3D hybrid method for assessing re-radiated noise induced by railway traffic: numerical validation

Abstract

In this study, a novel 3D hybrid methodology for assessing re-radiated noise induced by railway traffic is presented. This method combines numerical modelling techniques with experimental measurements to provide a comprehensive evaluation. Instead of fully modelling the train-track-ground system, the proposed methodology offers an innovative approach to accurately quantify, in a first step, the elastodynamic response of the building in the form of vibrations. Then, the structural velocities are used as input for a model based on the Method of Fundamental Solutions (MFS), enabling the assessment of the acoustic response inside the building’s compartments. The ground-breaking aspect of the presented methodology lies in its ability to compute the dynamic response of the system without requiring any detailed information regarding the geometric or material properties of the track, rolling stock, and ground condition across the propagation path. The validation of this approach is achieved through a rigorous comparison between the results obtained using the hybrid method and those from a reference fully theoretical model of the system. The proposed hybrid methodology overcomes some of the limitations of traditional empirical models and offers a higher level of accuracy and flexibility in predicting railway-induced ground-borne noise

This work was financially supported by: • Base Funding - UIDB/04708/2020 and Programmatic Funding - UIDP/04708/2020 of the CONSTRUCT Instituto de I&D em Estruturas e Construçõoes – funded by national funds through the FCT/MCTES (PIDDAC); • Project PTDC/ECI-EGC/3352/2021, funded by national funds through FCT/ MCTES; • European Union’s Horizon 2020 Programme Research and Innovation action under Grant Agreement No 101012456 – In2Track3; • Individual Grant no. SFRH/BD/148276/2019, provided by FCT; • Individual Grant no. 2022.00898. CEECIND (Scientific Employment Stimulus - 5th Edition) provided by FCT; • Project WIBWAY: Web-based computational tool for the assessment of VIBrations induced by railWAY traffic, with grant reference PDC2022-133093-I00, funded by Agencia Estatal de Investigacíon (Spain) - Proyectos de Prueba de Concepto 2022

Postprint (published version)