Lepironia articulata as a sustainable acoustic absorber
Lepironia articulata is found abundant in a swamp and along streams in West Malaysia and it is commonly used for grey water treatment, numerous traditional craft and now commercialise as an organic straw. However, there is a scarcity of knowledge on the physical and acoustical properties of th...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
UTHM Publishing
2021
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/7169/1/P13857_eec60094440b510c284f4556df0a7217.pdf http://eprints.uthm.edu.my/7169/ https://doi.org/10.30880/rpmme.2021.02.02.024 |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English |
| Summary: | Lepironia articulata is found abundant in a swamp and along streams in
West Malaysia and it is commonly used for grey water treatment, numerous
traditional craft and now commercialise as an organic straw. However, there is a
scarcity of knowledge on the physical and acoustical properties of this natural fibre.
Therefore, this study was to determine the potential of Lepironia articulata as
acoustic absorber. The absorption coefficient was tested using the impedance tube
method (ASTM E1050-98) for four different structure arrangements, namely “axial”,
“horizontal”, “crossed” and “combination” made up of Lepironia articulata with the
diameter ranging from 2 to 4 mm and 4 to 7 mm respectively and the thickness
remains at 50 mm. The influence of air gap of 0 to 25 mm, in 5 mm increment was
introduced in each sample and other physical properties such as density, porosity and
tortuosity were investigated. The results revealed that the Lepironia articulata in
horizontal, crossed and combination arrangements showed greatest absorption
performance especially in the low frequency range compared to the axial
arrangement. If compared between samples with the range diameter of 4 to 7 mm and
2 to 4 mm, bigger stalks diameter in axial arrangement exhibits the least NRC value.
Next, air gaps have great influence at low frequency range whereby it shifted the
peaks and sound absorption coefficient curve toward lower frequency. Sound
absorption coefficient increases as porosity increase and decrease as density�tortuosity increase. Overall, Lepironia articulata has the potential to be used as a
sustainable acoustic absorber as all the samples has the NRC value more than or equal
to 0.20. |
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