• Title, Summary, Keyword: High speed application

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Application of FBG Sensors to the Monitoring of High Speed Trains (고속철도차량 모니터링을 위한 FBG 센서의 응용)

  • Eun, Jong-Pil;Choi, Sung-Hoon;Park, Choon-Soo;Kang, Dong-Hoon;Song, Sung-Jin;Kim, Ki-Hwan
    • Proceedings of the KSR Conference
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    • pp.544-548
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    • 2008
  • Typically electronic resistance type sensors have been used for measurement system of high-speed trains. But due to a large number of measurement quantities, we had difficulties in installing and maintaining the cables that connect sensors and measuring devices. Furthermore, signals obtained from the electronic resistance type sensors are often distorted because the sensors and cables are vulnerable to electro-magnetic interference (EMI). In this paper the characteristic of FBG sensors are compared with those of electronic resistance type sensors in application for the measurement system of high-speed trains. FBG sensors have advantages because of their multiplexing characteristic and robustness to EMI environment.

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A Study on the development strategy for TCS in technology context (기술발전 추이에 따른 열차제어장치의 개발방향)

  • Lee, Jae-Ho;Shin, Duck-O;Lee, Kang-Mi;Hong, Hyo-Sik
    • Proceedings of the KSR Conference
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    • pp.642-646
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    • 2008
  • Signaling system, for which ensuring safe train operation, must be a fail-safe system with higher reliability and safety. TCS has made significant improvements both on signaling system, from relay based ground signaling system to computer based on-board system, and on driving mode, form low speed and low density driving to TCS supporting high speed and high density driving. In addition, TCS has been applied to rolling stock with a wide variety of context according to the characteristics of rolling stock or railway infrastructure. In this paper, therefore, we confirmed the basic concept of ATC system and analyzed its development process in technology context via referencing international cases and ATC systems introduced and applied in Korea. Based on those analyses, we suggested the new TCS development strategy for its suitable application to high speed line, conventional line and metro, and we also provided technical considerations related to TCS application.

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Engineering Feasibility of IT and Smart Sensor Technology Applications for the Next Generation High Speed Train (차세대 고속전철에 적용할 IT 및 스마트센서 기술의 타당성 검토에 관한 연구)

  • Chang, Duk-Jin;Kang, Song-Hee;Song, Dahl-Ho
    • Proceedings of the KSR Conference
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    • pp.547-556
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    • 2009
  • In this paper, we tried to find the engineering feasibility of the component functions of the seven selected application technologies which are going to be installed on the next generation high speed train as the IT and smart sensor application technologies. The component functions of the seven applications, including the "Emergency or reminder notification", were identified and analyzed. In order to justify the feasibility of applications development, effect analysis and sufficiency analysis were performed. In effect analysis, how each function has an effect on safety, convenience, and efficiency of the passengers and attendants was evaluated. In sufficiency analysis, the importance and implementability of each function as a component was evaluated. The feasibility analysis was focused on the technical aspects of the functions. The following work will be the settlement of the final applications that are going to be designed and implemented. This will be done by studying the strategic feasibility in relation to the service or business of the high speed train.

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Effect of Slide Motion Control and Friction Characteristics on Formability of Ultra High Strength Steel (초고강도강판의 성형성에 미치는 슬라이드 모션 제어와 마찰특성의 영향)

  • Song, J.S.;Youn, K.T.;Heo, J.Y.;Park, C.D.;Kim, Y.H.
    • Transactions of Materials Processing
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    • v.27 no.2
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    • pp.107-114
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    • 2018
  • Although the application of high strength steel is increasing to cope with the various updated regulations of automobiles, high strength steel sheets are difficult to formulate due to the high tensile strength and low elongation of those materials. In this study, the slide motion was controlled using a servo press in order to improve the formability of the process of manufacturing ultra-high strength steel of above 1.2GPa. Also, the friction characteristics of the slid motion were investigated through a high speed friction test. The slide motion was optimized by adjusting the number of steps, the rising start position and the rise height of the slide. At the same time, it is noted that the optimal slide motion increased the forming depth by about 40%. From the results of the high speed friction test, the application of the slide motion reduces friction resistance, thereby improving friction characteristics and improving formability.

The Development of 150HP/ 70,000rpm Super High Speed Motor Driver for Direct Drive Method Turbo Compressor (직접 구동방식의 터보 압축기를 위한 150마력,70,000rpm 초고속 전동기 구동 시스템 개발)

  • 권정혁;변지섭;최종경
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.40 no.1
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    • pp.45-54
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    • 2003
  • Turbo compressor needs high speed rotation of impeller in structure, high rated gearbox and conventional induction motor. This mechanical system increased the moment of inertia and mechanical friction loss. Resently, the study of turbo compressor applied super high speed motor and drive, removing gearbox made its sire small and mechanical friction loss minimum. This paper describes the implementation of the vector control schemes for a variable-speed 131㎾ PMSM(Permanent Magnet Synchronous Motor) drive in super-high speed application.

Characteristic Analysis of a High Speed Permanent Magnet Synchronous Generator considering the Operating Speed (구동 속도를 고려한 고속 영구자석형 동기발전기의 특성 해석)

  • Jang, Seok-Myeong;Ko, Kyoung-Jin;Cho, Han-Wook;Jeong, Yeon-Ho;Oh, Won-Gku
    • Proceedings of the KIEE Conference
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    • pp.116-118
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    • 2006
  • Recently more attention is paid to the development of high-speed permanent magnet (PM) synchronous generators driven by gas-turbine, since they are conductive to high efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. In this paper, the performance analysis of a high-speed PM synchronous generator for military power application considering the min-max operating speed is presented. The output current and power versus DC-link voltage loci can obtained by solving the PM machine's steady-state equations for variable resistive load.

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Precast Full Span Construction of Continuous PSC Box Girder Bridge for High Speed Railway (고속철도 PSC 박스거더 연속고의 프리캐스트 경간 일괄 가설)

  • Park Jeong Wha;Kim Kwang Soo;Sim Chungwook;Yoon Chul-Soo
    • Proceedings of the KSR Conference
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    • pp.1168-1173
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    • 2004
  • Bridges and tunnels mainly compose the structural system of Kyung-bu high-speed railway in Korea and the prestressed concrete box girder bridges are applied for the most part of bridge structures. Precast full span construction method was practiced in the construction of many prestressed concrete box girder bridges in Kyung-bu high speed railway for the high quality, great construction speed, low construction cost and construction safety. However, there have been no application of this method in continuous bridges until now. Therefore, a new advanced precast full span construction method is developed using pre-tensioning for precast and post-tensioning in alternating the simple span into a continuous bridge system. since the high-speed railway trains can cause dynamic problems in a continuous bridge. This study shows the structural behavior and the construction process of the new advance method.

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Evaluation of Interior Sounds of High-speed Trains Considering the Condition of Tunnel Running (터널 주행을 고려한 고속열차의 실내소음 특성 평가)

  • Kim, Jae Ho;Kim, Ho Jun;Jeon, Jin Yong
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.3
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    • pp.253-260
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    • 2014
  • conducted. In-situ measurements were conducted to investigate the noise characteristics in high-speed trains such as KTX and KTX-Sancheon. Binaural microphones and spherical microphone were adopted to record and evaluate the spectral characteristics and noise incidence characteristics at the seats in the passenger cars. Environmental elements were also recorded during the noise measurements using a camcorder and GPS application. In addition, auditory tests were conducted to investigate annoyance of interior noise of high-speed trains. Based on the objective measure and subjective responses on interior noise, statistical analysis such as correlation and regression analyses were carried out. From the results perception models for evaluating the interior noise of high-speed train were derived.

Lubrication Performance Analysis of a Spiral Groove Dry Gas Seal for a High-Speed Flying Object (고속비행체용 스파이럴 그루브 드라이 가스 시일의 윤활 성능해석)

  • Lee An Sung;Kim Jun Ho
    • Tribology and Lubricants
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    • v.21 no.1
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    • pp.8-15
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    • 2005
  • In this study a general Galerkin FE lubrication analysis method is utilized to analyze the complex lubrication performance of a spiral groove seal, which is being designed and developed for a high-speed flying object application operating at a high-speed of over 50,000 rpm. As at the equilibrium seal clearance the axial stiffness of the seal is predicted to have almost such a constant high value of $1.04\times10^8\;N/m$ regardless of a rotating speed, the seal is expected to maintain a stable thickness of lubrication film under a certain external excitation acting. Also, as even at an ultra high-speed of 80,000 rpm the axial damping of the seal is shown to have a rotatively high value of 5,775 N-s/m, the dynamic stability of the seal system at the axial degree of freedom is assured well enough.

Study on the Key Technologies for Performance and Operation of the High-Speed EMU (동력분산형 고속철도 차량성능 및 운용 기반기술 연구)

  • Song, Dahl-H.;Min, Kyung-H.
    • Proceedings of the KSR Conference
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    • pp.1227-1232
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    • 2008
  • High-speed train of push-pull type called as G7 train has been developed and chosen as the model of KTX-II which will be operated on Honam Line nexr year. However, the EMU-type high-speed train appeared to be the recent trend that foreign markets have shown. Also, in the near future, a great number of new train sets are needed to accommodate the increased passengers in our country. Thus, development of the high-speed EMU was decided, planned, and started. In the development, included were almost all fundamental key technologies such as noise and vibration reduction in a passenger cabin, running characteristics, aerodynamic analysis, crashworthiness evaluation, EMI/EMC analysis, design of the cooling system for the propulsion control system, enhanced performance of transformer and switching converters, synchronous traction motor with permanent magnets, new design of front nose and ergonomic interiors, application of advanced information technology(IT) and smart sensors and the cost reduction of construction of railway bridges, etc. Each key technologies are carried out as sub-project independently but under the supervision of a project. The project will develop the high advanced level of technologies and provide necessary know-why's and support the team in charge of the development of the high-speed EMU, Hyundai Rotem Co. Ltd. The high-speed EMU will be successfully developed with the support of the project.

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