Analysis of coir fiber acoustical characteristics

Mohammad Hosseini Fouladi, Md Ayub, Mohd. Jailani Mohd Nor

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

Coir fiber from coconut husk is an important agricultural waste in Malaysia. Acoustic absorption coefficient of the fiber as a porous material is studied in this paper. Two types of fiber are investigated, fresh from wet market and industrial prepared mixed with binder. Moreover two analytical models, namely; Delany-Bazley and Biot-Allard are used for analysis. Experimental measurements in impedance tube are conducted to validate the analytical outcomes. Results show that fresh coir fiber has an average absorption coefficient of 0.8 at f > 1360 Hz and 20 mm thickness. Increasing the thickness is improved the sound absorption in lower frequencies, having the same average at f > 578 Hz and 45 mm thickness. Delany-Bazley technique can be used for both types of fiber while Biot-Allard method is compensated for the industrial prepared fiber considering the binder additive. This form generally shows poor acoustical absorption in low frequencies. Inevitably, fiber has to be mixed with additives in commercial use to enhance its characteristics such as stiffness, unti-fungus and flammability. Hence other approaches such as adding air gap or perforated plate should be used to improve the acoustical properties of industrial treated coir fiber.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalApplied Acoustics
Volume72
Issue number1
DOIs
Publication statusPublished - Jan 2011

Fingerprint

fibers
Biot method
absorptivity
perforated plates
low frequencies
Malaysia
flammability
fungi
sound transmission
porous materials
stiffness
impedance
tubes
acoustics
air

Keywords

  • Acoustic absorption coefficient
  • Biot-Allard model
  • Coir fiber
  • Delany-Bazley model
  • Porous material

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Hosseini Fouladi, M., Ayub, M., & Mohd Nor, M. J. (2011). Analysis of coir fiber acoustical characteristics. Applied Acoustics, 72(1), 35-42. https://doi.org/10.1016/j.apacoust.2010.09.007

Analysis of coir fiber acoustical characteristics. / Hosseini Fouladi, Mohammad; Ayub, Md; Mohd Nor, Mohd. Jailani.

In: Applied Acoustics, Vol. 72, No. 1, 01.2011, p. 35-42.

Research output: Contribution to journalArticle

Hosseini Fouladi, M, Ayub, M & Mohd Nor, MJ 2011, 'Analysis of coir fiber acoustical characteristics', Applied Acoustics, vol. 72, no. 1, pp. 35-42. https://doi.org/10.1016/j.apacoust.2010.09.007
Hosseini Fouladi, Mohammad ; Ayub, Md ; Mohd Nor, Mohd. Jailani. / Analysis of coir fiber acoustical characteristics. In: Applied Acoustics. 2011 ; Vol. 72, No. 1. pp. 35-42.
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