Abstract
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.
Highlights
Sound absorption is one of the most important techniques in architectural and building acoustics
It is used to control the reverberation time in rooms to adjust it to be suitable for the purpose of the rooms and built environment. This is of vital importance in spaces for musical performance [1,2] but for speech communication in any built environment, for example, public spaces such as the foyer of railway stations or airports, etc., to keep high speech intelligibility [3]
High speech intelligibility is quite important in emergency cases in buildings [4]
Summary
Sound absorption is one of the most important techniques in architectural and building acoustics. It is used to control the reverberation time in rooms to adjust it to be suitable for the purpose of the rooms and built environment. This is of vital importance in spaces for musical performance [1,2] but for speech communication in any built environment, for example, public spaces such as the foyer of railway stations or airports, etc., to keep high speech intelligibility [3]. High speech intelligibility is quite important in emergency cases in buildings [4]. In the emergency cases and in daily life in any kind of buildings, sound absorption takes important role. Noise abatement by sound absorption is necessary for houses in urban area to protect comfortable living environment from annoyance due to various noise including neighbour noise [8]
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