INSERTION OF A MICRO-PERFORATED PANEL TO IMPROVE SOUND TRANSMISSION LOSS OF A DOUBLE-LEAF PARTITION

Over decades a double-leaf partition in engineering structures has been widely applied for its advantages i.e. in terms of the mechanical strength and toughness as well as its lightweight property. For noise control application, the double-leaf has also been known to be an effective noise barri...

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Bibliographic Details
Main Authors: Putra, Azma, Ismail, Ahmad Yusuf, Ayob, Md Razali
Format: Conference or Workshop Item
Language:English
Published: Universiti Teknikal Malaysia Melaka 2012
Subjects:
Online Access:http://eprints.utem.edu.my/id/eprint/8894/2/INSERTION_OF_A_MICRO-PERFORATED_PANEL_TO_IMPROVE.pdf
http://eprints.utem.edu.my/id/eprint/8894/
http://icei2012.utem.edu.my/
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Summary:Over decades a double-leaf partition in engineering structures has been widely applied for its advantages i.e. in terms of the mechanical strength and toughness as well as its lightweight property. For noise control application, the double-leaf has also been known to be an effective noise barrier. Unfortunately at resonance frequency, the sound transmission loss (TL) reduces significantly due to the coupling between the panels and the air between them. This paper investigates the effect of a micro-perforated panel (MPP) inserted inside a double-leaf partition to improve the TL performance at the troublesome resonance frequency of a conventional double-leaf structure. It is found that the TL improves at the resonance if the MPP is located closer to the solid panel. The mathematical model is derived for normal incidence of acoustic loading.