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KEY WORDS

Porosity, Flow Resistivity, Tortuosity, Measurement.

ABSTRACT

One of the most frequent problems faced by noise control engineers is how to design sound absorbers that provide the desirable sound absorption coefficient that minimizes the size and cost, does not introduce any environmental hazards, and stands up to hostile environments. The designers of sound absorbers must know how to choose the proper sound absorbing materials, its geometry and the protective facing. Porous sound-absorbing materials are utilized in almost all areas of noise control engineering. This paper deals with the acoustical parameters of porous materials and their measurement.

CITATION INFORMATION

Acta Mechanica Slovaca. Volume 15, Issue 2, Pages 28 – 32, ISSN 1335-2393

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  Porous Sound Absorbers and Determination of their Acoustical Properties

REFERENCES

[1] [ISO 9053] International Organization for Standardization Acoustics - Materials for acoustical applications - Determination for airflow resistance.

[2] ASTM C 522-87: Standard Test Method for Airflow Resistance of Acoustical Materials., American Society for Testing and Materials, West Conshohocken, PA, pp 169 – 173
[3] Beranek L. L., Acoustic impedance of porous materials, J. Acoust. Soc.Am. 13, 1942, pp. 248-260
[4] Champoux Y.- Stinson M.R. –Daigle G.A..: Air- Based System for the Measurement of Porosity, J. Acoust. Soc. Am, 1991, pp. 910 – 916
[5] Delany M. E. and Bazley E. N., Acoustical properties of fibrous absorbent materials, Applied Acoustics 3, 1970, pp. 105-116
[6] Miki Y., Acoustical properties of porous materials - Modifications of Delany-Bazley models, J. Acoust. Soc. Jpn (E). 11(1), 1990, pp.19-24
[7] Stinson M. R. –Daigle G.A.: Electronic System for the Measurement of Flow Resistance. J. Acoust. Soc. Am. 1988, pp. 2422 – 2428
[8] Vér I.L. – Beranek L.L.: Noise end vibration control engineering: prin32 VOLUME 15, No. 2, 2011 ciples and applications. John Wiley &Sons Inc., Hoboken, New Jersey, USA, 2006, pp. 215 – 237
[9] www.ampr.matelys.com
[10] www.fys.kuleuven.be
[11] www.noe.co.jp

Latest Issue

ams 2 2016

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