• Title/Summary/Keyword: train acceleration and deceleration

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A Study of Rail Wear by Change of Acceleration and Deceleration (가속도/감속도 변화율에 따른 레일마모 현상에 관한 연구)

  • Ha, Kwan-Yong;Kim, Hie-Sik
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.607-612
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    • 2007
  • In this paper, operation mode of train was divided into powering, coasting, and braking and rail wear phenomenon has been done comparative analysis by each section. Data of train velocity is transferred to acceleration and deceleration from ATO Logging data. Amount of rail wear has been done comparative analysis by traction force of acceleration and braking force of deceleration and a plan for management of track irregularity is come up with by the result of the analysis.

Analysis of Acceleration and Deceleration on High Performance Train for A Metropolitan Rapid Transit System (대피선 최소화를 고려한 광역·도시철도 급행화를 위한 고성능 열차 가감속도 분석)

  • KO, Kyeong Jun;KIM, Jung Tai;KIM, Moo Sun;JANG, Dong Uk;HONG, Jae Sung;RYU, Sang Hwan;JUNG, Jong Deok
    • Journal of Korean Society of Transportation
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    • v.33 no.6
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    • pp.564-574
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    • 2015
  • As shown by the popularity of the rapid train in the Seoul Metro Line No. 9, the demand for the rapidization of the metro transit has been continuously increased. However, it needs tremendous cost to construct new additional infrastructures to the existing line for the rapidization. In order to overcome the problem, utilizing the existing infrastructures such as crossing tracks as railroad sidetracks can be considered to be a good method of reducing the cost. In this case, there is a way exploiting the existing train as an express train and the advanced train, which increases both acceleration and deceleration, as a local train, but achievable acceleration and deceleration have not been analyzed rigorously. In this paper, we analyze feasible ranges and optimal values of both acceleration and deceleration of the advanced train analytically when we consider the rapidization of the metro transit utilizing the existing infrastructures and verify the results in Seoul Metro Line No. 3. Simulation results show ranges and optimal values of achievable acceleration and deceleration exist when minimum gap between an express train and a local train is smaller than 40 seconds.

Study on the Deduction of Traction/Braking Forces for the Train from Acceleration/Deceleration (가속도/감속도를 이용한 열차 견인력/제동력 추정방법에 대한 고찰)

  • Kim, Seog-Won;Kim, Ki-Hwan;Mok, Jin-Yong;Kim, Young-Guk
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.682-688
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    • 2006
  • In this paper, a method which can deduce the traction farce or the braking force from the acceleration or the deceleration of the train, has been suggested. In the case of Korean high speed train (HSR-350x), the traction force and the braking forces have been obtained by using this method. It is proven that the proposed method is a very good tool in estimating the traction force or the braking force when the train starts or stops. Also, these forces on be used to calculate friction coefficients of mechanical brakes and the transmission efficiency of the traction system.

A Study of Rail Wear by Change of Train Velocity (철도 차량 속도에 따른 레일 마모 현상에 관한 연구)

  • Ha, Kwan-Yong;Kim, Hei-Sik
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.299-300
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    • 2007
  • In this paper, slip wear phenomenon of train was studied by traction force of acceleration and braking force of deceleration. First, the slip wear phenomenon on train operation mode was analyzed when powering, coasting and braking each and then rail wear was analyzed from the slip wear data. Especially, the data proved correlation between slip wear and deceleration rather than acceleration. Second, If velocity of a train is constant, even though the velocity is high, ATO logging data and measurement data proved that the rail wear is not serious. It will help for efficient braking force operation providing fundamental data to braking step control.

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A Study on the Selection of Train Operationg Mode Minimizing the Running Energy Consumption (전동열차 운행에너지를 최소화 하는 운전모드 결정)

  • Kim, Yong-Hyun;Kim, Dong-Hwan;Kim, Chi-Tae
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.119-124
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    • 2005
  • Decision of operation performance mode to minimize the energy consumption of urban rail vehicle. This paper analyses how much acceleration and deceleration of urban rail vehicle should be applied andhow to choose an operation mode to minimize energy consumption when train runs between station within the fixed operation time. The decided operation pattern satisfying the minimum energy consumption becomes a target trajectory and a basis for the controller design criteria. To make this goal it grasps the characteristics of urban rail vehicle, realize operation energy model of urban rail vehicle and verify the accuracy of embodied model the Matlab simulation with the same operation result of real route. It searches for operation pattern to minimize operation energy by changing the acceleration and deceleration on the imaginative route and proposes operation pattern minimizing energy consumption by applying real operation data between Dolgogee-Sukgye section of Seoul Metropolitan Subway Line 6.

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Modeling Method for the Force and Deformation Curve of Energy Absorbing Structures to Consider Initial Collapse Behaviour in Train Crash (열차 충돌에너지 흡수구조의 초기붕괴특성을 고려하기 위한 하중-변형 곡선 모델링 방법)

  • Kim, Joon-Wo;Koo, Jeong-Seo;Lim, Jong-Soon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.3
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    • pp.116-126
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    • 2010
  • The Korean rolling stock safety regulation stipulates that the collision deceleration of a car body should be maintained under average 5g and maximum 7.5g during train collisions. One-dimensional dynamic model of a full rake train, which is made up of nonlinear springs/bars-dampers-masses, is often used to estimate the collision decelerations of car bodies in a basic design stage. By the way, the previous studies have often used some average force-deformation curve for energy absorbing structures in rolling stock. Through this study, we intended to analyse how much the collision deceleration levels are influenced by the initial peak force modeling in the one-dimensional force-deformation curve. The numerical results of the one-dimensional dynamic model for the Korean High-Speed Train show that the initial peak force modeling gives significant effect on the collision deceleration levels. Therefore the peak force modeling of the force-deformation curve should be considered in one-dimensional dynamic model of a full rake train to evaluate the article 16 of the domestic rolling stock safety regulations.

A Study on the Selection of Train Operation Mode Minimizing the Running Energy Consumption (전동열차 운행에너지를 최소화 하는 운전모드 결정)

  • Kim, Yong-Hyun;Kim, Dong-Hwan;Kim, Chi-Tae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.1
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    • pp.38-48
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    • 2007
  • this paper analyses how much acceleration and deceleration of urban rail vehicle should be applied and how to choose an operation mode to minimize energy consumption when train runs between stations within the fixed operation time. The decided operation pattern satisfying the minimum energy consumption becomes a target trajectory and a basis for the controller design criteria. To make this goal it grasps the characteristics of urban rail vehicle, realize operation energy model of urban rail vehicle and verity the accuracy of embodied model the Matlab simulation with the same operation result of real route. It searches for operation pattern to minimize operation energy by changing the acceleration and deceleration on the imaginative route and proposes operation pattern minimizing energy consumption by applying real operation data between stations of Seoul Metropolitan Subway Line 6.

A study on dynamic behavior in tractive and braking states of tilting train (틸팅차량의 견인 및 제동 상황시의 동적 특성에 관한 연구)

  • Park, J.Y.;Jung, I.H.;Lee, J.H.;Park, T.W.;Kim, S.W.;Kim, Y.G.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.1107-1111
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    • 2004
  • Tilting train improves a traveling velocity through giving a tilt the car-body without ride comfort deterioration in curve. Dynamic behavior in acceleration or deceleration will show quite another feature in constant velocity. In this study, we see through the dynamic behavior due to a variation of tractive force and braking force in Korean Tilting Train. Hence we compose of 3D dynamic model, as well as we check upon the property in service tractive condition and unique tractive condition with a fault motor. Besides we check upon the property in service braking condition and unique braking condition with a fault system. This study has the meaning with reference data of developing Korean Tilting Train test traveling.

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Development of TTX(Tilting Train Express)for speed-up the existing main line (한국형 기존선 고속화 틸팅열차 연구개발사업)

  • Song Dal-ho;Choe Kangyoun;Han Seong-ho
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.10a
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    • pp.3-5
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    • 2004
  • In order to speed up basic concept is to enhance high speed, curve limit speed, cross limit speed, acceleration/deceleration speed. It is important to optimal interface fundamental technology of vehicle, rail, electrical power, and signal system. Tilting train has advantage minimizing investment cost of infra railway system for increasing train limit speed in curve. the developed tilting train should be operated to commercial service speed 180Km/h of 200Km/h at KNR upgrade railroad. This paper proposed the basic model of system engineering for developing of TTX, tilting EMU (maximum operation speed : 180km/h) with speed-up of conventional railway system.

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Design of Basic model of system engineering for developing Tilting Train (틸팅차량개발 시스템엔지니어링체계 기본모델연구)

  • Han, Seong-Ho;Lee, Su-Gil;Shin, Gwang-Bok;You, Won-Hee;Kim, Gin-Hun
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.350-352
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    • 2002
  • In order to speed up basic concept is to enhance high speed, curve limit speed, cross limit speed, acceleration/deceleration speed. It is important to optimal interface, fundamental technology of vehicle, rail, electrical power, and signal system. Tilting train has advantage minimizing investment cost of infra railway system for increasing train limit speed in curve. the developed tilting train should be operated to commercial service speed 180km/h of 200km/h at KNR upgrade railroad. This paper proposed the basic model of system engineering for developing of tilting EMU(maximum operation speed : 180km/h) with speed-up of conventional railway system.

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