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Communication Dans Un Congrès Année : 2022

Properties of the transmission line matrix model for outdoor sound propagation: Numerical dispersion effects

Résumé

Time-domain numerical methods are attractive tools for the prediction of outdoor sound propagation as they are able to handle most of the physical phenomena involved in environmental acoustics. The transmission line matrix (TLM) method is considered for modelling sound fields in complex outdoor environments but it remains relatively poorly documented. In this paper, the space-time integration scheme of the method and a stability analysis are provided. The review of the model highlights similarities with a finite difference scheme and leads to a more robust understanding of its link with the wave equation using Taylor expansions. The stability analysis allows the numerical dispersion relation of the model to be formulated and the associated errors to be quantified. Two different numerical experiments are presented to characterize precisely the limitations of the method applied to outdoor sound propagation. To conclude, the results are analyzed, highlighting the effects of the propagation distance and the spectral distribution of the simulated sources.
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Dates et versions

hal-04007605 , version 1 (28-02-2023)

Identifiants

  • HAL Id : hal-04007605 , version 1

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Quentin Goestchel, Gwenaël Guillaume, David Ecotiere, Benoit Gauvreau. Properties of the transmission line matrix model for outdoor sound propagation: Numerical dispersion effects. International congress on acoustics, Oct 2022, Gyeong Ju, South Korea. ⟨hal-04007605⟩

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