Issue |
Acta Acust.
Volume 7, 2023
|
|
---|---|---|
Article Number | 48 | |
Number of page(s) | 19 | |
Section | Room Acoustics | |
DOI | https://doi.org/10.1051/aacus/2023044 | |
Published online | 18 October 2023 |
Scientific Article
A validated finite element model for room acoustic treatments with edge absorbers
1
Institute of Fundamentals and Theory in Electrical Engineering (IGTE), Graz University of Technology, Inffeldgasse 18/I, 8010 Graz, Austria
2
Signal Processing and Speech Communication Laboratory (SPSC), Graz University of Technology, Inffeldgasse 16c, 8010 Graz, Austria
* Corresponding author: kraxberger@tugraz.at
Received:
15
February
2023
Accepted:
27
August
2023
Porous acoustic absorbers have excellent properties in the low-frequency range when positioned in room edges, therefore they are a common method for reducing low-frequency reverberation. However, standard room acoustic simulation methods such as ray tracing and mirror sources are invalid for low frequencies in general which is a consequence of using geometrical methods, yielding a lack of simulation tools for these so-called edge absorbers. In this article, a validated finite element simulation model is presented, which is able to predict the effect of an edge absorber on the acoustic field. With this model, the interaction mechanisms between room and absorber can be studied by high-resolved acoustic field visualizations in both room and absorber. The finite element model is validated against transfer function data computed from impulse response measurements in a reverberation chamber in style of ISO 354. The absorber made of Basotect® is modeled using the Johnson-Champoux-Allard-Lafarge model, which is fitted to impedance tube measurements using the four-microphone transfer matrix method. It is shown that the finite element simulation model is able to predict the influence of different edge absorber configurations on the measured transfer functions to a high degree of accuracy. The evaluated third-octave band error exhibits deviations of 3.3–4.1 dB computed from third-octave band averaged spectra.
Key words: Edge Absorber / Room Acoustics / Finite Element Method / JCAL-Model / openCFS
© The Author(s), Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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