Effect of Porous Layer Backing and Perforated Panel on Acoustic Characteristic For Coconut Coir Fiber Sound Absorber

Zulkarnain, Zulkarnain and Rozli, Zulkifli and Jailani, Mohd Nor Mohd (2009) Effect of Porous Layer Backing and Perforated Panel on Acoustic Characteristic For Coconut Coir Fiber Sound Absorber. In: Regional Engineering Postgraduate Conference 2009, 21-22 Oktober 2009, Malaysia.

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Abstract

This study was conducted to investigate the opportunity using coconut coir fiber as sound absorber. The effects of porous layer backing and perforated plate on sound absorption coefficient of sound absorber using coconut coir fiber were studied. Woven cotton cloth were type porous layer that were used, which have been used widely in automotive industry. Perforated plate were provided with perforation ratio 0.20, thickness 1 mm, and hole diameter 2 mm. The samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, according to ASTM E 1050-98 international standards for noise absorption coefficient. The experiment data indicate that porous layer backing can improve noise absorption coefficient at low and high frequencies with significant increasing. Twenty millimetres thick layer coconut coir fiber backing with porous layer exhibit peak value at frequency 2750 Hz ? 2825 Hz with maximum value 0.97. With perforated plate, result indicated that noise absorption coefficient shift to lower frequency range.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ1-1570 Mechanical engineering and machinery
Divisions:	03-Faculty of Engineering > 21201-Mechanical Engineering (S1)
Depositing User:	Zulkarnain Ali Leman
Date Deposited:	23 Dec 2019 17:07
Last Modified:	23 Dec 2019 17:07
URI:	http://repository.unsri.ac.id/id/eprint/22196

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