Sound Absorption Performance Of Natural Kenaf Fibres
In recent years, kenaf fibre has been highlighted for its superiority as the filler for composite materials. However, study of the fibres as an acoustic absorber is still lacking. In this paper, the sound absorption of kenaf fibre specimens are studied both under normal and random sound incidence....
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | en |
| Published: |
Elsevier Ltd.
2017
|
| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/20875/2/Kenaf-APAC2017.pdf http://eprints.utem.edu.my/id/eprint/20875/ https://www.sciencedirect.com/science/article/pii/S0003682X17305583?via%3Dihub http://dx.doi.org/10.1016/j.apacoust.2017.09.012 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In recent years, kenaf fibre has been highlighted for its superiority as the filler for composite materials. However,
study of the fibres as an acoustic absorber is still lacking. In this paper, the sound absorption of kenaf fibre
specimens are studied both under normal and random sound incidence. The normal-incidence sound absorption
coefficient measurement was conducted using the impedance tube method. The effects of thickness involving full
fibre and air-fibre specimen and the effect of bulk density were discussed. For the random-incidence sound
absorption coefficient, the test was conducted in a reverberation chamber. From both methods, the results in
general reveal that for bulk density of 140–150 kg/m3 and thickness of 25–30 mm, the absorption coefficient is
above 0.5 starting from 500 Hz and can reach 0.85 on average above 1.5 kHz. These frequency bandwidth of
absorption and the level of absorption coefficient improve significantly when bulk density and thickness are
increased. Additional air gap also improve the absorption toward lower frequency. |
|---|