• Title, Summary, Keyword: Rail Stability

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Nonlinear aerostatic stability analysis of Hutong cable-stayed rail-cum-road bridge

  • Xu, Man;Guo, Weiwei;Xia, He;Li, Kebing
    • Wind and Structures
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    • v.23 no.6
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    • pp.485-503
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    • 2016
  • To investigate the nonlinear aerostatic stability of the Hutong cable-stayed rail-cum-road bridge with ultra-kilometer main span, a FEM bridge model is established. The tri-component wind loads and geometric nonlinearity are taken into consideration and discussed for the influence of nonlinear parameters and factors on bridge resistant capacity of aerostatic instability. The results show that the effect of initial wind attack-angle is significant for the aerostatic stability analysis of the bridge. The geometric nonlinearities of the bridge are of considerable importance in the analysis, especially the effect of cable sag. The instable mechanism of the Hutong Bridge with a steel truss girder is the spatial combination of vertical bending and torsion with large lateral bending displacement. The design wind velocity is much lower than the static instability wind velocity, and the structural aerostatic resistance capacity can meet the requirement.

The Reliability Design Method According to the Experimental Study of Components and Materials of Railway Rail Fastening System (철도용 레일체결장치 부품.소재의 실험적 연구를 통한 신뢰성 설계 방안)

  • Kim, Hyo-San;Park, Joon-Hyung;Kim, Myung-Ryule;Park, Kwang-Hwa;Lee, Dal-Jae
    • Proceedings of the KSR Conference
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    • pp.2090-2100
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    • 2011
  • Railway rail fastening system is the critical device which gives big influences to not only the vehicle driving stability and the orbit's structural stability against the impulsive load, but also the noise vibration and the ride comfort. As a part of the low-carbon green growth, the importance of the railroad industry is getting highlights on its excellent energy-efficiency and eco-friendliness. However, so far the Korea's domestic rail fastening system technology is not so good and the technical reliance to abroad is very heavy. In this study, we conducted comparative analysis on the rail fastening system with new and used one of the same type. And those systems are imported by Seoul Metro and are being used by it. With this basis, we developed the components and the materials and then, established the durability assessment methods appropriate to the Korean domestic circumstances. And through the reliability qualification test on the 7 parts of the rail fastening system, we've improved the reliability and guaranteed the 15 years of service lifetime. ($B_{10}Life15$) Establishment and standardization of Reliability Standard on the parts of the rail fastening system such as anti-vibration pads, guide-plate, screw spike made it possible to perform the internationally fair assessment. And it is thought that we can satisfy the manufactures' and consumers' needs of cost-cutting and qualification security by shortening of assessment period on rail fastening system.

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Dynamics of an AGT System Light Rail Transit with Rubber Tires (고무차륜 AGT시스템 경전철의 동특성 해석)

  • 전광식;이우식;윤성호
    • Proceedings of the KSR Conference
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    • pp.135-142
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    • 1999
  • This paper deals with dynamic characteristics of automated guideway transit vehicle with rubber tires. Several models for guideway system of LRT(Light Rail Transit) have been Proposed because of the necessity of guideway system for LRT with rubber tires on exclusive rail unlike steel tires. Here, steering system and bogie system are investigated to compare with dynamic characteristics. On selecting guideway system, the way of vehicle operation should be considered and simultaneously the dynamic characteristics of the vehicle must be evaluated with respect to each guideway. The results show that stability is essential for vehicle with steering system, and that single-axle bogie system gives the good stability, though it is necessary to reduce the guide-wheel force

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Suspension Characteristics Design and Stability Analysis for an Articulated Bogie Type of Light Rail Vehicle (관절형 경량전철의 현가특성 설계 및 안정성 해석)

  • Hur, S.;Park, C.K.;Ha, S.D.;Han, H.S.
    • Proceedings of the KSR Conference
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    • pp.540-547
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    • 1998
  • light rail vehicle is modeled as a 2 d. o. f linear system for the design of vertical suspension characteristics and a 4 d. o. f. linear system for the design of lateral suspension characteristics. FRA's class-5-track irregularity is used for the exciting disturbance on track. Suspension stiffness and damping is selected on the basis of the ride quality and suspension stroke trade-off for the bogie of light rail vehicle. The optimum value of primary and secondary suspension characteristics is determined. And the stability of full vehicle model for the LRV is analyzed using the VAMPIRE program and critical speed is determined.

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Analysis of Dynamic Behavior for Design Review of the Korean High Speed Prototype Test Train (한국형 고속전철 시제차량 설계검증을 위한 동특성 해석)

  • ;;Johannes Picht
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1232-1240
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    • 2001
  • In this study. a computer simulation of the Korean High Speed Prototype Test Train was performed to investigate the dynamic behavior(running stability. safety and comfort) in detail design process. The simulation model which was prepared by ADAMS/Rail V10.l consists of power car and middle car assembly (2 motorized cars + 3 trailer cars). The nonlinear analysis takes into account the full vehicle model including wheel/rail contact and the influence of disturbed track. Throughout the dynamic calculation of KHST on the straight and the curved track. accelerations in car body. ride comforts and wheel rail forces were investigated.

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Development of Rail-transport Operation Control in Consideration of the Stability Variation of Railway Embankment under Rainfall (강우시 사면안전성 변화를 고려한 열차운전규제 개발)

  • 신민호;김현기;김정기
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.13-22
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    • 2003
  • Train speed and infiltration of rainfall causes railway embankment to be unstable and may result in failure. Therefore, the variation in the safety factor of railway embankment should be analyzed as the function of rainfall intensity, rainfall duration, and train speed and the study is accomplished using numerical analysis program. Based on unsaturated soil engineering, the variables in the shear strength function and permeability function are also defined and used for the numerical model for evaluation of railway embankments under rainfall. As a result of the study, in order to secure the safety of train under rainfall, the variation in the safety factor of railway embankment is predicted as the function of rainfall intensity, duration time and the train load as a function of train speed. It is possible to ensure the safety of train under rainfall. Thereafter, the feasibility of the rail-transport operation control with engineering basis was established.

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A Study on the Application on Site and Stability of Broken Rail Detection Equipment (레일절손검지장치 현장적용 및 안정화에 관한 연구)

  • Choi, Si-Haeng;Cha, Gwan-Bong;Lee, Jong-Seong;Chung, Su-Young;Lee, Hi-Sung
    • Proceedings of the KSR Conference
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    • pp.2082-2089
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    • 2011
  • This study is examination of application on site for performance and stability of real-time broken rail detection equipment development system about connection, welded part occurring data errors of broken rail monitoring system. As a result of analysis about data collected in Seoul Metro No.2 Subway from Mar. 2010 to Jan. 2011, we found it is possible to detect crack location(Thermit welding) within the margin of error of ${\pm}1m$ accurately as the first attenuation was -1.2dB and the second was -1.3dB.

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Influence Factors Affecting the Longitudinal Force of Continuous Welded Rail on Railroad Bridges (장대레일 철도 교량의 축력 영향인자 분석)

  • Kim Kyung Sam;Han Sang Yun;Lim Nam Hyoung;Kang Young Jong
    • Proceedings of the KSR Conference
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    • pp.385-390
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    • 2003
  • Recently, use of Continuous Welded rail(CWR) is increased for structural, economical reason but new problem is caused accordingly and phenomenon that give threat in traveling by ship stability of train is led. According as rail is prolonged, excessive relative displacement and longitudinal force can happen to rail by temperature change and external force. Specially, buckling or fracture of rail can happen in railroad bridges because relative displacement by bridge and properties of matter difference between rail grows and additional axial force happens to rail by behavior of bridge. According to several study, longitudinal force of rail in bridge is influenced with ballast resistance, elongation length, boundary condition, stiffness of framework. Non-linear behavior of ballast acts by the most important factor in interaction between rail and bridge. Therefore, must consider stiffness of bridge construction with non-linear characteristic of ballast and stiffness of base for accuracy with longitudinal force calculation and analyze. In this study, perform material non-linear analysis for longitudinal force of CWR and three dimensional buckling analysis to decide buckling force.

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A Structural Analysis on the Light Rail Vehicle Body with Composite Material (복합재료 경전철의 차체구조 해석)

  • 이영신;김재훈;이호철;길기남;박병준
    • Proceedings of the KSR Conference
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    • pp.437-446
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    • 1999
  • The structural behavior of the composite material light rail vehicle body are investigated. Composite material is very useful for light rail vehicle structure due to its high specific strength and lightweight characteristics. The main carbody is made of aluminum alloy. The side wall and roof with composite panels can reduce total vehicle weight about 2000kg. In addition, with the lower density of the foam, enhances lightness in the panel and to save the operation expenses. The finite element analysis code, ANSYS is used to evaluate the stability of the body structure under the various load conditions.

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Parametric Study about Measuring Train Loads (열차하중 측정에 관한 매개변수 연구)

  • Lee So-Jin;Oh Ji-Taek;Park Ok-Jeoung
    • Proceedings of the KSR Conference
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    • pp.1148-1154
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    • 2004
  • Parametric studies are executed by numerical method varying then number of strain gauges, rail section and distance of sleeper from which the followings are obtained. Wheel forces or lateral forces are measured by connecting eight strain gauges on rail to single Wheatstone bridge. The method eliminates the influence of interaction and measured stability. Strain gauges are fastened on the neutral axis of the rail so as not to be influenced by sleeper.

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