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Materials 2017, 10(11), 1277; doi:10.3390/ma10111277

Characterization of Sheep Wool as a Sustainable Material for Acoustic Applications

1
Centro de Tecnologías Físicas, Universitat Politècnica de València, EPS Gandia, C/Paraninf, 1, 46730 Grao de Gandia, Valencia, Spain
2
Centro de Tecnologías Físicas, Universitat Politècnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Received: 29 September 2017 / Revised: 2 November 2017 / Accepted: 3 November 2017 / Published: 7 November 2017
(This article belongs to the Special Issue Recycled Materials, Eco-design and 3D Printing)
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Abstract

In recent years, natural materials are becoming a valid alternative to traditional sound absorbers due to reduced production costs and environmental protection. This paper reports the acoustical characterization of sheep wool. Measurements on normal incidence and diffuse-incidence sound absorption coefficients of different samples are reported. The airflow resistance has also been measured. The results prove that sheep wool has a comparable sound absorption performance to that of mineral wool or recycled polyurethane foam. An empirical model is used to calculate the sound absorption of sheep wool samples. A reasonable agreement on the acoustic absorption of all sheep wool samples is obtained. View Full-Text
Keywords: natural material; sound absorption; flow resistance; sheep wool; delany-bazley model natural material; sound absorption; flow resistance; sheep wool; delany-bazley model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

del Rey, R.; Uris, A.; Alba, J.; Candelas, P. Characterization of Sheep Wool as a Sustainable Material for Acoustic Applications. Materials 2017, 10, 1277.

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