Implementation of coir fiber as acoustic absorber material

Mohammad Hosseini Fouladi, Masomeh Ghassem, Md Ayub, Mohd. Jailani Mohd Nor

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Coir fiber is one of the natural fibers that can be easily found in tropical countries like Malaysia. This study illuminates the acoustical absorption of coir fiber throughout the frequency spectrum. The empirical Delany-Bazley method together with Allard elastic model were the two analytical approaches implemented in this research. Outputs of analytical techniques were validated by impedance tube measurements. Both methods were able to show the general pattern but existing frame resonance/resonances could only be predicted by Allard model as Delany-Bazley method does not take modulus of elasticity into consideration. Absorption of fresh coir fiber was satisfactory; more than 70% at f>600 Hz for a 30 mm thickness sample with resonance peak center frequency at 1 kHz. The industrial prepared coir fiber is mixed with binder; has higher stiffness and contains less amount of moisture compared to fresh samples. Therefore the absorption of industrial prepared fibers with the same thickness were generally less than 70% except for a small region around its resonance peak which also happened at higher frequency of 2.6 kHz. It is suggested that absorption of the industrial samples should be improved further in order to be used in real world applications.

Original languageEnglish
Pages (from-to)11-16
Number of pages6
JournalNoise and Vibration Worldwide
Volume42
Issue number9
DOIs
Publication statusPublished - 1 Oct 2011

Fingerprint

absorbers (materials)
Acoustics
fibers
acoustics
Fibers
Natural fibers
Malaysia
Binders
moisture
Moisture
Elastic moduli
Stiffness
coir
stiffness
modulus of elasticity
impedance
tubes
output

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Acoustics and Ultrasonics

Cite this

Implementation of coir fiber as acoustic absorber material. / Fouladi, Mohammad Hosseini; Ghassem, Masomeh; Ayub, Md; Mohd Nor, Mohd. Jailani.

In: Noise and Vibration Worldwide, Vol. 42, No. 9, 01.10.2011, p. 11-16.

Research output: Contribution to journalArticle

Fouladi, Mohammad Hosseini ; Ghassem, Masomeh ; Ayub, Md ; Mohd Nor, Mohd. Jailani. / Implementation of coir fiber as acoustic absorber material. In: Noise and Vibration Worldwide. 2011 ; Vol. 42, No. 9. pp. 11-16.
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