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Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia

Noise is often viewed as unwanted or excess sound which can be harmful to the human health. In order to filter all the unwanted noise, sound absorbers are invented. Sound absorbers are usually made up of sound absorbing materials which retains the excess sound by converting the sound energy into hea...

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Main Author: Logan A / l Balloo
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Published: 2023
Subjects:
Acoustic performance
Natural fiber
Sound absorbers
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spelling my.uniten.dspace-213422023-05-04T18:53:58Z Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia Logan A / l Balloo Acoustic performance Natural fiber Sound absorbers Noise is often viewed as unwanted or excess sound which can be harmful to the human health. In order to filter all the unwanted noise, sound absorbers are invented. Sound absorbers are usually made up of sound absorbing materials which retains the excess sound by converting the sound energy into heat energy and are released into the surrounding. However, most of the sound absorbers are made up of synthetic fibres which are proven to be hazardous to human health. This phenomenon influenced the motive to carry out this project which is the drive to fabricate sound absorbing materials which consists of natural fibres of Oil Palm Frond and Acacia Mangium. This project has investigate the density effect on the morphology and the sound absorbing properties of low density fibreboards in thickness of 16mm. The low density fibreboards are developed by implementing the fabrication process which includes several steps such as chipping, refining and many more. As for the microstructure and the acoustic properties, they are determined when all the samples undergo Scanning Electron Microscope (SEM) testing and Impedance Tube (BNK Tube) method respectively. From the results, it can be viewed that from 0 to 2500Hz, the Sound Absorption Coefficient (SAC) values in average increases as the density increases. From 2500Hz to 4500Hz, the SAC values in average are seen to be increasing as the density decreases. Since the densities are quite close to each other, the SAC values does not fluctuate vigorously when compared to each one and another. The SAC values of all the samples can also be seen to be reaching unity from 4500Hz to 6400Hz (0.95~0.99). In terms of morphology, it can be seen that when the density increases, the content of parenchyma increases which is one of the key components in retaining sound waves. The results shows and validates that the natural fibres of Oil Palm Frond and Acacia Mangium is a good mixture and can be used as an alternative material to be used in sound absorbers 2023-05-03T16:38:09Z 2023-05-03T16:38:09Z 2020-02 https://irepository.uniten.edu.my/handle/123456789/21342 application/pdf
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
topic Acoustic performance
Natural fiber
Sound absorbers
spellingShingle Acoustic performance
Natural fiber
Sound absorbers
Logan A / l Balloo
Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
description Noise is often viewed as unwanted or excess sound which can be harmful to the human health. In order to filter all the unwanted noise, sound absorbers are invented. Sound absorbers are usually made up of sound absorbing materials which retains the excess sound by converting the sound energy into heat energy and are released into the surrounding. However, most of the sound absorbers are made up of synthetic fibres which are proven to be hazardous to human health. This phenomenon influenced the motive to carry out this project which is the drive to fabricate sound absorbing materials which consists of natural fibres of Oil Palm Frond and Acacia Mangium. This project has investigate the density effect on the morphology and the sound absorbing properties of low density fibreboards in thickness of 16mm. The low density fibreboards are developed by implementing the fabrication process which includes several steps such as chipping, refining and many more. As for the microstructure and the acoustic properties, they are determined when all the samples undergo Scanning Electron Microscope (SEM) testing and Impedance Tube (BNK Tube) method respectively. From the results, it can be viewed that from 0 to 2500Hz, the Sound Absorption Coefficient (SAC) values in average increases as the density increases. From 2500Hz to 4500Hz, the SAC values in average are seen to be increasing as the density decreases. Since the densities are quite close to each other, the SAC values does not fluctuate vigorously when compared to each one and another. The SAC values of all the samples can also be seen to be reaching unity from 4500Hz to 6400Hz (0.95~0.99). In terms of morphology, it can be seen that when the density increases, the content of parenchyma increases which is one of the key components in retaining sound waves. The results shows and validates that the natural fibres of Oil Palm Frond and Acacia Mangium is a good mixture and can be used as an alternative material to be used in sound absorbers
format
author Logan A / l Balloo
author_facet Logan A / l Balloo
author_sort Logan A / l Balloo
title Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
title_short Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
title_full Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
title_fullStr Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
title_full_unstemmed Acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
title_sort acoustic performance of natural fibres of oil palm frond ( 30%) and acasia
publishDate 2023
_version_ 1806425955578675200
score 13.222552

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