• Title, Summary, Keyword: Running Safety

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An Analysis of Running Safety for Railway Vehicle Depending on Actual Track Conditions (실제선로 조건에 따른 철도차량의 주행안전성 해석)

  • Kim, Yong-Won;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.983-988
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    • 2009
  • When the railway vehicle passing through curves & transitions, the running speed must improve by proposing the practical standard about maximum running possibility speed of each section on existing line considering running safety. In this paper, when the railway vehicle passing through curves of actual track conditions (Namsunghyun-Chungdo up & down lines), the effect that has influence on running safety is examined to devise the high speed of vehicle which passing through curves which risk of derailment is high. The running safety analysis is performed that running speed by curve radius improves 5-20% compared with existing speed under actual track conditions. In result of the running safety analysis, in case the speed condition is fewer than 15% compared with existing speed, the derailment coefficient and unloading ratio are within acceptable level. so we could confirm possibility of speed improvement on the whole Namsunghyun-Chungdo up & down lines.

Evaluation of Running Safety for Depressed Center Flat Car of 3-axle Bogie (3-축 대차 곡형평판차량의 주행안전성 평가)

  • Ham, Young-Sam;Seo, Jung-Won;Kwon, Seok-Jin;Lee, Dong-Hyung
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.5
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    • pp.559-564
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    • 2011
  • For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 90km/h for estimating the curving performance and running safety of depressed center flat car of 3-axle bogie. As the test results, could confirm the curving performance and running safety of depressed center fiat car of 3-axle bogie from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.6, and lateral force allowance limit and wheel load reduction ratio were enough safe.

Running Safety Analysis of Railway Vehicle depending on Rail Inclination Change on Actual Track of Subway Line No.3 in Seoul (3호선 실제선로 조건에서의 레일경좌 변화에 따른 철도차량 주행안전성 해석)

  • Kim, Tae Geon;Lee, Hi Sung
    • Journal of the Korean Society of Safety
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    • v.31 no.3
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    • pp.130-135
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    • 2016
  • It is very hard to analyze the train derailment safety quantitatively at the curved section because of the diversified affect parameters including the complex interaction between wheel and rail, the train conditions such as the shape of wheel, suspension system, the track conditions such as the radius of curve, cant, transition curve, and the operation conditions, etc. Two major factors related to the running safety of railway vehicle are classified as the railway vehicle and the track condition. In this study, when the railway vehicle passing through curves of actual track condition of subway line NO.3 in seoul ($Yeonsinnae{\leftrightarrow}Gupabal$), the effect that has influence on running safety depending on rail inclination. The analysis result of 1/40 rail inclination condition is more favorable on running safety than other rail inclination conditions because derailment coefficient and wheel unloading ratio are the lowest.

Analysis on Running Safety for KTX Vehicle (KTX차량의 주행 안전성 해석)

  • Kim Jae-Chul;Lee Chan-Woo;You Won-Hee
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.345-350
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    • 2005
  • KTX is the high speed train which is designed for 300km/h in maximum operation speed. But its long train set may cause unstable characters as swaying of the tail of a train and when the train is running on conventional line, its running safety is a point to be considered cautiously. In this study, we evaluated the running safety by the numerical analysis using VAMPIRE and compared the result with the test result of KHST, which is being in performance tests, for verifying the validity of analysis results

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A Study on the Running Safety by F26 Turnout and Vehicle Model (F26 분기기 및 열차모델을 이용한 주행안전성 연구)

  • Kim, Sung-Jong;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.12 no.6
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    • pp.859-864
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    • 2009
  • When the vehicle passes through turnout, the design is required to minimize the change of lateral force. Therefore, in case the vehicle passed the through turnout, we ought to execute dynamic analysis of the interaction between the vehicle and turnout in order to make an estimate of the lateral force and the derailment coefficient on the turnout. In this paper, we established the analytical model of the vehicle and turnout and analysed running safety when the vehicle passes through turnout in order to improve running safety of the vehicle on turnout. Also, to verify the vehicle and turnout model, we analysed reaction force and running behavior between wheel and rail, and running safety of the vehicle by changing cradle part and the tongue rail when the vehicle passes through turnout.

A Study on New Measurement of Derailment Coefficient for Rolling Stocks (철도차량의 새로운 탈선계수 측정방법에 관한 연구)

  • Hong, Yong-Ki;You, Won-Hee;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • pp.306-312
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    • 2007
  • The running safety of rolling stock is assessed by derailment coefficient. It requires lots of preparatory time, expenditure and high measurement technique to measure derailment coefficient. If derailment coefficient could be measured when track or vehicle is maintained, safety will be improved. The measurement and assessment of running safety is necessary for safety especially for the vehicles newly developed and started service. Therefore measurement of derailment coefficient is most important thing to secure running safety. In this paper, we examined new assessment method which could estimate derailment coefficient by measuring vibration acceleration and displacement of vehicle operating at actual track irrespective of time and place. The new method could be used effectively as a mean confirming running safety.

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Evaluation of Running Stability of Tilting Trains in Conventional Curved Track (틸팅차량의 기존선 곡선부 주행안정성 평가)

  • 엄기영;엄주환;유영화;최정호
    • Journal of the Korean Society for Railway
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    • v.7 no.4
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    • pp.367-373
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    • 2004
  • The investigation of running stability of the train for curved track is necessary in view of preventing the train from derailment caused by unbalanced forces transferred from the wheel and guaranteeing moderate level of running safety in curve sections. This paper carried out an analysis of running stability of tilting trains in conventional line which the test operation of tilting trains under development are scheduled. For this purpose, the wheel load and lateral pressure to the rail are evaluated. The criteria for the calculated wheel load and derailment coefficient are compared to the design criteria for running stability. It is founded that the running stability of tilting trains for curved track is guaranteed to have sufficient safety and the train speed in curve is governed by the geometric layout of track rather than the criteria for running stability.

Estimation of Running Safety of Electric Multiple Unit for Commute use in Incheon International Airport Railway (인천국제공항철도 통근형 차량의 주행안전성 평가)

  • Seo, Jung-Won;Hur, Hyun-Moo;Kwon, Seok-Jin;Lee, Dong-Hyung;Kwon, Sung-Tae;Hong, Yong-Ki;Park, Ok-Jeoung;Ham, Young-Sam
    • Proceedings of the KSR Conference
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    • pp.56-61
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    • 2006
  • For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 110km/h for estimating the running safety of Incheon Int'l Airport EMU. As the test results, could confirm the curving performance and running safety of Incheon Int'l Airport EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

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Estimation of Running Safety of Electric Multiple Unit for Express Train in Incheon International Airport Railway (인천국제공항철도 직통형 차량의 주행안전성 평가)

  • Ham, Young-Sam;Seo, Jung-Won;Hur, Hyun-Moo;Lee, Dong-Hyung;Kwon, Seok-Jin;Kwon, Sung-Tae;Hong, Yong-Ki;Park, Ok-Jeoung
    • Proceedings of the KSR Conference
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    • pp.109-114
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    • 2007
  • For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test to 120 km/h for estimating the running safety of express train in Incheon International Airport. As the test results, could confirm the curving performance and running safety of Incheon International Airport EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

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Aerodynamic effect of wind barriers and running safety of trains on high-speed railway bridges under cross winds

  • Guo, Weiwei;Xia, He;Karoumi, Raid;Zhang, Tian;Li, Xiaozhen
    • Wind and Structures
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    • v.20 no.2
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    • pp.213-236
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    • 2015
  • For high-speed railways (HSR) in wind prone regions, wind barriers are often installed on bridges to ensure the running safety of trains. This paper analyzes the effect of wind barriers on the running safety of a high-speed train to cross winds when it passes on a bridge. Two simply-supported (S-S) PC bridges in China, one with 32 m box beams and the other with 16 m trough beams, are selected to perform the dynamic analyses. The bridges are modeled by 3-D finite elements and each vehicle in a train by a multi-rigid-body system connected with suspension springs and dashpots. The wind excitations on the train vehicles and the bridges are numerically simulated, using the static tri-component coefficients obtained from a wind tunnel test, taking into account the effects of wind barriers, train speed and the spatial correlation with wind forces on the deck. The whole histories of a train passing over the two bridges under strong cross winds are simulated and compared, considering variations of wind velocities, train speeds and without or with wind barriers. The threshold curves of wind velocity for train running safety on the two bridges are compared, from which the windbreak effect of the wind barrier are evaluated, based on which a beam structure with better performance is recommended.