Analysis on multiple perforated plate sound absorber made of coir fiber

Md Ayub, Mohammad Hosseini Fouladi, Masomeh Ghassem, Mohd. Jailani Mohd Nor, Hamidreza Soheili Najafabadi, Nowshad Amin, Rozli Zulkifli

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Current studies are aiming to improve the sound absorption of coir fiber by implementing combinations of Perforated Plates (PPs) and air gaps. The Atalla and Sgrad model along with Johnson-Allard model and Acoustic Transmission Analysis (ATA) approach are used to estimate the absorption coefficient of the combination. Measurements are conducted in impedance tube to validate the analytical results. Outcomes show that the absorption coefficient of the panel is governed by the porosities of the implemented PPs. Reduction in the porosity of the face PP causes the incident sound to reflect back whereas higher porosity encourages the sound to enter and be absorbed gradually in the inner compartments. For the case of multilayer panels with two PPs, the best result is obtained when the inner PP has low porosity and is backed with an air gap. Absorption in high and low frequency bands are enhanced by having highly porous material and a thick layer of air gap in front of and behind the inner PP, respectively. This study shows that the high-frequency absorption is enhanced further in panels that include three PP layers. The study suggests fabricating panels containing two or three PPs with gradual reduction of porosity from the face PP to the inner ones, while the inner most PP has low porosity and is backed with air gap.

Original languageEnglish
Pages (from-to)203-211
Number of pages9
JournalInternational Journal of Acoustics and Vibrations
Volume19
Issue number3
Publication statusPublished - 1 Sep 2014

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perforated plates
Perforated plates
absorbers
Acoustic waves
fibers
acoustics
Fibers
Porosity
porosity
air
Air
absorptivity
sound transmission
compartments
porous materials
Frequency bands
Porous materials
Multilayers
Acoustics
impedance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Acoustics and Ultrasonics

Cite this

Analysis on multiple perforated plate sound absorber made of coir fiber. / Ayub, Md; Hosseini Fouladi, Mohammad; Ghassem, Masomeh; Mohd Nor, Mohd. Jailani; Najafabadi, Hamidreza Soheili; Amin, Nowshad; Zulkifli, Rozli.

In: International Journal of Acoustics and Vibrations, Vol. 19, No. 3, 01.09.2014, p. 203-211.

Research output: Contribution to journalArticle

Ayub, Md ; Hosseini Fouladi, Mohammad ; Ghassem, Masomeh ; Mohd Nor, Mohd. Jailani ; Najafabadi, Hamidreza Soheili ; Amin, Nowshad ; Zulkifli, Rozli. / Analysis on multiple perforated plate sound absorber made of coir fiber. In: International Journal of Acoustics and Vibrations. 2014 ; Vol. 19, No. 3. pp. 203-211.
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