Development of Flexible Track Models for Railway Vehicle Dynamics Applications

J. Costa, P. Antunes, H. Magalhães, J. Ambrosio, Joao Pombo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Railway dynamics is a multidisciplinary area that involves several fields of research. From a mechanical point of view, the aim is to study the dynamic behaviour of the rail vehicle. In this case, detailed vehicle modelling methodologies are used, generally using the multibody system formulation, while the track is generally considered as a rigid structure or modelled considering that the rails sit on an elastic foundation. On the other hand, from a civil or geotechnical engineering point of view, the purpose is to study the track behaviour in detail. In such case, detailed track models are used considering the rails, pads, sleepers, ballast and subgrade, whereas the vehicle is generally represented by vertical moving loads of constant magnitude. The problem of the railway vehicle dynamics is that the track exhibits flexibility, which has implications on the vehicle's performance and should not be disregarded. In order to give answers to the demands for more accurate and efficient vehicle-track interaction models, a finite element formulation is proposed here to represent the track in which the rails and sleepers are supported in a discrete manner by springs and dampers that represent the physical properties of the track components. For this purpose, a computational tool is developed to build flexible track models in an automatic way. It receives as input the spatial geometry of the track and the properties of the track components. The methodology is fully generic, enabling the consideration of any track geometry and any track characteristics, such as ballast, slab or asphalt tracks. Furthermore, the flexible track models are fully compatible with the multibody tools used to study detailed vehicle models and are numerically efficient, enabling vehicle-track interactions studies along large lengths. The proposed methodology is demonstrated here in realistic operation scenarios and the results are compared with the ones obtained with the conventional approach, i.e., using vertical moving loads representing the vehicle loads.

Original languageEnglish
Title of host publicationProceedings of the Third International Conference on Railway Technology
Subtitle of host publicationResearch, Development and Maintenance
EditorsJ. Pombo
PublisherCivil-Comp Press
ISBN (Print)9781905088652
DOIs
Publication statusPublished - 2016
Event3rd International Conference on Railway Technology: Research, Development and Maintenance 2016 - Cagliari, Italy
Duration: 5 Apr 20168 Apr 2016

Publication series

NameCivil-Comp Proceedings
PublisherCivil-Comp Press
Volume110
ISSN (Print)1759-3433

Conference

Conference3rd International Conference on Railway Technology
CountryItaly
CityCagliari
Period5/04/168/04/16

Keywords

  • Contact forces
  • Finite element methodology
  • Realistic track modelling
  • Track behaviour
  • Vehicle-track interaction

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Civil and Structural Engineering
  • Artificial Intelligence
  • Environmental Engineering

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  • Cite this

    Costa, J., Antunes, P., Magalhães, H., Ambrosio, J., & Pombo, J. (2016). Development of Flexible Track Models for Railway Vehicle Dynamics Applications. In J. Pombo (Ed.), Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance [Paper 98] (Civil-Comp Proceedings; Vol. 110). Civil-Comp Press. https://doi.org/10.4203/ccp.110.98