The effect of thickness and density on the Acoustics properties of Ceiba pentandra natural fiber

Mohd Faizal Mat Tahir, Mohd. Zaki Nuawi, Rozli Zulkifli, A. K. Elwaleed, S. M. Mat Yunoh

Research output: Contribution to journalArticle

Abstract

This paper presents a study of the acoustic properties of the single layer kapok fiber @ Ceiba pentandra. The acoustic properties studied in this study are the sound absorption coefficient, a and the value of Transmission Loss, TL. Experimental measurement was conducted in Acoustics Lab, Mechanical and Materials Engineering Department, UKM by using an impedance tube in accordance to ISO 10534-2 and ASTM E1050-98 standards. Two sets of diameter used in this experiment are 28 mm for high frequency and 100 mm for low frequency experiments. This study examines the effect of thickness and density of kapok fiber on sound absorption coefficient and transmission loss value. The tested sample has 3 different thicknesses of 20 mm, 30 mm, and 40 mm for both diameters but having the same density of 40 kg/m3. For different densities, the sample divided into 3 densities of 40 kg/m3, 50 kg/m3 and 60 kg/m3 with all the samples having a thickness of 20 mm. The experimental results of sound absorption coefficients for different thickness samples show an optimum sound absorption coefficient of 0.91 at 4250 Hz for all three thicknesses. Different density tests provide the optimum noise absorption coefficient at 4250 Hz for all thicknesses of 0.89, 0.91 and 0.86 for density 40 kg/m3, 50 kg/m3 and 60 kg/m3 respectively. For transmission loss, optimum loss happens at 5600 Hz frequency with a value of 17.5 dB, 25.8 dB and 34.5 dB for the thickness of 20 mm, 30 mm and 40 mm respectively. The results show that natural fibers of the kapok trees can produce some quality, value for sound absorption and can be used as an alternative material for use as sound absorbers. Furthermore, kapok natural fibers are widely available, safer for the environment and do not endanger to human.

Original languageEnglish
Pages (from-to)3214-3218
Number of pages5
JournalARPN Journal of Engineering and Applied Sciences
Volume13
Issue number9
Publication statusPublished - 1 May 2018

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Acoustic properties
Natural fibers
Acoustic waves
Fibers
Acoustics
Experiments

Keywords

  • Kapok fiber
  • Natural fiber
  • Sound absorption
  • Transmission loss

ASJC Scopus subject areas

  • Engineering(all)

Cite this

The effect of thickness and density on the Acoustics properties of Ceiba pentandra natural fiber. / Mat Tahir, Mohd Faizal; Nuawi, Mohd. Zaki; Zulkifli, Rozli; Elwaleed, A. K.; Mat Yunoh, S. M.

In: ARPN Journal of Engineering and Applied Sciences, Vol. 13, No. 9, 01.05.2018, p. 3214-3218.

Research output: Contribution to journalArticle

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