Acoustical Science and Technology
Online ISSN : 1347-5177
Print ISSN : 1346-3969
ISSN-L : 0369-4232
TRANSLATED PAPER
Predictive model of sound propagation in porous materials: Quantification of fiber nonwoven fabric by material density and fiber diameter
Daisuke Kato
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2023 Volume 44 Issue 5 Pages 383-395

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Abstract

Many predictive models of sound propagation in porous materials require flow resistivity as a parameter. In the case of fibrous materials, flow resistivity varies with bulk density (by forming) and is not necessarily an efficient parameter. On the other hand, only the material density and fiber diameter of fibrous materials are the physical quantities that do not vary with a change in bulk density. If one of these physical quantities is used as a parameter, since it does not vary with a change in bulk density and its measurement is not necessary, the acoustic design work (optimization of the fiber mixing rate) of fibrous materials would become possible. In this paper, the relationships of the material density and fiber diameter of fibrous materials with the normal incidence absorption coefficient are clarified, and a new predictive model is shown.

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© 2023 by The Acoustical Society of Japan
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