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Room acoustic simulations using the finite element method and diffuse absorption coefficients

Room acoustic simulations using the finite element method and diffuse absorption coefficients
Room acoustic simulations using the finite element method and diffuse absorption coefficients

An alternative approach based on the use of reverberation time measurements to characterize the boundary conditions on Finite Element room acoustic simulations is proposed. The methodology relies on the estimation of the mean absorption of the room using Sabine/Eyring reverberation equations. From this information, diffuse absorption coefficients are calibrated and the specific acoustic impedance of the absorbing surfaces is calculated. The implications of assuming that the specific acoustic impedance is entirely resistive are also considered. An analysis of the accuracy of the proposed approach is presented for a reference case. The results indicate that the suggested methodology leads to a more accurate prediction of the modal behaviour of the enclosures compared to geometrical acoustic simulations. However, the assumption of a purely resistive specific acoustic impedance leads to shift in frequency which can be compensated for by synthesizing complex impedance phases that provides the same diffuse absorption coefficients.

1610-1928
231-239
Murillo, Diego M.
6b5a9093-ca3b-435b-ade3-73e324b1a4e0
Fazi, Filippo M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Astley, Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Murillo, Diego M.
6b5a9093-ca3b-435b-ade3-73e324b1a4e0
Fazi, Filippo M.
e5aefc08-ab45-47c1-ad69-c3f12d07d807
Astley, Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893

Murillo, Diego M., Fazi, Filippo M. and Astley, Jeremy (2019) Room acoustic simulations using the finite element method and diffuse absorption coefficients. Acta Acustica united with Acustica, 105 (1), 231-239. (doi:10.3813/AAA.919304).

Record type: Article

Abstract

An alternative approach based on the use of reverberation time measurements to characterize the boundary conditions on Finite Element room acoustic simulations is proposed. The methodology relies on the estimation of the mean absorption of the room using Sabine/Eyring reverberation equations. From this information, diffuse absorption coefficients are calibrated and the specific acoustic impedance of the absorbing surfaces is calculated. The implications of assuming that the specific acoustic impedance is entirely resistive are also considered. An analysis of the accuracy of the proposed approach is presented for a reference case. The results indicate that the suggested methodology leads to a more accurate prediction of the modal behaviour of the enclosures compared to geometrical acoustic simulations. However, the assumption of a purely resistive specific acoustic impedance leads to shift in frequency which can be compensated for by synthesizing complex impedance phases that provides the same diffuse absorption coefficients.

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Murillo_et_al_Room Acoustic Simulations Using FEM and Diffuse Absorption Coefficients - Version of Record
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Accepted/In Press date: 10 November 2018
e-pub ahead of print date: 1 January 2019

Identifiers

Local EPrints ID: 429887
URI: https://eprints.soton.ac.uk/id/eprint/429887
ISSN: 1610-1928
PURE UUID: fb1539ed-2519-401e-8251-2738988cf983

Catalogue record

Date deposited: 08 Apr 2019 16:30
Last modified: 08 Apr 2019 16:30

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