Sound absorption performance of natural kenaf fibres

Z. Y. Lim, A. Putra, Mohd. Jailani Mohd Nor, M. Y. Yaakob

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

In recent years, kenaf fibre has been highlighted for its superiority as the filler for composite materials. However, study of the fibres as an acoustic absorber is still lacking. In this paper, the sound absorption of kenaf fibre specimens are studied both under normal and random sound incidence. The normal-incidence sound absorption coefficient measurement was conducted using the impedance tube method. The effects of thickness involving full fibre and air-fibre specimen and the effect of bulk density were discussed. For the random-incidence sound absorption coefficient, the test was conducted in a reverberation chamber. From both methods, the results in general reveal that for bulk density of 140–150 kg/m3 and thickness of 25–30 mm, the absorption coefficient is above 0.5 starting from 500 Hz and can reach 0.85 on average above 1.5 kHz. These frequency bandwidth of absorption and the level of absorption coefficient improve significantly when bulk density and thickness are increased. Additional air gap also improve the absorption toward lower frequency.

Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalApplied Acoustics
Volume130
DOIs
Publication statusPublished - 15 Jan 2018
Externally publishedYes

Fingerprint

sound transmission
absorptivity
fibers
incidence
reverberation chambers
acoustics
air
fillers
absorbers
impedance
tubes
low frequencies
bandwidth
composite materials

Keywords

  • Acoustic absorber
  • Kenaf fibre
  • Natural fibre
  • Normal incidence sound absorption coefficient
  • Random incidence sound absorption coefficient

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Sound absorption performance of natural kenaf fibres. / Lim, Z. Y.; Putra, A.; Mohd Nor, Mohd. Jailani; Yaakob, M. Y.

In: Applied Acoustics, Vol. 130, 15.01.2018, p. 107-114.

Research output: Contribution to journalArticle

Lim, Z. Y. ; Putra, A. ; Mohd Nor, Mohd. Jailani ; Yaakob, M. Y. / Sound absorption performance of natural kenaf fibres. In: Applied Acoustics. 2018 ; Vol. 130. pp. 107-114.
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