Modeling sound absorption of micro-perforates panel using wave propagation method

A micro-perforated panel (MPP) absorber has been known widely as an alternative absorber to the conventional fibrous type acoustic material. The MPP system is arranged with distance from a rigid wall to provide an air gap layer. Several theoretical approaches to predict the sound absorption of the M...

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Main Author:	Py, Muhammad Sajidin
Format:	Thesis
Language:	English English
Published:	2015
Subjects:	Q Science (General) QC Physics
Online Access:	http://eprints.utem.edu.my/id/eprint/16880/1/Modeling%20Sound%20Absorption%20Of%20Micro-Perforates%20Panel%20Using%20Wave%20Propagation%20Method.pdf http://eprints.utem.edu.my/id/eprint/16880/2/Modeling%20sound%20absorption%20of%20micro-perforates%20panel%20using%20wave%20propagation%20method.pdf
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id	my-utem-ep.16880
record_format	uketd_dc
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 Py, Muhammad Sajidin Modeling sound absorption of micro-perforates panel using wave propagation method
description	A micro-perforated panel (MPP) absorber has been known widely as an alternative absorber to the conventional fibrous type acoustic material. The MPP system is arranged with distance from a rigid wall to provide an air gap layer. Several theoretical approaches to predict the sound absorption of the MPP have been published. In particular for the double MPPs, approximate expression for the air gap impedance is used which yields deviation in the result when it is compared with the experiment. In this study, wave propagation technique is proposed to represent the behaviour of sound incident and reflected in the MPP system. The motion of the MPP is also included in the model. The proposed models provide an attractive technique to predict the sound absorption as well as the transmission and reflection. The MPP can be set to be a solid panel by adjusting the impedance of the holes to infinity and the solid panel can be turned into a rigid wall by setting the panel impedance to infinity. The model can be applied for the single MPP and multi-layer MPPs; a stand-alone system without rigid wall as well as the system backed with a rigid wall. The results for the MPP system backed by a rigid wall then is compared with experimental data. It is found that the result from the wave propagation technique has a better good agreement with the experiment at higher frequency.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Py, Muhammad Sajidin
author_facet	Py, Muhammad Sajidin
author_sort	Py, Muhammad Sajidin
title	Modeling sound absorption of micro-perforates panel using wave propagation method
title_short	Modeling sound absorption of micro-perforates panel using wave propagation method
title_full	Modeling sound absorption of micro-perforates panel using wave propagation method
title_fullStr	Modeling sound absorption of micro-perforates panel using wave propagation method
title_full_unstemmed	Modeling sound absorption of micro-perforates panel using wave propagation method
title_sort	modeling sound absorption of micro-perforates panel using wave propagation method
granting_institution	Universiti Teknikal Malaysia Melaka
granting_department	Faculty Of Mechanical Engineering
publishDate	2015
url	http://eprints.utem.edu.my/id/eprint/16880/1/Modeling%20Sound%20Absorption%20Of%20Micro-Perforates%20Panel%20Using%20Wave%20Propagation%20Method.pdf http://eprints.utem.edu.my/id/eprint/16880/2/Modeling%20sound%20absorption%20of%20micro-perforates%20panel%20using%20wave%20propagation%20method.pdf
_version_	1747833906916229120
spelling	my-utem-ep.168802022-06-07T13:46:51Z Modeling sound absorption of micro-perforates panel using wave propagation method 2015 Py, Muhammad Sajidin Q Science (General) QC Physics A micro-perforated panel (MPP) absorber has been known widely as an alternative absorber to the conventional fibrous type acoustic material. The MPP system is arranged with distance from a rigid wall to provide an air gap layer. Several theoretical approaches to predict the sound absorption of the MPP have been published. In particular for the double MPPs, approximate expression for the air gap impedance is used which yields deviation in the result when it is compared with the experiment. In this study, wave propagation technique is proposed to represent the behaviour of sound incident and reflected in the MPP system. The motion of the MPP is also included in the model. The proposed models provide an attractive technique to predict the sound absorption as well as the transmission and reflection. The MPP can be set to be a solid panel by adjusting the impedance of the holes to infinity and the solid panel can be turned into a rigid wall by setting the panel impedance to infinity. The model can be applied for the single MPP and multi-layer MPPs; a stand-alone system without rigid wall as well as the system backed with a rigid wall. The results for the MPP system backed by a rigid wall then is compared with experimental data. It is found that the result from the wave propagation technique has a better good agreement with the experiment at higher frequency. 2015 Thesis http://eprints.utem.edu.my/id/eprint/16880/ http://eprints.utem.edu.my/id/eprint/16880/1/Modeling%20Sound%20Absorption%20Of%20Micro-Perforates%20Panel%20Using%20Wave%20Propagation%20Method.pdf text en public http://eprints.utem.edu.my/id/eprint/16880/2/Modeling%20sound%20absorption%20of%20micro-perforates%20panel%20using%20wave%20propagation%20method.pdf text en validuser https://plh.utem.edu.my/cgi-bin/koha/opac-detail.pl?biblionumber=96140 mphil masters Universiti Teknikal Malaysia Melaka Faculty Of Mechanical Engineering Putra, Azma 1. Arenas, J. and Crocker, 2013. Recent Trends in Porous Sound-Absorbing Materials. [on- line] Available at : http://www.sandv.com/downloads/1007croc.pdf, Accessed on 25 August 2013. 2. Asdrubali, F., 2006. Survey on the acoustical properties of new sustainable materials for noise control. 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Modeling sound absorption of micro-perforates panel using wave propagation method

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