduced from the beamforming method. First, pass-by noise of high-speed trains was measured by a microphone array system. This measurement suggested that the majority of the aerodynamic noise produced came from the bogie area, the pantograph and its cover, and inter-coach gaps. Then, beampower outputs of a position in high-speed trains were obtained from the beamforming method. By Fourier transform, sound characteristics of the position in the frequency domain were deduced from the beamforming power spectrum. From this study, aerodynamic noise characteristics from the major sources of high-speed trains were drawn.

Degraded Modes and Vigilance System Analysis of High-speed Trains Driving Activities (고속철 운전 활동 저하모드 및 경계시스템 분석)

  • Noh, Hee-Min;Hong, Sun-Ho;Cho, Yon-Ok
    • Proceedings of the KSR Conference
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    • pp.2035-2039
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    • 2008
  • In this paper, degrades modes of high-speed trains are deduced and analyzed by using Systems engineering architecture methods for a preceding research of hazard identification and scenarios deduction of the KTX. Moreover, Vigilance System of the high-speed trains is analyzed.

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