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Testing and Modelling of Elastomeric Element for an Embedded Rail System

Modelling of elastomeric elements of railway components, able to represent stiffness and damping characteristics in a wide frequency range, is fundamental for simulating the train–track dynamic interaction, covering issues such as rail deflection as well as transmitted forces and higher frequency ph...

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Autores principales: Li, Qianqian, Corradi, Roberto, Di Gialleonardo, Egidio, Bionda, Stefano, Collina, Andrea
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621680/
https://www.ncbi.nlm.nih.gov/pubmed/34832369
http://dx.doi.org/10.3390/ma14226968
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author Li, Qianqian
Corradi, Roberto
Di Gialleonardo, Egidio
Bionda, Stefano
Collina, Andrea
author_facet Li, Qianqian
Corradi, Roberto
Di Gialleonardo, Egidio
Bionda, Stefano
Collina, Andrea
author_sort Li, Qianqian
collection PubMed
description Modelling of elastomeric elements of railway components, able to represent stiffness and damping characteristics in a wide frequency range, is fundamental for simulating the train–track dynamic interaction, covering issues such as rail deflection as well as transmitted forces and higher frequency phenomena such as short pitch corrugation. In this paper, a modified non-linear Zener model is adopted to represent the dependences of stiffness and damping of the rail fastening, made of elastomeric material, of a reference Embedded Rail System (ERS) on the static preload and frequency of its deformation. In order to obtain a reliable model, a proper laboratory test set-up is built, considering sensitivity and frequency response issues. The equivalent stiffness and damping of the elastomeric element are experimentally characterised with force-controlled mono-harmonic tests at different frequencies and under various static preloads. The parameters of the non-linear Zener model are identified by the experimental equivalent stiffness and damping. The identified model correctly reproduces the frequency- and preload-dependent dynamic properties of the elastomeric material. The model is verified to be able to predict the dynamic behaviour of the elastomeric element through the comparison between the numerically simulated and the experimentally measured reaction force to a given deformation time history. Time domain simulations with the model of the reference ERS demonstrate that the modelled frequency- and preload-dependent stiffness and damping of the elastomeric material make a clear difference in the transient and steady-state response of the system when distant frequency contributions are involved.
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spelling pubmed-86216802021-11-27 Testing and Modelling of Elastomeric Element for an Embedded Rail System Li, Qianqian Corradi, Roberto Di Gialleonardo, Egidio Bionda, Stefano Collina, Andrea Materials (Basel) Article Modelling of elastomeric elements of railway components, able to represent stiffness and damping characteristics in a wide frequency range, is fundamental for simulating the train–track dynamic interaction, covering issues such as rail deflection as well as transmitted forces and higher frequency phenomena such as short pitch corrugation. In this paper, a modified non-linear Zener model is adopted to represent the dependences of stiffness and damping of the rail fastening, made of elastomeric material, of a reference Embedded Rail System (ERS) on the static preload and frequency of its deformation. In order to obtain a reliable model, a proper laboratory test set-up is built, considering sensitivity and frequency response issues. The equivalent stiffness and damping of the elastomeric element are experimentally characterised with force-controlled mono-harmonic tests at different frequencies and under various static preloads. The parameters of the non-linear Zener model are identified by the experimental equivalent stiffness and damping. The identified model correctly reproduces the frequency- and preload-dependent dynamic properties of the elastomeric material. The model is verified to be able to predict the dynamic behaviour of the elastomeric element through the comparison between the numerically simulated and the experimentally measured reaction force to a given deformation time history. Time domain simulations with the model of the reference ERS demonstrate that the modelled frequency- and preload-dependent stiffness and damping of the elastomeric material make a clear difference in the transient and steady-state response of the system when distant frequency contributions are involved. MDPI 2021-11-18 /pmc/articles/PMC8621680/ /pubmed/34832369 http://dx.doi.org/10.3390/ma14226968 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Qianqian
Corradi, Roberto
Di Gialleonardo, Egidio
Bionda, Stefano
Collina, Andrea
Testing and Modelling of Elastomeric Element for an Embedded Rail System
title Testing and Modelling of Elastomeric Element for an Embedded Rail System
title_full Testing and Modelling of Elastomeric Element for an Embedded Rail System
title_fullStr Testing and Modelling of Elastomeric Element for an Embedded Rail System
title_full_unstemmed Testing and Modelling of Elastomeric Element for an Embedded Rail System
title_short Testing and Modelling of Elastomeric Element for an Embedded Rail System
title_sort testing and modelling of elastomeric element for an embedded rail system
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8621680/
https://www.ncbi.nlm.nih.gov/pubmed/34832369
http://dx.doi.org/10.3390/ma14226968
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