Influence of the Fastening Modeling on the Vehicle Track Interaction at Singular Rail Surface DefectsSource: Journal of Computational and Nonlinear Dynamics:;2014:;volume( 009 ):;issue: 003::page 31002DOI: 10.1115/1.4025895Publisher: 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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contributor author | Zhao, Xin | |
contributor author | Li, Zili | |
contributor author | Dollevoet, Rolf | |
date accessioned | 2017-05-09T01:05:55Z | |
date available | 2017-05-09T01:05:55Z | |
date issued | 2014 | |
identifier issn | 1555-1415 | |
identifier other | cnd_009_03_031002.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/154169 | |
description 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. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Influence of the Fastening Modeling on the Vehicle Track Interaction at Singular Rail Surface Defects | |
type | Journal Paper | |
journal volume | 9 | |
journal issue | 3 | |
journal title | Journal of Computational and Nonlinear Dynamics | |
identifier doi | 10.1115/1.4025895 | |
journal fristpage | 31002 | |
journal lastpage | 31002 | |
identifier eissn | 1555-1423 | |
tree | Journal of Computational and Nonlinear Dynamics:;2014:;volume( 009 ):;issue: 003 | |
contenttype | Fulltext |