Effect of Thickness, Density and Cavity Depth on the Sound Absorption Properties of Wool Boards

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Abstract

A novel wool absorption board was prepared by using a traditional non-woven technique with coarse wools as the main raw material mixed with heat binding fibers. By using the transfer-function method and standing wave tube method, the sound absorption properties of wool boards in a frequency range of 250-6300 Hz were studied by changing the thickness, density, and cavity depth. Results indicated that wool boards exhibited excellent sound absorption properties, which at high frequencies were better than that at low frequencies. With increasing thickness, the sound absorption coefficients of wool boards increased at low frequencies and fluctuated at high frequencies. However, the sound absorption coefficients changed insignificantly and then improved at high frequencies with increasing density. With increasing cavity depth, the sound absorption coefficients of wool boards increased significantly at low frequencies and decreased slightly at high frequencies.

[1] Y. C. Kang. Design and technology of practical building absorption. (2007)1th ed. Beijing: China Build Ind Press.

[2] S. Ersoy, H. Küçük. (2009). Investigation of industrial tealeaf- fiber waste material for its sound absorption properties. Appl Acoust, 70(1), 215-220.

[3] M. J. M. Nor, N. Jamaludin, F. M. Tamiri. (2004). A preliminary study of sound absorption using multi-layer coconut coir fibers. Tech Acoust, 3, 1-8.

[4] X. Yu, L. Lv, C. Wei, Y. Cui, X. Wang, T. Li. (2014). Research on sound absorption properties of multilayer structural material based on discarded polyester fiber. J Text Inst, 105(10), 1009-1013.

[5] Y. Na, G. Cho. (2010). Sound absorption and viscoelastic property of acoustical automotive nonwovens and their plasma treatment. Fiber Polym, 11(5), 782-789.

[6] Y. Shen, G. Jiang. (2014). Effects of different parameters on acoustic properties of activated carbon fiber felts. J Text Inst, 105(4), 392-397.

[7] Rwawiire S, Tomkova B, Gliscinska E. (2015). Investigation of Sound Absorption Properties of Bark Cloth Nonwoven Fabric and Composites. Autex Research Journal, 15(3):173-180.

[8] D. Y. Ma, H. Shen. Handbook of Acoustics. 2th ed. Beijing (2004): Sci Press.

[9] Arenas C, Leiva C, Vilches L F. (2017). Approaching a methodology for the development of a multilayer sound absorbing device recycling coal bottom ash. Applied Acoustics, 115(1):81-87.

[10] K. O. Ballagh. (1996). Acoustical properties of wool. Appl Acoust, 48(2), 101-120.

[11] G. Cheng. (2009). Properties and application of wool thermal insulating products for sound absorption. New Build Mater, 36(5), 63-66.

[12] DE-DIN. DIN EN ISO 10534-2-2001, (2001) (Acoustics- Determination of sound absorption coefficient and impedance in impedance tubes-Part 2: Transfer function method). Germany.

Autex Research Journal

The Journal of Association of Universities for Textiles (AUTEX)

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