A practical acoustical absorption analysis of coir fiber based on rigid frame modeling

Md Ayub, Mohd. Jailani Mohd Nor, Mohammad Hosseini Fouladi, Rozli Zulkifli, Nowshad Amin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

An analytical study based on rigid frame model is demonstrated to evaluate the acoustic absorption of coir fiber. Effects of different conditions such as combination of air gap and perforated plate (PP) are studied in this work. Materials used here are treated as rigid rather than elastic, since the flow resistivity of coir fiber is very low. The well-known rigid frame Johnson-Allard equivalent-fluid model is applied to obtain the acoustic impedance of single layer coir fiber. Atalla and Sgard model is employed to estimate the surface impedance of PP. Acoustic transmission approach (ATA) is utilized for adding various consecutive layers in multilayer structure. Models are examined in different conditions such as single layer coir fiber, coir fiber backed with air gap, single layer PP in combination with coir fiber and air gap. Experiments are conducted in impedance tube on normal incidence sound absorption to validate the results. Results from the measurement are found to be in well agreement with the theoretical absorption coefficients. The performance of the rigid frame modeling method is checked more specifically in all conditions, by the mean prediction error rate of normal incidence sound absorption coefficients. Comparison between the measured absorption coefficients and predicted by rigid frame method shows discrepancy lower than 20 and 15% for most of the conditions in the frequency range of 0.2-1.5 and 1.5-5 kHz, respectively. Moreover, acoustic absorption of various single and multilayer structures is compared with the simpler empirical methods such as Delany-Bazley and Miki model; and complicated method such as Biot-Allard Model and Allard Transfer Function (TF) method. Comparisons show that the presented method offers a better accuracy of the results than the empirical models. Subsequently, it can provide almost same absorption plot with Biot-Allard model (single layer combination) and TF method (multilayer combination) proving it to be a comprehensively easy and general analytical tool. Therefore, the rigid frame model can be implemented relatively easier than other similar models to analyze the acoustic absorption of coir fiber in most of the conditions.

Original languageEnglish
Pages (from-to)246-255
Number of pages10
JournalAcoustical Physics
Volume58
Issue number2
DOIs
Publication statusPublished - Mar 2012

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fibers
perforated plates
absorptivity
acoustics
sound transmission
transfer functions
laminates
air
incidence
impedance
acoustic impedance
plots
frequency ranges
tubes
electrical resistivity
fluids
estimates
predictions

Keywords

  • Absorber panel
  • Analytical technique
  • Atalla and Sgard model
  • Coir fiber
  • Rigid frame model

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

A practical acoustical absorption analysis of coir fiber based on rigid frame modeling. / Ayub, Md; Mohd Nor, Mohd. Jailani; Fouladi, Mohammad Hosseini; Zulkifli, Rozli; Amin, Nowshad.

In: Acoustical Physics, Vol. 58, No. 2, 03.2012, p. 246-255.

Research output: Contribution to journalArticle

Ayub, Md ; Mohd Nor, Mohd. Jailani ; Fouladi, Mohammad Hosseini ; Zulkifli, Rozli ; Amin, Nowshad. / A practical acoustical absorption analysis of coir fiber based on rigid frame modeling. In: Acoustical Physics. 2012 ; Vol. 58, No. 2. pp. 246-255.
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AB - An analytical study based on rigid frame model is demonstrated to evaluate the acoustic absorption of coir fiber. Effects of different conditions such as combination of air gap and perforated plate (PP) are studied in this work. Materials used here are treated as rigid rather than elastic, since the flow resistivity of coir fiber is very low. The well-known rigid frame Johnson-Allard equivalent-fluid model is applied to obtain the acoustic impedance of single layer coir fiber. Atalla and Sgard model is employed to estimate the surface impedance of PP. Acoustic transmission approach (ATA) is utilized for adding various consecutive layers in multilayer structure. Models are examined in different conditions such as single layer coir fiber, coir fiber backed with air gap, single layer PP in combination with coir fiber and air gap. Experiments are conducted in impedance tube on normal incidence sound absorption to validate the results. Results from the measurement are found to be in well agreement with the theoretical absorption coefficients. The performance of the rigid frame modeling method is checked more specifically in all conditions, by the mean prediction error rate of normal incidence sound absorption coefficients. Comparison between the measured absorption coefficients and predicted by rigid frame method shows discrepancy lower than 20 and 15% for most of the conditions in the frequency range of 0.2-1.5 and 1.5-5 kHz, respectively. Moreover, acoustic absorption of various single and multilayer structures is compared with the simpler empirical methods such as Delany-Bazley and Miki model; and complicated method such as Biot-Allard Model and Allard Transfer Function (TF) method. Comparisons show that the presented method offers a better accuracy of the results than the empirical models. Subsequently, it can provide almost same absorption plot with Biot-Allard model (single layer combination) and TF method (multilayer combination) proving it to be a comprehensively easy and general analytical tool. Therefore, the rigid frame model can be implemented relatively easier than other similar models to analyze the acoustic absorption of coir fiber in most of the conditions.

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