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    Influence of the Fastening Modeling on the Vehicle Track Interaction at Singular Rail Surface Defects

    Source: Journal of Computational and Nonlinear Dynamics:;2014:;volume( 009 ):;issue: 003::page 31002
    Author:
    Zhao, Xin
    ,
    Li, Zili
    ,
    Dollevoet, Rolf
    DOI: 10.1115/1.4025895
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: With up to 12 springdamper groups distributed in the actual area of a rail pad, different fastening models are developed in this paper to include the nonuniform pressure distribution within a fastening system and model the constraints at the rail bottom more realistically for the purpose of high frequency dynamics between vehicle and track. Applied to a 3D transient FE model of the vehicletrack interaction, influence of the fastening modeling on the high frequency dynamic contact forces at singular rail surface defects (SRSDs) is examined. Two defect models, one is relatively large and the other is small, are employed. Such a work is of practical significance because squats, as a kind of SRSD, have become a wide spread problem. Results show that the fastening modeling plays an important role in the high frequency dynamic contact forces at SRSDs. Supports in the middle of the rail bottom, modeled as springdamper groups located under rail web, are found to be most important. The less the rail bottom is constrained or supported, the more isolated the sleepers and substructure are from the wheelrail interaction, and the more kinetic energy is kept in the rail after impact at a SRSD. Rolling speed is also varied to take into account its influence. Finally, based on the results of this work, influence of the service states of the fastening system on growth of relatively small SRSDs is discussed.
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      Influence of the Fastening Modeling on the Vehicle Track Interaction at Singular Rail Surface Defects

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    contributor authorZhao, Xin
    contributor authorLi, Zili
    contributor authorDollevoet, Rolf
    date accessioned2017-05-09T01:05:55Z
    date available2017-05-09T01:05:55Z
    date issued2014
    identifier issn1555-1415
    identifier othercnd_009_03_031002.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/154169
    description abstractWith up to 12 springdamper groups distributed in the actual area of a rail pad, different fastening models are developed in this paper to include the nonuniform pressure distribution within a fastening system and model the constraints at the rail bottom more realistically for the purpose of high frequency dynamics between vehicle and track. Applied to a 3D transient FE model of the vehicletrack interaction, influence of the fastening modeling on the high frequency dynamic contact forces at singular rail surface defects (SRSDs) is examined. Two defect models, one is relatively large and the other is small, are employed. Such a work is of practical significance because squats, as a kind of SRSD, have become a wide spread problem. Results show that the fastening modeling plays an important role in the high frequency dynamic contact forces at SRSDs. Supports in the middle of the rail bottom, modeled as springdamper groups located under rail web, are found to be most important. The less the rail bottom is constrained or supported, the more isolated the sleepers and substructure are from the wheelrail interaction, and the more kinetic energy is kept in the rail after impact at a SRSD. Rolling speed is also varied to take into account its influence. Finally, based on the results of this work, influence of the service states of the fastening system on growth of relatively small SRSDs is discussed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInfluence of the Fastening Modeling on the Vehicle Track Interaction at Singular Rail Surface Defects
    typeJournal Paper
    journal volume9
    journal issue3
    journal titleJournal of Computational and Nonlinear Dynamics
    identifier doi10.1115/1.4025895
    journal fristpage31002
    journal lastpage31002
    identifier eissn1555-1423
    treeJournal of Computational and Nonlinear Dynamics:;2014:;volume( 009 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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