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Article

Angle-Dependent Absorption of Sound on Porous Materials

1
Lumir Oy, Tammiston Kauppatie 22, 01510 Vantaa, Finland
2
Aalto Acoustics Lab, Department of Signal Processing and Acoustics, School of Electrical Engineering, Aalto University, P.O. Box 13100, 00076 Aalto, Finland
3
Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
*
Author to whom correspondence should be addressed.
Acoustics 2020, 2(4), 753-765; https://doi.org/10.3390/acoustics2040041
Received: 31 August 2020 / Revised: 30 September 2020 / Accepted: 12 October 2020 / Published: 16 October 2020
Sound-absorbing materials are usually measured in a reverberation chamber (diffuse field condition) or in an impedance tube (normal sound incidence). In this paper, we show how angle-dependent absorption coefficients could be measured in a factory-type setting. The results confirm that the materials have different attenuation behavior to sound waves coming from different directions. Furthermore, the results are in good agreement with sound absorption coefficients measured for comparison in a reverberation room and in an impedance tube. In addition, we introduce a biofiber-based material that has similar sound absorption characteristics to glass-wool. The angle-dependent absorption coefficients are important information in material development and in room acoustics modeling. View Full-Text
Keywords: bio-based materials; porous materials; sound absorption; angle-dependent measurements bio-based materials; porous materials; sound absorption; angle-dependent measurements
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MDPI and ACS Style

Cucharero, J.; Hänninen, T.; Lokki, T. Angle-Dependent Absorption of Sound on Porous Materials. Acoustics 2020, 2, 753-765. https://doi.org/10.3390/acoustics2040041

AMA Style

Cucharero J, Hänninen T, Lokki T. Angle-Dependent Absorption of Sound on Porous Materials. Acoustics. 2020; 2(4):753-765. https://doi.org/10.3390/acoustics2040041

Chicago/Turabian Style

Cucharero, Jose, Tuomas Hänninen, and Tapio Lokki. 2020. "Angle-Dependent Absorption of Sound on Porous Materials" Acoustics 2, no. 4: 753-765. https://doi.org/10.3390/acoustics2040041

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