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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Main Authors: | , , |
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Format: | Conference or Workshop Item |
Language: | English |
Published: |
Universiti Teknikal Malaysia Melaka
2012
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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. |
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