Article (Scientific journals)
Predictions of the reverberation time in high absorbent room using a modified-diffusion model
Billon, Alexis; Picaut, Judicaël; Sakout, Anas
2008In Applied Acoustics, 69 (1), p. 68-74
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Keywords :
Acoustics; Room acoustics; Diffusion model
Abstract :
[en] A modification of the diffusion model’s boundary condition, based on the Eyring absorption coefficient, to account for high walls absorption is proposed. Numerical comparisons are carried out for three geometrical configurations (a proportionate room, a corridor and a flat enclosure). Comparisons with the statistical theory and a ray-tracing software show that the modified boundary condition increases the accuracy of the diffusion model in term of reverberation time in all the simulated configurations. An experimental comparison in the case of a non-uniformly absorbent room (a reverberation chamber covered with patches of glass wool) is also carried out. The modified-diffusion model results match well with the ray-tracing ones. Both models are in agreement with the experimental data for most of third octave bands (discrepancy close to or below 10%). However, some discrepancies up to 40% can also be observed in a few octave bands, probably due to experimental considerations and to the modal behaviour of the room at low frequencies.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Billon, Alexis ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electroacoustique, acoustique appliquée et éclairage
Picaut, Judicaël
Sakout, Anas
Language :
English
Title :
Predictions of the reverberation time in high absorbent room using a modified-diffusion model
Publication date :
2008
Journal title :
Applied Acoustics
ISSN :
0003-682X
eISSN :
1872-910X
Publisher :
Elsevier Science
Volume :
69
Issue :
1
Pages :
68-74
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ADEME - Agence de l'Environnement et de la Maîtrise de l'Energie [FR]
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since 19 February 2010

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