• Title, Summary, Keyword: Track irregularity

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Trend of the track irregularity with reinforced Railroad Roadbed materials measuring in Service Railroad line (실 열차구간에서 측정된 강화노반재료별 궤도틀림 진행 평가)

  • Choi, Chan-Yong;Lee, Jee-Ha;Park, Chang-Woo;Kim, Sung-Soo
    • Proceedings of the KSR Conference
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    • pp.1833-1837
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    • 2007
  • The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from bearing softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Presently, the reinforced roadbed was widely constructed in high speed line and is proceeding a research about economical thickness and methodologies for the design of reinforced roadbed. Field test section is located at Kongbu line which is from Suwon to Pungtack. In this study, field test were measured a track irregularity with several types of reinforced roadbed materials by using Track Master. The field testing were conducted between March, 2006 and March, 2007.

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Trend of the Long-term track irregularity with Reinforced Railroad Roadbed materials (강화노반재료별 장기 궤도틀림 진행 평가)

  • Choi, Chan-Yong;Lee, Jee-Ha;Park, Tae-Hwan
    • Proceedings of the KSR Conference
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    • pp.281-285
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    • 2008
  • The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from bearing softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Presently, the reinforced roadbed was widely constructed in high speed line and is proceeding a research about economical thickness and methodologies for the design of reinforced roadbed. Field test section is located at Kyungbu line which is from Suwon to Cheonan In this study, field test were measured a track irregularity with several types of reinforced roadbed materials by using Track Master. The field testing were conducted between March, 2006 and April, 2008.

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Development of Evaluation Method of Vibration-Reduction Efficiency in Slab Track (슬래브궤도의 방진효율성 평가기법 개발)

  • 양신추;강윤석;김만철;이종득
    • Proceedings of the KSR Conference
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    • pp.463-470
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    • 1999
  • In this paper, a numerical method for evaluating the efficiency of vibration reduction of substructure under slab track is developed for optimal design of floating slab track. The equation of motion for train and track interaction system is derived by applying compatibility condition at the contact points between wheels and rails. The train is modelled by 3-masses system and the track by continuous support beam system. Numerical analyses are carried out to investigate the effect of train speed, stiffness and damping of slab-pad, and track irregularity upon vibration reduction in substructure under the track.

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Vibration Analysis and Mitigable Countermeasures of Semi High-speed Subway Electric Trains (준고속 도시철도의 진동분석 및 저감대책)

  • Park, Ki-Soo;Choi, Yeon-Sun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.10
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    • pp.1014-1023
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    • 2008
  • Subway electric trains need to be faster for accommodation of long distance passengers. The faster run of the existing trains results in deterioration of ride quality due to noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed and an ADAMS/Rail model was set up to verify the running test results. The experimental results show that the sources of the cabin noise and vibration basically comes from the irregularity of the railroad track and the deterioration of the connection part between cabin and bogie. Consequently for mitigation of noise and vibration of the electric train, the redesign of the center pivot with softer stiffness and the minimization of rail irregularity are necessary. the frequent maintenance of the train will lead to better comport.

Analysis on Safety and Ride Comfort of KTX According to Track Surface (고저틀림에 따른 KTX 주행거동 특성 분석)

  • Choi, Il-Yoon;Koo, Dong-Hoe;Hwang, Seok-Yeol;Lim, Yun-Sik
    • Journal of the Korean Society for Railway
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    • v.13 no.6
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    • pp.583-588
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    • 2010
  • Track irregularities is one of key factors influencing running behavior of train. In order to ensure safety and ride comfort, it is highly important that relationship between track irregularity and running behavior of vehicle is identified and the criteria for track irregularities is adequately established. Numerical analysis was conducted to investigate influence of surface on running behavior of KTX and various wavelength and amplitude of surface were considered in numerical analysis. Derailment, lateral load, bogie acc., body acc. of numerical analysis results were investigated to evaluate the effect on track profile on safety and ride comfort of KTX.

Dynamic analysis of eddy current brake system for design evaluation (와전류 제동장치 설계검증을 위한 동역학적 해석)

  • Chung, Kyung-Ryul;Kim, Kyung-Taek;Paik, Jin-Sung;Benker, T.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.110-115
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    • 2002
  • In this paper, the results of an analysis of the dynamic behavior of the eddy current brake(ECB) system are presented. The measured irregularity of the track in Korean high speed line and the track irregularity given by ERRI(high level) were used for simulation. The wheel-rail profile combination were analyzed with different rail gauges. A model of the bogie with an substitute body for the carbody was implemented in the Multi-body-Simulation Program SIMPACK. The ECB frame was modelled both as flexible body and as rigid body. Four different driving conditions were analyzed. In this study dynamic behavior in general were performed to evaluate the design of eddy current brake system and specially the effect of damper was also studied. A comparison of simulations with and without damper shows that the damper have most effect for lower speed. The simulation results will be verified by comparison with measured data from on line test and also used for improving design.

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Dynamic Response Characteristics for Two-layered Trackbed Structure by Train Load (열차하중에 의한 이층노반구조의 동적 응답특성)

  • Lee, Il-Wha
    • Journal of the Korean Society for Railway
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    • v.14 no.2
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    • pp.160-166
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    • 2011
  • It is difficult to clarify the dynamic response characteristics of trackbed because of various environmental conditions. However, track irregularity be affected by ununiformed bearing capacity and its dynamic response, study for dynamic response characteristics is required to investigate the cause of track irregularity and countermeasure. In this paper, the response variation for dominant frequency and vibration energy by trackbed structure and material stiffness are investigated. The analysis section is two layered ground structure that is comprised of trackbed and soft rock. This structure amplifies the energy of dominant range easily. It is evaluated to affect track irregularity on comparing by theoritical, analytical and empirical method for dynamic response of the trackbed.

A Study on the Track Irregularity Index for the Estimation of Track Quality (궤도품질평가를 위한 궤도틀림 지표에 대한 연구)

  • 오지택;한승용
    • Proceedings of the KSR Conference
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    • pp.450-457
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    • 2000
  • This paper establishes a scheme to estimate track quality using standard deviation and deterioration rate of track irregularities. To provide index of quality, standard deviation and deterioration rate of track irregularities are analyed. As an index, standard deviation and deterioration rate were applied to decision of corrective maintenance and replacement maintenance, respectively. Further, this paper proposes a basic scheme for a modernization of mechanize track maintenance that using MTT(Multiple Tie Tamper) and Ballast Cleaner.

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Development of a Numerical Analysis Method of Train/Track Interaction for Evaluation of Dynamic Track Design Load (궤도 설계 동하중 산정을 위한 차량/궤도 상호작용 해석기법 개발)

  • 양신추
    • Proceedings of the KSR Conference
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    • pp.1094-1099
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    • 2002
  • In this paper, a numerical method for vehicle-track interaction analysis is developed to evaluate vertical dynamic force subjected to rail surface. A vehicle is modelled by lumped masses system and track by multi layered continuous beam system. The equation of motion of vehicle and track interaction system is derived by considering compatibility condition at the contact points between wheel and rail. The input vibration source is given by the empirical formula of power spectral density of track irregularity, which is suggested by FRA. Using this method, dynamic impact factors with the train speed are evaluated.

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Technical Trend of Track Irregularities Measuring Systems and Its Application (궤도 검측 시스템의 현황과 응용)

  • Kim, Sang-Soo;Kim, Young-Mo;Han, Young-Jea;Park, Choon-Su
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.139-142
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    • 2005
  • High speed railway, KTX has started commercial service last you and passengers is increasing. To secure the safety and reliability of high speed railway, it is necessary to inspect and maintain the rail regularities. Several methods of measuring track irregularities are developed in other railway advanced countries. In this paper, we introduce foreign track Inspection methods and application scheme to Koreans.

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