• Title, Summary, Keyword: 차세대고속철도

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Estimation of Rail Irregularities by using Acceleration values (가속도 값을 이용한 궤도 불규칙도 검측)

  • Kim, Young-Mo;Park, Chan-Kyoung;Choi, Sung-Hoon;Kim, Sang-Soo;Park, Choon-Soo
    • Proceedings of the KSR Conference
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    • pp.2173-2178
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    • 2008
  • Railroad is the major factor of vibration source in railway vehicles, and it must carefully maintained the original condition to secure the safety and good ride comfort of passenger. Measuring the condition of rail irregularities such as surface, alignment, gauge, twist and cant etc is required to maintain the good performance of railroad. Currently, the various rail irregularity measurement systems(EM120, ROGER1000K and the Total Rail Irregularity Measurement system of Korea High Speed Train) are operated in Korea to estimate the rail irregularity. It is hard to verify the correlation of one rail irregularity data of a measurement system with the other, because they have been adopted different rail irregularity estimation methods. The best method securing the reliability of the irregularity data is the direct confirmation on the ground where the measurement system had detected as a fault section, but it is impossible to apply all sections simultaneously due to limitation of time, labor, cost and equipments. There is a method to secure the reliability of the data by using acceleration values. Rail irregularities, the major factor of vibration in railway vehicle, are transmitted to the vehicle acceleration through masses, springs, dampers and joints as the system dynamic formation. In this study, Transition Function has been adopted by using the rail irregularity and the acceleration value regarding as input & output parameters respectively. It has been verified by comparing the analyzed results with real measured irregularity data from the Total Rail Irregularity Measurement system of Korea High Speed Train. Also various methods has been accomplished to verify the correlation between rail irregularities and acceleration values.

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Analysis of the Suspension Characteristics for Next Generation High Speed Train Formed with 6 Cars in Concept Design Stage (개념단계에서 차세대고속철도 6량 편성차량의 현가요소 특성 분석)

  • Park, Chan-Kyoung;Kim, Yong-Guk;Kim, Ki-Whan;Kim, Young-Mo
    • Proceedings of the KSR Conference
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    • pp.387-392
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    • 2008
  • Next Generation High Speed Train having a distributed electrical motor system has just been developing to aim the experimental maximum speed at 400km/h since August, 2007. This project is in stage of concept design and so, it needs to take some review and analysis the characteristics of suspensions on the view of concept design. A train dynamic modeling is modified with the one car model presented in the previous conference and it was extended to 6cars models having the same suspensions and added some connection's characteristics between the cars with Vampire program. It is used to analyze the effect on the dynamic performances according to the variation of primary and secondary suspension characteristics in the condition of 6 cars configuration. The results would be useful to manage the potential risks in the next stage of basic and critical design that will be done by the manufacturing company.

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A Study on Maximum Speed Test for On-board Signalling Equipment in HEMU-400x (차세대고속열차 차상신호장치 최고속도 시험방안에 관한 연구)

  • Shin, Duc-Ko;Lee, Jae-Ho;Lee, Kang-Mi;Kim, Yong-Kyu;Park, Choon-Soo
    • Journal of the Korean Society for Railway
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    • v.12 no.5
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    • pp.670-677
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    • 2009
  • This paper is a study of testing on-board signalling equipment in advanced high speed rail at the maximum speed of 400km/h. The on-board signalling equipment in advanced high speed rail provides operating information to the driver when operating at ATC, ATS, and ATP sections, and maintains safety from driver oversight, signalling equipment malfunction, natural disasters and so on. Since the testing train performance of advanced high speed rail at 400km/h must include the function test of on-board signalling equipment, this thesis focuses on the function test of on-board signalling equipment and analyze the necessity of the test at the maximum speed. Finally, it is suggested to change some infrastructure and to use specific test methods to test the train performance at the maximum speed in high speed line ATC section.

Analysis of the Frequency Weighting Curve for the Evaluation of Ride Comfort (승차감 평가를 위한 주파수 보정곡선의 분석)

  • Kim, Y.G.;Park, C.K.;Kim, S.W.;Kim, K.H.;Paik, J.S.
    • Journal of the Korean Society for Railway
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    • v.13 no.6
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    • pp.552-558
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    • 2010
  • Ride comfort of railway vehicles is affected by many factors, such as vibration, noise, smell, temperature, visual stimuli, humidity and a seat design. In general, vibration, which originates from vehicle motion, is considered as the primary concern. In evaluating the ride comfort, relationship between passenger's feeling and vibration characteristics is very important because human feeling is dependent on frequency spectrum of vibration. Therefore, the weighing functions in frequency domain are used to evaluate the ride comfort of railway vehicles. In the present paper, we have analyzed the characteristics of the frequency weighting curves defined in many standards and reviewed the effect resulting from their difference on the ride comfort.

An Evaluation on Derailment according to Running Safety of Next-Generation High Speed Train (HEMU-430X) (차세대 고속열차(HEMU-430X)의 주행 안전에 따른 탈선평가)

  • Sim, Kyung-Seok;Park, Tae-Won;Lee, Jin-Hee;Jeong, Gi-Beom
    • Journal of the Korean Society for Railway
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    • v.15 no.4
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    • pp.343-351
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    • 2012
  • With the cooperation of many research institutes and railway companies, the next generation high speed train is under development for many years. To confirm the safety requirement of the developed high speed train, multibody dynamic analysis is implemented. Through this analysis, railway derailment and lateral guiding force simulation was evaluated according to UIC code 518 OR for international railway vehicle. Test results were compared by limit value of safety criteria. Safety evaluation results, according to international standards, would provide basic reference data of ensuring safety speed and track radius curve. The safety of the train at the maximum speed is verified by numerical analysis results.

Researches on Next-Generation Mobile Communication Services (차세대 이동통신 서비스 연구)

  • Yoon, S.I.;Shin, G.C.
    • Electronics and Telecommunications Trends
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    • v.21 no.3
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    • pp.11-22
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    • 2006
  • 이동통신 시스템은 현재의 3세대 IMT-2000 시스템에 이르기까지 지속적인 진화를 거듭하였고 이제 사용자의 다양한 이동통신 서비스 요구 및 기대치를 충족시키기 위한 4세대 이동통신 시스템 및 서비스에 대한 관심이 지속적으로 증가하고 있다. ITU-RWP8F에서는 "보다 빠른 데이터 전송속도의 지원"과 "서로 다른 유무선 접속 시스템과 융합(convergence)"을 목표로 시간과 장소 및 대상의 구속이 없이 언제 어디서나 누구와도 고속 멀티미디어 통신 서비스를 지원하는 것을 차세대 이동통신 시스템의 비전으로 설정하고 있다. 이러한 차세대 서비스 비전을 실현하기 위하여 현재 WWRF, WWI, FMS, mITF, FuTURE Forum 및 NGMC Forum과 같은 주요 연구 단체는 개인의 관심사, 환경, 일상 생활이 고려된 각 개인의 통신 공간에서 상황에 따라 변화하는 개인의 요구사항이 반영된 차세대 서비스에 대한 연구를 수행하고 있다. 본 논문에서는 앞서 언급한 각 연구 단체가 수행중인 주요 연구 내용을 살펴보고자 한다.`