4.7 Article

Sound absorption performance of natural fiber composite from chrome shave and coffee silver skin

Journal

APPLIED ACOUSTICS
Volume 182, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2021.108264

Keywords

Coffee silver skin; Chrome shave; Waste recycling; Sound absorption coefficient; JCA model

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This paper presents the sound absorption performance of natural fiber composites developed from chrome shave (CS) and coffee silver skin (CSS), showing promising results, especially above 1 kHz in frequency range.
This paper presents the sound absorption performance of natural fiber composites developed from chrome shave (CS) and coffee silver skin (CSS). Twelve test samples of thickness 30 mm and 50 mm were fabricated with different fiber sizes and fiber ratios and by maintaining the density of the samples by 150 kg/m(3). Normal incidence sound absorption coefficient spectra were measured in an impedance tube. Absorption coefficient spectra were predicted using the Johnson-Allard-Champoux (JCA) model using best fit values of tortuosity and the two characteristic lengths together with measured values of porosity and flow resistivity. The results revealed that the CS-CSS composite had average absorption coefficient of 0.95 above 1 kHz for a thickness of 30 mm and 50 mm. 'The predictions and data are in good agreement up to 6 kHz. (C) 2021 Elsevier Ltd. All rights reserved.

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