• 제목, 요약, 키워드: Vehicle-track interaction

검색결과 83건 처리시간 0.185초

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

  • 양신추
    • 한국철도학회:학술대회논문집
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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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직결궤도 체결구 하부에 발생한 단차가 차량/궤도 상호작용에 미치는 영향 (The Effect of Gaps in Concrete Bearing Surface of Direct Fixation Track on Vehicle and Track Interaction)

  • 양신추;김은
    • 한국철도학회:학술대회논문집
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    • pp.50-57
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    • 2010
  • Various installation faults may lie in fasteners in the construction of a direct-fixation track by the top-down method. At an extreme, they may cause excessive interaction between the train and track, compromise the running safety of the train, and cause damage to the track components. Therefore, the faults need to be kept within the allowable level through an investigation of their effects on the interactions between the train and track. In this study, the vertical dynamic stiffness of fasteners in installation faults was measured based on the dynamic stiffness test by means of an experimental apparatus that was devised to feasibly reproduce gap faults. This study proposes an effective analytical model for a train-track interaction system in which most elements, except the nonlinear wheel-rail contact and some components that behave bi-linearly, exhibit linear behavior. To investigate the effect of the behavior of fasteners in gap faults in a direct-fixation track on the vehicle and track, vehicle-track interaction analyses were carried out, targeting key review parameters such as the wheel load reduction factor, vertical rail displacement, rail bending stress, and mean stress of the elastomer. From the results, it was noted that the gap faults in the concrete bearing surface of a direct-fixation track need to be limited for the sake of the long-term durability of the elastomer than for the running safety of the train or the structural safety of the track.

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설계차량하중 변화에 따른 교량상 장대레일 궤도의 부가축응력 (Additional Axial Stress of CWR Track on the Bridge according to the Variation of Design Vehicle Load)

  • 윤경민;전병흔;최신형;임남형
    • 한국산학기술학회논문지
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    • v.16 no.1
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    • pp.807-813
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    • 2015
  • 교량상의 장대레일은 궤도-교량상호작용에 의해 토노반상의 장대레일에 비해 복잡한 거동을 보인다. 궤도-교량 상호작용에 영향을 미치는 요인은 온도변화와 차량하중이다. 국내 철도설계지침 KR C-08080에서는 해석 시 사용하는 물성치, 모델링 방법, 하중 및 하중 조합 방법 등에 대하여 제시하고 있다. 2014년에 KR C-08080에서 제시된 차량하중이 변경되었다. 본 연구에서는 변경된 차량하중의 영향을 평가하기 위하여 22개 교량에 대한 궤도-교량 상호작용 유한요소 해석을 수행하였다.

Vehicle/track dynamic interaction considering developed railway substructure models

  • Mosayebi, Seyed-Ali;Zakeri, Jabbar-Ali;Esmaeili, Morteza
    • Structural Engineering and Mechanics
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    • v.61 no.6
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    • pp.775-784
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    • 2017
  • This study is devoted to developing many new substructure models for ballasted railway track by using the pyramid model philosophy. As the effect of railway embankment has been less considered in the previous studies in the field of vehicle/track interaction, so the present study develops the pyramid models in the presence of railway embankment and implements them in vehicle/track interaction dynamic analyses. Considering a moving car body as multi bodies with 10 degrees of freedom and the ballasted track including rail, sleeper, ballast, subgrade and embankment, two categories of numerical analyses are performed by considering the new substructure systems including type A (initiation of stress overlap areas in adjacent sleepers from the ballast layer) or type B (initiation of stress overlap areas in adjacent sleepers from the subgrade layer). A comprehensive sensitivity analyses are performed on effective parameters such as ballast height, sleepers spacing and sleeper width. The results indicate that the stiffness of subgrade, embankment and foundation increased by increasing the ballast height. Also, by increasing the ballast height, rail and ballast vertical displacement decreased.

궤도차량과 토양의 상호관계에 대한 연구 (Study of the Interaction between a Tracked Vehicle and the terrain)

  • 박천서;이승종
    • 한국정밀공학회:학술대회논문집
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    • pp.144-147
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    • 2001
  • The planar tracked vehicle model used in this investigation consists of two kinematically decoupled subsystem, i.e., the chassis subsystem and the track subsystem. The chassis subsystem include the chassis frame, sprocket, idler and rollers, while the track subsystem is represented as a closed kinematic chain consisting of rigid links interconnected by revolute joints, In this paper, the recursive kinematic and dynamic formulation of the tracked vehicle is used to find the vertical forces and the distances of the certain track moved in the driving direction along the track. These distances and vertical forces obtained are used to calculate the sinkage of a terrain. The FEM is adopted to analyze the interaction between the tracked vehicle and terrain. The terrain is represented by a system of elements with specified constitutive relationships and considered as a piecewise linear elastic, plastic and isotropic material. When the tracked vehicle is moving with different speeds on the terrain, the elastic and plastic deformations and the maximum sinkage for the four different types of a isotropic soil are simulated.

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레일패드의 강성이 자갈궤도 침하에 미치는 영향 연구 (A study on the Settlement of Ballasted Track according to Various Rail-Pad Stiffness)

  • 최진유;김은;황만호;조수익
    • 한국철도학회:학술대회논문집
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    • pp.249-255
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    • 2010
  • Ballasted track is under the circumstance of repetition of deterioration and recovery. Track deterioration is presented as track irregularity or settlement, and dynamic force subjected to track is one of major cause of the deterioration. The dynamic force is determined from the dynamic interaction between track and vehicle. Rail-pad stiffness is one of the factor affects track dynamic property. In this study, the relationship between rail-pad stiffness and track settlement was investigated. Dynamic forces according to various rail-pad stiffness was obtained from the dynamic vehicle-track interaction analysis using DARTS-NL. Track settlement was calculated by substitution the dynamic forces into various formulas for track settlement. From the result of analysis, it was known that the track settlement is increased about 6% when the rail-pad stiffness rise about twice. And this result leads that there is only a little relationship between rail-pad stiffness and track settlement.

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Dynamics of high-speed train in crosswinds based on an air-train-track interaction model

  • Zhai, Wanming;Yang, Jizhong;Li, Zhen;Han, Haiyan
    • Wind and Structures
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    • v.20 no.2
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    • pp.143-168
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    • 2015
  • A numerical model for analyzing air-train-track interaction is proposed to investigate the dynamic behavior of a high-speed train running on a track in crosswinds. The model is composed of a train-track interaction model and a train-air interaction model. The train-track interaction model is built on the basis of the vehicle-track coupled dynamics theory. The train-air interaction model is developed based on the train aerodynamics, in which the Arbitrary Lagrangian-Eulerian (ALE) method is employed to deal with the dynamic boundary between the train and the air. Based on the air-train-track model, characteristics of flow structure around a high-speed train are described and the dynamic behavior of the high-speed train running on track in crosswinds is investigated. Results show that the dynamic indices of the head car are larger than those of other cars in crosswinds. From the viewpoint of dynamic safety evaluation, the running safety of the train in crosswinds is basically controlled by the head car. Compared with the generally used assessment indices of running safety such as the derailment coefficient and the wheel-load reduction ratio, the overturning coefficient will overestimate the running safety of a train on a track under crosswind condition. It is suggested to use the wheel-load reduction ratio and the lateral wheel-rail force as the dominant safety assessment indices when high-speed trains run in crosswinds.

궤도차량과 토양의 상호작용에 대한 연구 (Study of the Interaction between Tracked Vehicle and Terrain)

  • 박천서;이승종
    • 한국정밀공학회지
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    • v.19 no.2
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    • pp.140-150
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    • 2002
  • The planar tracked vehicle model used in this investigation consists of two kinematically decoupled subsystems, i.e., the chassis subsystem and the track subsystem. The chassis subsystem includes the chassis frame, sprocket, idler and rollers, while the track subsystem is represented as a closed kinematic chain consisting of rigid links interconnected by revolute joints. In this study, the recursive kinematic and dynamic formulation of the tracked vehicle is used to find the vertical terce and the distance of an arbitrary track moved in the driving direction along the track. These distances and vertical forces obtained are used to get the deformation and sinkage of a terrain. The FEM(Finite Element Method) is adopted to analyze the interaction between tracked vehicle and terrain. The terrain is represented by a system of elements wish specified constitutive relationships and considered as a piecewise linear elastic, plastic and isotropic material. When the tracked vehicle is moving with different speeds on the terrain, the elastic and plastic deformations and the maximum sinkage for the four different types of isotropic soils are simulated.

교량/토공 접속구간 보강레일의 최적설계 (Optimal Design of Reinforced Rail over Connection Section of Bridge and Embankment)

  • 양신추;강윤석;김은
    • 한국철도학회:학술대회논문집
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    • pp.256-263
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    • 2002
  • This paper deal with optimal design of reinforced track as a track reinforcing method for transition area of track support stiffness in transition area between bridge and earthwork. When vehicle passes through transition area, dynamic properties between vehicle and track are studied by the analysis of vehicle-train interaction for the each case when reinforced tracks are used or not. furthermore, optimum decision of type and length of track are made based on the performance adapting variable parameters : support stiffness of track for bridge and earthwork, heading direction of vehicle and type and length of track.

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틸팅열차 주행시 곡선부 궤도에서의 동적상호작용 (Dynamic Interaction Analysis of Tilting Train and Curved Track)

  • 정근영;고태훈
    • 한국철도학회논문집
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    • v.15 no.2
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    • pp.162-171
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    • 2012
  • 본 연구에서는 곡선부를 주행하는 틸팅열차와 궤도와의 동적상호작용을 고려한 동적해석을 수행하기 위한 해석기법을 제시하였다. 본 연구에서는 3차원 차량요소를 이용하여 틸팅열차를 모형화하였으며, 틸팅열차의 곡선부 주행시 차량의 주행방향이 크게 변화하는 상황에서 주행속도 및 원곡선 반경에 상응하는 원심력의 표현, 선로의 캔트량, 차륜-레일의 접촉각 및 열차의 틸팅각 등을 고려한 동적상호작용해석 방법을 제안하였다. 제안된 해석방법은 기본적인 검증예제들에서 만족할만한 결과를 보여주었으며, 실제적인 문제에 적용이 가능할 것으로 기대된다.