Acoustical characteristics of oil palm mesocarp fibres

Natural fibres are availability biomass, plentiful in agricultural waste and eco�friendly materials. Currently, it is become the major reasons for emerging renewable materials in sustainable technology. Therefore, this study discusses the acoustical characteristics of agro-waste biomass fibres f...

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Main Author:	Abd Latif, Hanif
Format:	Thesis
Language:	English English
Published:	2016
Subjects:	TD878-894 Special types of environment Including soil pollution air pollution noise pollution
Online Access:	http://eprints.uthm.edu.my/750/1/24p%20HANIF%20ABD%20LATIF.pdf http://eprints.uthm.edu.my/750/2/HANIF%20ABD%20LATIF%20WATERMARK.pdf
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spelling	my-uthm-ep.7502021-08-30T07:49:30Z Acoustical characteristics of oil palm mesocarp fibres 2016-10 Abd Latif, Hanif TD878-894 Special types of environment, Including soil pollution, air pollution, noise pollution Natural fibres are availability biomass, plentiful in agricultural waste and eco�friendly materials. Currently, it is become the major reasons for emerging renewable materials in sustainable technology. Therefore, this study discusses the acoustical characteristics of agro-waste biomass fibres from oil palm Mesocarp as fibrous acoustic material. Incorporated polyurethane (PU) had improved the sound absorption coefficient (SAC), especially at low frequency range. The oil palm Mesocarp fibres were mixed with four different percentages of PU, namely 10%, 20%, 30% and 40%. The measurement of SAC was done using an impedance tube method (ITM). Moreover, there were two analytical models which are Delany�Bazley model and Johnson-Champoux-Allard model to validate the experimental outcomes. There were several internal characteristics of the prepared samples investigated namely flow resistivity, porosity, tortuosity, characteristic lengths, fibre diameter, air gaps and thickness of sample. The flow resistivity, tortuosity, fibre diameter, density of samples and characteristic lengths tend to increase with percentage of PU binder. But, porosity was slightly decrease by adding more binder into the sample. This study confirms that by increasing the thickness of samples, the SAC were improved. Air gaps had great influence in adjusting amount of low frequency range and moved the peaks toward lower frequency. The internal characteristics have a positive and significant effect on Noise Reduction Coefficient (NRC). The sample with 10% PU binder showed the greatest sound absorption performance in most of low to mid frequency range and demonstrated highest value of NRC of 0.66. Besides, sample with 20% PU binder demonstrated optimum SAC which is very close to 1 at 1000 Hz. There is still space to improve the performance of the Delany-Bazley Model, especially for natural fibre. Besides, the Johnson�Champoux-Allard model gives similar pattern of graph to ITM results and the model predicts very well with better fit to acoustic behaviour. 2016-10 Thesis http://eprints.uthm.edu.my/750/ http://eprints.uthm.edu.my/750/1/24p%20HANIF%20ABD%20LATIF.pdf text en public http://eprints.uthm.edu.my/750/2/HANIF%20ABD%20LATIF%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English
topic	TD878-894 Special types of environment Including soil pollution air pollution noise pollution
spellingShingle	TD878-894 Special types of environment Including soil pollution air pollution noise pollution Abd Latif, Hanif Acoustical characteristics of oil palm mesocarp fibres
description	Natural fibres are availability biomass, plentiful in agricultural waste and eco�friendly materials. Currently, it is become the major reasons for emerging renewable materials in sustainable technology. Therefore, this study discusses the acoustical characteristics of agro-waste biomass fibres from oil palm Mesocarp as fibrous acoustic material. Incorporated polyurethane (PU) had improved the sound absorption coefficient (SAC), especially at low frequency range. The oil palm Mesocarp fibres were mixed with four different percentages of PU, namely 10%, 20%, 30% and 40%. The measurement of SAC was done using an impedance tube method (ITM). Moreover, there were two analytical models which are Delany�Bazley model and Johnson-Champoux-Allard model to validate the experimental outcomes. There were several internal characteristics of the prepared samples investigated namely flow resistivity, porosity, tortuosity, characteristic lengths, fibre diameter, air gaps and thickness of sample. The flow resistivity, tortuosity, fibre diameter, density of samples and characteristic lengths tend to increase with percentage of PU binder. But, porosity was slightly decrease by adding more binder into the sample. This study confirms that by increasing the thickness of samples, the SAC were improved. Air gaps had great influence in adjusting amount of low frequency range and moved the peaks toward lower frequency. The internal characteristics have a positive and significant effect on Noise Reduction Coefficient (NRC). The sample with 10% PU binder showed the greatest sound absorption performance in most of low to mid frequency range and demonstrated highest value of NRC of 0.66. Besides, sample with 20% PU binder demonstrated optimum SAC which is very close to 1 at 1000 Hz. There is still space to improve the performance of the Delany-Bazley Model, especially for natural fibre. Besides, the Johnson�Champoux-Allard model gives similar pattern of graph to ITM results and the model predicts very well with better fit to acoustic behaviour.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Abd Latif, Hanif
author_facet	Abd Latif, Hanif
author_sort	Abd Latif, Hanif
title	Acoustical characteristics of oil palm mesocarp fibres
title_short	Acoustical characteristics of oil palm mesocarp fibres
title_full	Acoustical characteristics of oil palm mesocarp fibres
title_fullStr	Acoustical characteristics of oil palm mesocarp fibres
title_full_unstemmed	Acoustical characteristics of oil palm mesocarp fibres
title_sort	acoustical characteristics of oil palm mesocarp fibres
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2016
url	http://eprints.uthm.edu.my/750/1/24p%20HANIF%20ABD%20LATIF.pdf http://eprints.uthm.edu.my/750/2/HANIF%20ABD%20LATIF%20WATERMARK.pdf
_version_	1747830673851285504

Acoustical characteristics of oil palm mesocarp fibres

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