• Title, Summary, Keyword: 궤도틀림

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Technical Trend of Measuring System for Track Inspection (궤도측정을 위한 계측시스템의 기술동향 및 구성방안)

  • Han Young-Jae;Kim Jong-Young;Seo Sung-Il;Kim Seog-Won;Kang Yun-Suk
    • Proceedings of the KIEE Conference
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    • pp.1442-1444
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    • 2004
  • 현재 한국형 고속전철은 시운전 시험 중에 있으며, 차량 내에 상시 계측시스템이 구성되어 있어서 차량의 전기장치 신호나 기계장치 신호를 획득하여 주행 및 제동에 관한 성능 및 특성을 분석하고 파악할 수 있다. 하지만 차량의 안전성, 승객의 승차감 확보와 궤도의 빠른 유지보수를 위해 궤도를 전문적으로 감시하고 검측하는 시스템은 구축되어 있지 않다. 그러므로 고속전철 차량에 설치되어 고속주행 중에 궤도를 종합적이고 효율적으로 측정하는 전문적인 계측시스템을 구성할 필요가 있다. 따라서 궤도틀림의 검측방법과 검측기구 및 그 원리를 이해하고 선진국의 궤도 검측기술을 파악하여 보았다.

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A Study of Analysis Method for the Track geometry measuring data on High Speed Railway (고속철도 궤도검측자료 분석기법에 관한 연구)

  • Kang, Kee Dong
    • Journal of Korean Society of Steel Construction
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    • v.18 no.1
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    • pp.47-51
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    • 2006
  • Measuring the track geometry of a high-speed railway is the most important task in track construction and track maintenance work. Measuring accuracy is particularly sign the formulation of the maintenance plan and in the assessment of the work quality, and because it can set the train speed limit. To determine the track geometry of a high-speed railway, it is important to use KNR's track recording coach (EM-120). According to the result of the spectrum analysis, noise near the 1-m wave band was found on the track recording data. A new filter was thus applied to remove the noise from the track recording data. A similar result can be acquired when this method is used in real track geometry.

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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Parametric Study on Steel composite Girder bridges for HONAM High-Speed Railway Considering Criteria Requirement of Dynamic Response (호남고속철도 동적 안정성 요구 조건을 고려한 강합성 거더교의 변수 연구)

  • Cho, Sun-Kyu;Jung, Han-Ouk;Kim, Sung-Il
    • Proceedings of the KSR Conference
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    • pp.1370-1378
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    • 2007
  • High speed railway bridge is affected on safety of bridge by dynamic amplification effect, when dynamic response of bridge is equal to effect cycle load for rolling stock axle according to high speed operation train. And excessive deformation of structure has negative effect on operation safety of train and comfort of passenger due to fluctuation of wheel load by torsion of track etc. and decrease of contact force on vehicle wheel-rail. To ensure the safety of track and train operation safety, it is have to perform the study on resonance and deformation of structure. That criteria and requirement of railway bridge is limitation of vertical acceleration on deck for dynamic behavior of structure, contact of vehicle wheel and rail, limitation of face distortion and rotation angle of end deck, and limitation of vertical displacement by train. Unlike KYEONGBU High Speed Railway, New constructed HONAM High Speed Railway have to applied the new requirement for dynamic behavior safety according to change of condition which is type of ballast (slab ballast), interval of track, and actual rolling stock load. Therefore, in this paper, it was conformed the dynamic characteristic due to parameter, which related with above mentioned criteria, for steel composite bridges.

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DEVELOPMENT OF THREE-DIMENSIONAL DYNAMIC ANALYSIS MODEL HIGH SPEED TRAIN-BRIDGE INTERACTION (철도 차량 - 교량 상호작용에 의한 3차원 동적 해석 모델 개발)

  • Dinh, Van Nguyen;Kim, Ki Du;Shim, Jae Soo;Choi, Eun Soo;Songsak, Suthasupradit
    • Journal of Korean Society of Steel Construction
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    • v.20 no.1
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    • pp.151-163
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    • 2008
  • A formulation of three-dimensional model of articulated train-b ridge dynamic interaction has been made for the Korean eXpress Train (KTX). Semi-periodic profiles of rail irregularities consisting of elevation, alignment, cross and gauge irregularities have also been proposed using FRA maximum tolerable rail deviations. The effects of rail joints and sleeper step were also included. The resulting system matrices of train and bridge are very spare, and thus, are stored in one-dimensional arrays, yielding a time-efficient solution. A numerical algorithm for computing bridge-train response including an iterative scheme is also formulated. A program simulating train-bridge interaction and solving this problem using the new algorithm is implemented as new modules for the f inite element analysis software named XFINAS. Computed results using the new program are then checked by that of the validated 2-D bridge-train interaction model. This new 3D analysis provides more detailed train responses such as swaying, bouncing, rolling, pitching and yawing accelerations, which are useful inevaluating passenger riding comfort. Train operation safety and derailment could also be directly investigated by relative wheel displacements computed from this program.

A Basic Investigation for reconstruction profile of track irregularities measured by chord method (현 방법으로 검측된 궤도틀림 값의 원형복원에 대한 기초검토)

  • 정우진;안규일
    • Proceedings of the KSR Conference
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    • pp.1086-1093
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    • 2002
  • In Korea mid chord offset method has been used to measure the track irregularities. This method has been also used all over the world widely because of its accessibility and the operational excellence for measured data. But it has been pointed out recently that track irregularities reconstructed from measured data have unexpected noise in the high frequency area as the defect of this way. This study shows the cause of noise which occurs during reconstructing process and mentions the solutions briefly.

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The Effect and Countermeasures of the Vertical Track Settlement Caused by Expand and Contract Behavior of the High-Speed Railway Bridge Girder (고속철도 교량 바닥판의 온도신축작용이 궤도처짐에 미치는 영향과 대책에 관한 연구)

  • Kang, Kee Dong
    • Journal of Korean Society of Steel Construction
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    • v.17 no.6
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    • pp.673-679
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    • 2005
  • According to continuous welded rails on a bridge, temperature changes bring about the expansion of the bridge deck,adding axial forces on the track. Moreover, the ballast on the bridge deck expansion joint is moved due to the bridge deck. The longer the bridge deck is, the greater the influence will be, loosening the ballast, causing track irregularities, and deteriorating passenger comfort. Considering the structure of the bridge itself and tolerance for track irregularities caused by the loosened ballast on the bridge, the maximum length of the deck should be less than 80 m, which is the same as the standard of French railways. In this study, the interaction between the expansion related to the bridge length and the irregularity in the longitudinal level, referring to measurements and maintenance work performed in high-speed railways, was analyzed. This research shows that the installation of a sliding plate or a vertical ballast stopper is not a good option, since it is difficult. On the other hand, the installation of a ZLR fastener or gluing is easy, but its influence is insignificant. In conclusion, switch tie tamping or manual tamping is more effective than other methods of what?

Track-Structure Interaction Analysis of Fast Hardening Track on Railway Bridge Considering Effect of Anchor and Friction (앵커와 마찰의 영향을 고려한 교량상 급속경화궤도의 궤도-교량 상호작용해석)

  • Cho, Sang-Hyeon;Lee, Il-Wha;Chung, Won-Seok;Lee, Hee-Young;Lee, Kyoung-Chan
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.1
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    • pp.53-61
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    • 2018
  • Ballast track requires constant maintenance work due to progress of track irregularity. Fast Hardening Track(FHT) has been developed to reduce the maintenance effort done by injecting fast hardening mortar in aged ballast to convert slab track. For the application of FHT to a railway bridge, post-installed anchors should be placed at center of the track segment to fix it on bridge. This paper presents track-bridge interaction analysis results with FHT considering stiffness and strength of post-installed anchor, age of FHT concrete and friction between FHT and bridge deck surface. Based on the analysis results, this study suggests when is good to install the anchors and allow normal operation of passing train.

A Study on the Reliability of Various Track Recording Data (다양한 궤도틀림 데이터의 신뢰성 검토)

  • Lee, Jee-Ha;Ahn, Sung-Hyuk;Park, Hye-Jong;Kim, Bag-Jin
    • Proceedings of the KSR Conference
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    • pp.435-441
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    • 2011
  • Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies in Korea use various track recording equipments to measure track irregularity. But this various equipments output different data due to their geometrical structure even measured at same location. In this report, the correlation of various track recording data used in Korea was reviewed.

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Probability Distribution of Track Recording Data (궤도틀림 검측 데이타의 확률분포 검토)

  • Lee, Jee-Ha;Na, Sung-Hoon;Kim, Bag-Jin;Lee, You-Bok
    • Proceedings of the KSR Conference
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    • pp.310-314
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    • 2010
  • Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies in Korea use normal distribution as probability distribution of track irregularity. But some countries use non-normal distribution according to their own track recording system. In this report, reviewed probability distribution of Kyung-Bu high-speed line and tested normality.

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