Noise absorption properties of coir fiber with porous layer facing

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study was conducted to investigate the potential of coconut coir fiber as sound absorber. To improve their acoustical characteristic in low frequencies, porous layer were used in the front and back as facing. Effects of porous layer facing on sound absorption coefficient of sound absorber using coconut coir fiber were studied. Non-woven cotton cloth was the type of porous layer that were used as facing for coconut coir fiber, which have been used widely in automotive industry. 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 experimental data obtained indicate that porous layer facing can improve noise properties at low and high frequencies with significant increased in noise absorption coefficient index. The data presented shows that facing with porous layer in the front coconut coir fiber sound absorber is better than facing at the back. Twenty millimeter thick layer coconut coir fiber facing with porous layer in the front exhibits peak value at frequency 2750 Hz - 2825 Hz with maximum value of 0.97. The good agreement was obtained from experimental and analysis results using equivalent electrical circuit approach. This indicated that the equivalent electrical circuit approach can be used to design and optimize the acoustic characteristic coir fiber as sound absorber.

Original languageEnglish
Pages (from-to)405-409
Number of pages5
JournalInternational Review of Mechanical Engineering
Volume4
Issue number4
Publication statusPublished - May 2010

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Acoustic waves
Fibers
Acoustics
Networks (circuits)
Automotive industry
Cotton

Keywords

  • Coconut coir fiber
  • Noise absorption
  • Porous layer
  • The equivalent electrical circuit approach

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Noise absorption properties of coir fiber with porous layer facing. / Zulkifli, Rozli; Zulkarnain, Z.; Mohd Nor, Mohd. Jailani.

In: International Review of Mechanical Engineering, Vol. 4, No. 4, 05.2010, p. 405-409.

Research output: Contribution to journalArticle

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