A Basic Study on a Rectangular Plane Space Sound Absorber Using Permeable Membranes
1
Environmental Acoustics Laboratory, Department of Architecture, Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan
2
Department of Architecture, Faculty of Environmental and Urban Engineering, Kansai University, Osaka 564-8680, Japan
*
Author to whom correspondence should be addressed.
Sustainability 2019, 11(7), 2185; https://doi.org/10.3390/su11072185
Received: 31 March 2019 / Revised: 8 April 2019 / Accepted: 10 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Sustainable Acoustic Materials)
In this communication, the sound absorption characteristics of rectangular-shaped plane space sound absorbers without any backing structure using permeable membranes (PMs) are measured by reverberation room method. First, three types of PMs, in this study woven fabrics, are selected with different flow resistances and surface densities. They are prepared in the plane rectangular-shaped space absorbers of two different sizes. The measured results are discussed through comparison with the existing theoretical and measured results for absorbers of the other shapes or configurations. The present results and discussion demonstrate that the reverberation absorption coefficients of the proposed absorbers are low at low frequencies and converge to a moderately high value at high frequencies. Especially, ones with higher flow resistance than the air impedance converge to a value greater than 0.5, which is a theoretically estimated maximum absorption coefficient of infinite single-leaf PM. This is inferred to be attributed mainly to area effect. From these results the proposed absorbers can be used effectively despite of their very simple structure. Also it is found that the proposed absorber can offer higher sound absorption than permeable membrane absorbers of other shapes or configuration. Regarding the effect of the size, the absorbers of smaller size offer higher absorption coefficients regardless of material properties of the PMs used in the experiments.
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Keywords:
sound absorption; permeable membrane; reverberant sound absorption coefficient; space sound absorber; rectangular plane
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MDPI and ACS Style
Sakagami, K.; Okuzono, T.; Somatomo, Y.; Funahashi, K.; Toyoda, M. A Basic Study on a Rectangular Plane Space Sound Absorber Using Permeable Membranes. Sustainability 2019, 11, 2185. https://doi.org/10.3390/su11072185
AMA Style
Sakagami K, Okuzono T, Somatomo Y, Funahashi K, Toyoda M. A Basic Study on a Rectangular Plane Space Sound Absorber Using Permeable Membranes. Sustainability. 2019; 11(7):2185. https://doi.org/10.3390/su11072185
Chicago/Turabian StyleSakagami, Kimihiro, Takeshi Okuzono, Yu Somatomo, Kota Funahashi, and Masahiro Toyoda. 2019. "A Basic Study on a Rectangular Plane Space Sound Absorber Using Permeable Membranes" Sustainability 11, no. 7: 2185. https://doi.org/10.3390/su11072185
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