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.
Fichier principal
ICA_2022_template_extended_ABS-0089.pdf (914.91 Ko)
Télécharger le fichier
ABS-0089_Pres_Goestchel.pdf (10.28 Mo)
Télécharger le fichier
Origine | Fichiers produits par l'(les) auteur(s) |
---|