• 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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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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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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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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A Relay-assisted Secure Handover Mechanism for High-speed Trains

  • Zhao, Yue;Tian, Bo;Chen, Zhouguo;Yang, Jin;Li, Saifei
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.2
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    • pp.582-596
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    • 2019
  • Considering that the existing Long Term Evolution is not suitable for the fast and frequent handovers of high-speed trains, this paper proposes a relay-assisted handover mechanism to solve the problems of long handover authentication time and vulnerable to security attacks. It can achieve mutual authentication for train-ground wireless communication, and data transmission is consistent with one-time pad at the same time. The security analysis, efficiency analysis and simulation results show that the proposed mechanism not only realizes the forward security and resists many common attacks, but also effectively reduces the computational overhead of train antenna during the secure handover process. When the running speed of a train is lower than 500km/h, the handover delay is generally lower than 50ms and the handover outage probability is less than 1.8%. When the running speed of a train is 350km/h, the throughput is higher than 16.4mbps in the process of handover. Therefore, the secure handover mechanism can improve the handover performance of high-speed trains.

Modeling of SVPWM and Control Method for Driving Systems of High-speed Trains by using Multi-level Power Converters (고속전철 추진시스템을 위한 멀티레벨 전력변환기의 제어기법 및 SVPWM 모델링)

  • Lee, Dong-Myung;Hong, Chan-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.12
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    • pp.136-145
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    • 2009
  • This paper proposes control methods and simulation models of a driving system, which consists of converters and inverters, for high speed trains employing multi-level power converters. The control method of a single phase three-level converter for high-speed trains is designed to use DC values instead of instantaneous current values which are usually used in single-phase application, so that it results in a fast and robust voltage control response. In addition, simulation models of Space Vector Pulse Width Modulation (SVPWM) for single phase three-level converters as well as three level inverters are proposed. Experimental results demonstrate the validity of the simulation model for three-level inverters.

Analysis of Dynamic Characteristics of High Speed Trains Using a Time Varying Frequency Transform (시간-주파수 변환을 이용한 고속철도차량의 동특성 분석)

  • Lee, Jun-Seok;Choi, Sung-Hoon;Kim, Sang-Soo;Park, Choon-Soo
    • Proceedings of the KSR Conference
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    • pp.841-848
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    • 2008
  • This paper examined dynamic characteristics of high speed trains using a time varying frequency transform. Fourier transform based methods are frequently used for the calculation of the dynamic characteristics of trains in the frequency domain, but they cannot represent the time-varying characteristics. Therefore it is necessary to examine their characteristics using a time-varying frequency transform. For the examination, the non-stationary vibration of wheelset, bogie, and carbody are measured using accelerometers and stored in a data aquisition system. They are processed with localization of the data by modulating with a window function, and Fourier transform is taken to each localized data, called the short-time Fourier transform. From the processed results, time varying auto-spectral density, cross-spectral density, frequency response, and coherence functions have been calculated. From the analysis, it is confirmed that the time varying frequency transform is a useful method for analyzing the dynamic characteristics of high speed trains.

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