Effect of Perforated size and air gap thickness on acoustic properties of coir fibre sound absorption panels

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Abstract

This research was carried out to study the potential use of coir fibre in a sound absorption panel. The effects of perforated hole total size and air gap thickness on sound absorption coefficient of sound insulation panel using coir fibre were studied. Two types of panels were used: panel with different perforated size of 10%, 15% and 22%, and panel with air gap thicknesses of 10 mm, 15 mm and 20 mm. The air gap thickness is the distance between the fibre and the back panel plate. The panels were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia using the ISO 354 (1985) standard for noise absorption coefficients. The Noise Reduction Coefficient (NRC) is a scalar representation of the amount of sound energy absorbed upon striking a particular surface. It is the average of four sound absorption coefficients of the particular surface at frequencies of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. The maximum sound absorption coefficients for panel with percentage perforated plate area of 10%, 15% and 22% are 0.73,0.73 and 0.67 at frequency of 2000 Hz. The maximum sound absorption coefficients for panel using the different air gap thickness of 5 mm, 10 mm and 15 mm are 0.68,0.56 and 0.67 for frequency of 2000 Hz. The results show that the distribution of sound absorption coefficient of the panel using coir fibre over different frequency range can be controlled using the perforated area size and air gap thickness.

Original languageEnglish
Pages (from-to)242-252
Number of pages11
JournalEuropean Journal of Scientific Research
Volume28
Issue number2
Publication statusPublished - 2009

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acoustic properties
coir
acoustic property
Acoustic properties
Acoustics
Absorption Coefficient
absorption coefficient
Absorption
Air
Acoustic waves
Fiber
air
Fibers
Noise
Sound insulation
Perforated plates
Malaysia
fibre
effect
sound

Keywords

  • Acoustic materials
  • Air gap thickness
  • Coir fibre
  • Noise absorption coefficient
  • Perforated area

ASJC Scopus subject areas

  • General

Cite this

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title = "Effect of Perforated size and air gap thickness on acoustic properties of coir fibre sound absorption panels",
abstract = "This research was carried out to study the potential use of coir fibre in a sound absorption panel. The effects of perforated hole total size and air gap thickness on sound absorption coefficient of sound insulation panel using coir fibre were studied. Two types of panels were used: panel with different perforated size of 10{\%}, 15{\%} and 22{\%}, and panel with air gap thicknesses of 10 mm, 15 mm and 20 mm. The air gap thickness is the distance between the fibre and the back panel plate. The panels were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia using the ISO 354 (1985) standard for noise absorption coefficients. The Noise Reduction Coefficient (NRC) is a scalar representation of the amount of sound energy absorbed upon striking a particular surface. It is the average of four sound absorption coefficients of the particular surface at frequencies of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz. The maximum sound absorption coefficients for panel with percentage perforated plate area of 10{\%}, 15{\%} and 22{\%} are 0.73,0.73 and 0.67 at frequency of 2000 Hz. The maximum sound absorption coefficients for panel using the different air gap thickness of 5 mm, 10 mm and 15 mm are 0.68,0.56 and 0.67 for frequency of 2000 Hz. The results show that the distribution of sound absorption coefficient of the panel using coir fibre over different frequency range can be controlled using the perforated area size and air gap thickness.",
keywords = "Acoustic materials, Air gap thickness, Coir fibre, Noise absorption coefficient, Perforated area",
author = "Rozli Zulkifli and {Mohd Nor}, {Mohd. Jailani} and Ismail, {Ahmad Rasdan} and Nuawi, {Mohd. Zaki} and {Mat Tahir}, {Mohd Faizal}",
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AU - Zulkifli, Rozli

AU - Mohd Nor, Mohd. Jailani

AU - Ismail, Ahmad Rasdan

AU - Nuawi, Mohd. Zaki

AU - Mat Tahir, Mohd Faizal

PY - 2009

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