A validated finite element model for room acoustic treatments with edge absorbers

IF 1 3区 物理与天体物理 Q4 ACOUSTICS Acta Acustica Pub Date : 2023-01-01 DOI:10.1051/aacus/2023044
Florian Kraxberger, Eric Kurz, Werner Weselak, Gernot Kubin, Manfred Kaltenbacher, Stefan Schoder
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Abstract

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.
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带边缘吸声器的室内声学处理的有限元模型验证
多孔吸声器放置在室内边缘处,在低频范围内具有优异的性能,是降低低频混响的常用方法。然而,标准的室内声学模拟方法,如光线追踪和镜像源,通常对低频无效,这是使用几何方法的结果,导致缺乏对这些所谓的边缘吸收器的模拟工具。本文提出了一个有效的有限元仿真模型,该模型能够预测边缘吸收器对声场的影响。利用该模型,可以通过房间和吸收器的高分辨率声场可视化来研究房间和吸收器之间的相互作用机制。有限元模型与ISO 354混响室脉冲响应测量计算的传递函数数据进行了验证。使用Johnson-Champoux-Allard-Lafarge模型对由basotoect®制成的吸收器进行建模,该模型使用四麦克风传递矩阵方法拟合阻抗管测量。结果表明,有限元模拟模型能够较准确地预测不同边缘吸收结构对所测传递函数的影响。计算得到的三倍频带误差与三倍频带平均光谱的偏差为3.3-4.1 dB。
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来源期刊
Acta Acustica
Acta Acustica ACOUSTICS-
CiteScore
2.80
自引率
21.40%
发文量
0
审稿时长
12 weeks
期刊介绍: Acta Acustica, the Journal of the European Acoustics Association (EAA). After the publication of its Journal Acta Acustica from 1993 to 1995, the EAA published Acta Acustica united with Acustica from 1996 to 2019. From 2020, the EAA decided to publish a journal in full Open Access. See Article Processing charges. Acta Acustica reports on original scientific research in acoustics and on engineering applications. The journal considers review papers, scientific papers, technical and applied papers, short communications, letters to the editor. From time to time, special issues and review articles are also published. For book reviews or doctoral thesis abstracts, please contact the Editor in Chief.
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