Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber

Micro-perforated panel (MPP) absorber is increasingly gaining more popularity in noise control as a sound absorber given its facile installation, long durability, environmental friendliness and attractive appearance and as an alternative to the classical porous acoustics materials. A single MPP abso...

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Main Author:	Mosa, Ali Ibrahim
Format:	Thesis
Language:	English English
Published:	2021
Subjects:	Q Science (General) QC Physics
Online Access:	http://eprints.utem.edu.my/id/eprint/25444/1/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf http://eprints.utem.edu.my/id/eprint/25444/2/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf
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institution	Universiti Teknikal Malaysia Melaka
collection	UTeM Repository
language	English English
advisor	Putra, Azma
topic	Q Science (General) QC Physics
spellingShingle	Q Science (General) QC Physics Mosa, Ali Ibrahim Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
description	Micro-perforated panel (MPP) absorber is increasingly gaining more popularity in noise control as a sound absorber given its facile installation, long durability, environmental friendliness and attractive appearance and as an alternative to the classical porous acoustics materials. A single MPP absorber typically features a Helmholtz resonator with a high absorption amplitude, but narrow absorption bandwidth. The main objective of this study is to obtain a wider sound absorption bandwidth by proposing an inhomogeneous perforation technique. The first step is to study the acoustic performance of a single layer MPP containing holes of two different sizes and ratios and with multiple cavity depths. Thereafter, for more improvement of the absorption bandwidth, this single MPP is cascaded with another single MPP to form a double-layer MPP model of inhomogeneous perforation. Mathematical models based on the equivalent electrical circuit method are proposed, and the absorption coefficient is calculated under a normal incidence of sound. The results show that the introduction of inhomogeneous perforation technique improves the absorption performance of the single layer MPP absorber compared to the homogenous one, especially with multi-cavity depths. The MPP layer should consist of two sets of perforation parameters set in an equal arrangement in two sub MPP areas; one of smaller perforation ratio with large hole diameter and the other of larger perforation ratio with smaller hole diameter. The proposed double layer inhomogeneous MPP model exhibits significantly wider sound absorption bandwidth and higher sound absorption amplitude than that of the conventional double-layer and even triple-layer homogeneous MPPs. The results demonstrate that the absorption bandwidth can be effectively controlled to higher frequencies region by reducing the air cavity between the two inhomogeneous MPP layers, and by decreasing the cavity depth behind the sub-MPP with small hole diameter and high perforation ratio. For the low frequency improvement, this can be achieved by increasing the cavity depth behind the sub-MPP with large hole diameter-small perforation ratio. The theoretical results were validated with the experiments by using the impedance tube method with a good agreement. This study also presents an empirical mathematical model for the single layer, multi cavity inhomogeneous MPP to conveniently obtain the required MPP parameters to have the halfabsorption bandwidth of absorption coefficient.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mosa, Ali Ibrahim
author_facet	Mosa, Ali Ibrahim
author_sort	Mosa, Ali Ibrahim
title	Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
title_short	Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
title_full	Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
title_fullStr	Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
title_full_unstemmed	Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber
title_sort	modelling the acoustic performance of inhomogeneous micro-perforated panel absorber
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty Of Mechanical Engineering
publishDate	2021
url	http://eprints.utem.edu.my/id/eprint/25444/1/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf http://eprints.utem.edu.my/id/eprint/25444/2/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf
_version_	1747834129752260608
spelling	my-utem-ep.254442021-12-10T16:44:01Z Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber 2021 Mosa, Ali Ibrahim Q Science (General) QC Physics Micro-perforated panel (MPP) absorber is increasingly gaining more popularity in noise control as a sound absorber given its facile installation, long durability, environmental friendliness and attractive appearance and as an alternative to the classical porous acoustics materials. A single MPP absorber typically features a Helmholtz resonator with a high absorption amplitude, but narrow absorption bandwidth. The main objective of this study is to obtain a wider sound absorption bandwidth by proposing an inhomogeneous perforation technique. The first step is to study the acoustic performance of a single layer MPP containing holes of two different sizes and ratios and with multiple cavity depths. Thereafter, for more improvement of the absorption bandwidth, this single MPP is cascaded with another single MPP to form a double-layer MPP model of inhomogeneous perforation. Mathematical models based on the equivalent electrical circuit method are proposed, and the absorption coefficient is calculated under a normal incidence of sound. The results show that the introduction of inhomogeneous perforation technique improves the absorption performance of the single layer MPP absorber compared to the homogenous one, especially with multi-cavity depths. The MPP layer should consist of two sets of perforation parameters set in an equal arrangement in two sub MPP areas; one of smaller perforation ratio with large hole diameter and the other of larger perforation ratio with smaller hole diameter. The proposed double layer inhomogeneous MPP model exhibits significantly wider sound absorption bandwidth and higher sound absorption amplitude than that of the conventional double-layer and even triple-layer homogeneous MPPs. The results demonstrate that the absorption bandwidth can be effectively controlled to higher frequencies region by reducing the air cavity between the two inhomogeneous MPP layers, and by decreasing the cavity depth behind the sub-MPP with small hole diameter and high perforation ratio. For the low frequency improvement, this can be achieved by increasing the cavity depth behind the sub-MPP with large hole diameter-small perforation ratio. The theoretical results were validated with the experiments by using the impedance tube method with a good agreement. This study also presents an empirical mathematical model for the single layer, multi cavity inhomogeneous MPP to conveniently obtain the required MPP parameters to have the halfabsorption bandwidth of absorption coefficient. 2021 Thesis http://eprints.utem.edu.my/id/eprint/25444/ http://eprints.utem.edu.my/id/eprint/25444/1/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf text en public http://eprints.utem.edu.my/id/eprint/25444/2/Modelling%20The%20Acoustic%20Performance%20Of%20Inhomogeneous%20Micro-Perforated%20Panel%20Absorber.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=119734 phd doctoral Universiti Teknikal Malaysia Melaka Faculty Of Mechanical Engineering Putra, Azma 1. Allam, S. and Åbom, M., 2011. A New Type of Muffler Based on Microperforated Tubes. Journal of Vibration and Acoustics, 133 (3), p.031005. 2. Asdrubali, F. and Pispola, G., 2007. 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Modelling The Acoustic Performance Of Inhomogeneous Micro-Perforated Panel Absorber

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