Sound Insulation Performance Of Kenaf Fibre As A Noise Control Treatment In Car Using Statistical Energy Analysis

Azahari, Norzailan and Putra, Azma and Mat Dan, Reduan and Othman, Muhammad Nur (2019) Sound Insulation Performance Of Kenaf Fibre As A Noise Control Treatment In Car Using Statistical Energy Analysis. Defence S And T Technical Bulletin, 12 (1). 126 - 139. ISSN 1985-6571

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Transmission loss, statistical energy analysis (SEA), kenaf, parameters, natural fibre
Divisions:	Faculty of Mechanical Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	07 Aug 2020 09:21
Last Modified:	07 Aug 2020 09:21
URI:	http://eprints.utem.edu.my/id/eprint/24185
Statistic Details:	View Download Statistic

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