Characterization of Acoustical Properties of Felt and Carpet Made of Natural and Environmentally Friendly Materials

Journal article

Aygun, H. (2017). Characterization of Acoustical Properties of Felt and Carpet Made of Natural and Environmentally Friendly Materials. Open Journal of Acoustics. 7 (2), pp. 27-38. https://doi.org/10.4236/oja.2017.72004
AuthorsAygun, H.
Abstract

Sound absorbers including porous materials are used widely for noise control. The most widely-exploited and acknowledged absorption mechanism in porous materials is viscous friction due to relative motion between solid and fluid. Acoustical performance of woven (carpet) and nonwoven (felt) materials made of wool using a traditional technique was investigated. Absorption coefficient of felt was measured using standing wave tube method with and without an air cavity. Data were compared with predictions determined using the laws of Delany and Bazely. Very good agreement between data and predictions was observed. Sound absorption coefficients of both materials also were measured using an impedance gun technique over a wider frequency range. Absorption coefficient obtained using impedance gun method shows that the absorption coefficient of felt is higher than the absorption coefficient of carpet for mid and higher frequencies. Furthermore insertion loss (IL) of the felt was measured in a circular duct. It is found that felt can attenuate sound pressure level between 1 dB and 10 dB.

KeywordsAbsorption Coefficient, Insertion Loss, Carpet, Felt, Sound Propagation
Year2017
JournalOpen Journal of Acoustics
Journal citation7 (2), pp. 27-38
PublisherScientific research publishing
ISSN2162-5794
Digital Object Identifier (DOI)https://doi.org/10.4236/oja.2017.72004
Publication dates
Print16 Jun 2017
Publication process dates
Deposited30 Nov 2017
Accepted13 Jun 2017
Accepted author manuscript
License
File Access Level
Open
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