• Title, Summary, Keyword: track impact factor

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A Study on Relationship between Track Impact Factor and Track Support Stiffness of Turnout System on Urban Transit (도시철도 분기기 궤도구조의 궤도지지강성과 궤도충격계수의 상관관계에 관한 연구)

  • Choi, Jung-Youl;Park, Jong-Yoon;Lee, Kyu-Yong;Chung, Jee Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.2
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    • pp.461-466
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    • 2020
  • In this study, the relationship between the track support stiffness and the track impact factor for a sleeper floating track and a turnout system with wood ties currently employed in Korean urban transit was assessed by performing field tests using actual vehicles running along the service lines. Field tests were performed on four track systems (i.e., sleeper floating track, and point, lead and crossing sections of turnout system). The theoretically designed track impact factor and track support stiffness were compared with the corresponding track impact factor and track support stiffness measured through field tests for the target tracks on the service line. The track impact factor for the service line appeared to increase with the deviation of track support stiffness according to vehicle driving direction; therefore, it was inferred that the deviation of track support stiffness between each track section directly affected the track impact factor.

Evaluation of Track Impact Factor in the Conventional Line (기존선 궤도의 충격계수 산정에 관한 연구)

  • 엄주환;유영화;엄기영
    • Journal of the Korean Society for Railway
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    • v.6 no.4
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    • pp.239-245
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    • 2003
  • In this paper, the track impact factor of conventional line was evaluated using the data for wheel load measured in field and the properties of current operating trains. The equation for track impact factor was presented through the statistical analysis of variational ratio in wheel load and compared with other design equations in domestic and foreign countries. A review on the safety of track system in conventional line was made from the relationship between the velocity and the corresponding impact factor. It was found that the impact factor from the proposed equation is a little less than the values from the equations adopted in both AREA and domestic railway, while it is same as the equation for continuous welded rail(CWR) in Japan. Therefore it could be said that the track satisfies a criteria for dynamic load caused by the train and the corresponding level of safety is guaranteed for dynamic load of the train

Experimental Study on the Evaluation of Behavior for Floating Track System Using a Resilient Rubber Mat (고무방진매트가 적용된 플로팅궤도시스템의 거동분석을 위한 실험적 연구)

  • Lee, Siyong;Jeong, Incheol;Choi, Jungyoul;Park, Yonggul
    • Journal of the Korean Society for Railway
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    • v.17 no.4
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    • pp.281-288
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    • 2014
  • The objective of this study was to estimate the vibration reduction capacities of a floating track system using a resilient rubber mat, and to compare the results with the track support stiffness and track impact factor of a conventional slab track system by performing field tests using actual vehicles running along a service line. The theoretically designed track support stiffness and track impact factor were compared with the measured track support stiffness and track impact factor for each tested track. The calculated and measured track support stiffness of the floating track system were found to be similar, and the floating track system satisfied the design specifications of the track impact factor. The overall vibration level and track support stiffness of the floating track system were thereupon found to be significantly lower than those of the conventional slab track system. The experimental results thus showed that the vibration reduction effect of the floating track system is greater than that of the conventional slab track.

An Experimental Study on the Evaluation of Track Impact factor on the Various Track Type in Urban Transit (도시철도 궤도형식별 궤도 충격계수 산정을 위한 실험적 연구)

  • Kim, Jae-Weon;Kim, Man-Cheol;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • pp.382-399
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    • 2011
  • Impact factor of concrete and ballast track which has been used in Korea railway was applied to equation (1+0.513V/100) from AREA. As the use of this equation, overcapacity of track design might be occurred. Therefore, this study compared impact of ballast track (well, bad) and concrete track (sleeper embeded system, rail floating and sleeper floating) by field test to analyzing dynamic effect of track structure's characteristic and wheel load on service line. In addition, it suggested a method to generate reasonable track impact factor on each track type.

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The Evaluation of Track Impact Factor on the Various Track Type in Urban Transit (도시철도 궤도구조별 궤도충격계수 평가)

  • Choi, Jung-Youl;Park, Yong-Gul;Lee, Sang-Min
    • Journal of the Korean Society for Railway
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    • v.14 no.3
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    • pp.248-255
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    • 2011
  • Impact factor of concrete and ballast track which has been used in Korea railway was applied to equation (1+0.513V/100) from AREA. As the use of this equation, overcapacity of track design might be occurred. Therefore, this study compared impact of ballast track (well, bad) and concrete track (sleeper embeded system, rail floating and sleeper floating) by field test to analyzing dynamic effect of track structure's characterstic and wheel load on service line. In addition, it suggested a method to generate reasonable impact factor on each track type.

Evaluation on Fatigue Behavior of Resilience pad for Sleeper Floating Track System in Urban Transit (도시철도 침목플로팅궤도(STEDEF)의 침목방진패드 피로거동 분석)

  • Choi, Jung-Youl;Lee, Jeong-Sug;Bong, Jae-Geun;Kim, Su-Jin;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.3
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    • pp.347-352
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    • 2020
  • In this study, the variation of track impact factor according to the spring stiffness change rate of sleeper resilience pad was analyzed based on field measurements. In addition, the correlation between field measurement results and 7 million fatigue test results was verified. The fatigue effect diagram of the sleeper resilience pads was presented considering the nonlinear deterioration characteristics of the sleeper resilience pads used for the STEDEF track. Based on the field measurement results, the nonlinear characteristics of the track impact factor for the spring stiffness change rate over 30% of sleeper resilience pad on the track impact factor-track support stiffness diagram were analyzed to be consistent with the fatigue test results.

Evaluation of Dynamic Behavior of Rail Joints on Personal Rapid Transit Track (소형무인경전철(PRT)궤도 레일이음매의 동적거동 분석)

  • Choi, Jung-Youl;Kim, Jun-Hyung
    • Journal of the Korean Society of Safety
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    • v.31 no.5
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    • pp.89-94
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    • 2016
  • The objective of this study was to estimate the dynamic behavior of a personal rapid transit(PRT) track system using a rail of rectangular tube section and a rail joint of sliding type, and to compare the results with the normal rail and rail joint of a PRT track system by performing field measurements using actual vehicles running along the service lines. The measured vertical displacement of rail and sleeper, and vertical acceleration of rail for the normal rail and rail joint section were found to be similar, and the rail joint of sliding type satisfied the design specifications of the track impact factor for a conventional railway track. The experimental results showed that the overall dynamic response of the rail joint were found to be similar to or less than that of the normal rail, therefore the rail joint of sliding type for PRT track system was sufficient to ensure a stability and safety of PRT track system.

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.

Evaluation of Impact Factor on Ballast Track in Subway using Field Test (지하철 자갈도상 케도의 충격계수 평가)

  • Kang, Kee-Dong;Park, Yong-Gul;Choi, Jung-Youl
    • Journal of the Korean Society for Railway
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    • v.9 no.6
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    • pp.784-791
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    • 2006
  • This paper presents the test results to evaluate the healthiness of the ballast in subway. The test includes the dynamic load test in servicing Line the screen classification test of aggregates and the wear test. From the results, the aspect and the property of the ballast are evaluated. The dynamic load tests explain the relationship between the deterioration of the ballast and the fluctuation of loads. The assessment of impact factor based on the field test results in a good property of test blocks is proposed.

Evaluation of Impact Factor on Ballast Track in Subway using Field Test (지하철 자갈도상 궤도의 충격계수 평가)

  • Park, Kyun-Seo;Son, Chol-Su;Yun, Jong-Kyeong;Choi, Jung-Youl;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • pp.484-493
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    • 2006
  • This paper is presented the test results to evaluate the healthiness of the ballast in subway. The test includes the dynamic load test in servicing Line the screen classification test of aggregates and the wear test. From the results, the aspect and the property of the ballast are evaluated. The dynamic load tests the relationship between the deterioration of the ballast and the fluctuation of loads. The assesexplain sment of impact factor based on the field test results in a good property of test blocks is proposed.

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