An Empirical Diffusion Model for Acoustic Prediction in Rooms with Mixed Diffuse and Specular Reflections
| Autor: | Alexis Billon, Judicaël Picaut, Cédric Foy, Anas Sakout, Vincent Valeau |
|---|---|
| Přispěvatelé: | CEBPT SOLEN, Laboratoire d'Etudes Aérodynamiques (LEA), Centre National de la Recherche Scientifique (CNRS)-ENSMA-Université de Poitiers, Université de Liège, Division Entretien, Sécurité et Acoustique des Routes (LCPC/ESAR), Laboratoire Central des Ponts et Chaussées (LCPC)-PRES Université Nantes Angers Le Mans (UNAM), Laboratoire d'Étude des Phénomènes de Transfert et de l'Instantanéité : Agro-industrie et Bâtiment (LEPTIAB), Université de La Rochelle (ULR) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Acoustics and Ultrasonics
Scattering coefficient Iterative method 01 natural sciences MODELE 03 medical and health sciences 0302 clinical medicine Optics DISPERSION 0103 physical sciences Specular reflection 030223 otorhinolaryngology Sound pressure 010301 acoustics Physics [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] business.industry Scattering Mechanics Fick's laws of diffusion DIFFUSION [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] Diffusion process ACOUSTIQUE business Scale model Music |
| Zdroj: | Acta Acustica united with Acustica Acta Acustica united with Acustica, Hirzel Verlag, 2009, 95 (1), pp 97-105. ⟨10.3813/AAA.918131⟩ |
| ISSN: | 1610-1928 1861-9959 |
| Popis: | In this paper, a modification to the room-acoustic diffusion model is proposed to take different amounts of wall scattering into account. An extensive set of numerical simulations using a cone-tracing software has first been carried out, in order to highlight the impact of the scattering coefficient on the diffusion process in rooms, in terms of sound pressure levels. An iterative method is then proposed to identify, for a given value of the wall's scattering coefficient, the diffusion constant that allows the stationary sound field to be governed by a diffusion process, regardless of the room's geometry. Using this method, an empirical law can be proposed between the diffusion constant and the scattering coefficient. The empirical diffusion model is then compared to scale model experiments, as well as to other models from the literature, with a satisfactory agreement for the sound pressure level. However, the empirical diffusion model fails to predict the sound decay for rooms with perfectly specularly reflecting surfaces, due to the inherent concept of a diffusion process. |
| Databáze: | OpenAIRE |
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