Lepironia articulata as a sustainable acoustic absorber

Ahmad Shafii, Nur Hidayah and Zainulabidin, Muhd Hafeez (2021) Lepironia articulata as a sustainable acoustic absorber. Research Progress in Mechanical and Manufacturing Engineering, 2 (2). pp. 201-212. ISSN 2773-4765

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Lepironia articulata; sound absorption coefficient; sound absorber
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Mechanical and Manufacturing Engineering
Depositing User:	Mr. Abdul Rahim Mat Radzuan
Date Deposited:	14 Jun 2022 02:13
Last Modified:	14 Jun 2022 02:13
URI:	http://eprints.uthm.edu.my/id/eprint/7169

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