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research-article

Prediction of vibrations and re-radiated noise due to railway traffic. A comprehensive model based on a FEM-MFS approach

[+] Author and Article Information
Aires Colaço

Construct-FEUP, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
aires@fe.up.pt

Pedro Alves Costa

Construct-FEUP, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
pacosta@fe.up.pt

Paulo Amado-Mendes

ISISE, Dep. Civil Engineering, University of Coimbra, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
pamendes@dec.uc.pt

Luis Godinho

ISISE, Dep. Civil Engineering, University of Coimbra, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
lgodinho@dec.uc.pt

1Corresponding author.

ASME doi:10.1115/1.4036929 History: Received March 10, 2017; Revised May 16, 2017

Abstract

The growing of railway infrastructures in urban environments demands accurate methods to predict and mitigate potential annoyance of the inhabitants of the surrounding buildings. The present paper aims to contribute to the goal by proposing a numerical model to predict vibrations and re-radiated noise due to railway traffic. The model is based on a substructuring approach, where the whole propagation media are considered, from the vibration source (the vehicle-track interaction) to the receiver (the building and its interior acoustic environment). The system track-ground-building is simulated by a 2.5D FEM-PML model, formulated in the frequency-wavenumber domain. The re-radiated noise assessment is based on a 2.5D FEM-MFS model, where the FEM is used to obtain the structural dynamic response. The structural displacements computed are used as the vibration input for the Method of Fundamental Solutions (MFS) model in order to assess the acoustic response inside the building's compartments. An application example is presented to assess vibrations and re-radiated noise levels inside the building due to railway traffic. This is then followed by a discussion about the potential benefits of the introduction of floating-slab track systems.

Copyright (c) 2017 by ASME
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