• Title/Summary/Keyword: rate of wheel load reduction

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An Assessment of Derailment Safety of Railway Vehicle depending on Curve Rail Condition (곡선부 선로 조건에 따른 차량의 탈선안전도평가)

  • Yoo, Hee-Sang;Park, Kwang-Soo;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.953-958
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    • 2007
  • To assess the derailment safety of the Samaeul Train, We developed a fleet analysis model and carried out sensitivity analysis of the variables related to derailment factors with ADAMS/Rail computing analysis method. Depending on the variation of the running speed in curve section, derailment coefficient and wheel load reduction rate are high at right side wheels in slow running speed section and low at left side wheel in high running speed. According to decreasing the radius of curve, derailment coefficient and wheel load decreasing rate are increased. Derailment coefficient is proportional to transition curve length and wheel load decreasing rate is constant. Cant value rising causes wheel load deduction rate rising.

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Evaluation of Train Running Safety for Direct Fixation Concrete Track on Light Rapid Transit (경전철 직결식 콘크리트 궤도구조의 열차주행안전성 평가)

  • Choi, Jung-Youl;Kim, Jun-Hyung;Chung, Jee-Seung;Lee, Sun-Gil
    • Journal of the Korean Society of Safety
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    • v.32 no.5
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    • pp.41-46
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    • 2017
  • The coefficient of derailment and the rate of wheel load reduction were used as the index of train running safety that was directly affected the train derailment safety. In aspects of track, the train running safety depends on the complex interaction between wheel and rail, and the track-vehicle conditions (i.e., the curvature, cant, track system, vehicle speed and the operation conditions, etc). In this study, the relationship between the train running safety and the track curvature and vehicle speed for direct fixation concrete tracks currently employed in Korean light rapid transit was assessed by performing field tests using actual vehicles running along the service lines. The measured dynamic wheel load, lateral wheel load and lateral displacement of rail head were measured for same train running on four tested tracks under real conditions, which included curved and tangent tracks placed on the tunnel and bridge, thus increasing the train speed by approximately maximum design speed of each test site. Therefore, the measured dynamic track response was applied to the running safety analysis in order to evaluate the coefficient of derailment, the rate of wheel load reduction and the track gauge widening at each test site, and compare with the corresponding Korean train running safety standard. As the results, the lateral track response of direct fixation concrete track appeared to increase with the decreased track curvature; therefore, it was inferred that the track curvature directly affected the train running safety.

Safety evaluation of tilting train on circular curve (틸팅열차의 원곡선부 주행시 안전성 평가)

  • Kim, Sang-Soo;Eum, Ki-Young;Bae, Jae-Hyoung
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1703-1712
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    • 2010
  • The safety of tilting train running on curved track is, in general, evaluated with a derailment coefficient calculated by the ratio of wheel load and lateral force, Particularly on curve, the wheel load and lateral force on rail may cause trackbed to be deformed, depending on their intensity, and moreover, often result in critical accident such as derailment. This study hence was intended to identify the cause of wheel load and lateral force so as to suggest the allowable wheel load reduction rate, lateral force limit and derailment coefficient, thereby quantitatively evaluating the operational safety of tilting train. This study therefore was aimed to analyze the wheel load and lateral force occurred during tilting train's operation on circular curve in such a way of comparing with traditional trains, by axle and speed, in a bid to eventually evaluate the operational safety of tilting train.

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Dynamic Behavior of Direct Fixation Track on Yeongjong Grand Bridge (영종대교 강직결 궤도구조의 동적거동에 관한 연구)

  • Choi, Jung-Youl;Lee, Kyu-Yong;Chung, Jee-Seung;Ahn, Dae-Hee;Kim, Soo-Hyung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.443-448
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    • 2020
  • In this study, field measurements were performed to analyze the effects of train types (AREX, AREX Express, KTX, KTX-Sancheon) and train speeds on the dynamic behavior of the direct fixation track structure on Yeongjong grand bridge by bridge type (truss bridge, suspension bridge). Based on field measurement results, the track impact factor and train running stability (coefficient of derailment, Rate of wheel load reduction, lateral displacement of rail head) are compared with domestic and foreign standards and regulations to influence the dynamic behavior of direct fixation track. As a result, the differences in the dynamic behavior of the direct fixation tracks by the type of bridges of Yeongjong bridge are not significant, but it was analyzed that these were more directly affected by the magnitude of the train load. Therefore, it is necessary to establish the reinforcement plan of the direct fixation track structure on Yeongjong grand bridge in consideration of the increase of the track impact factor and dynamic track force.