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Room Acoustic Simulations Using the Finite Element Method and Diffuse Absorption Coefficients

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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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Document Type: Research Article

Publication date: January 1, 2019

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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