RADIATION EFFICIENCY OF A PERFORATED PANEL MODELLED USING ELEMENTARY SOURCE TECHNIQUE
A perforate is often used in practical engineering noise control to reduce sound radiation from a vibrating structure. This paper presents a prediction model to quantify this effect using elementary sources which can take account of the hole size and distribution across the plate surface. The mod...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute of Acoustics and Vibration
2013
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/8881/1/ICSV20_PerforatedPanel_Putra.pdf http://eprints.utem.edu.my/id/eprint/8881/ http://www.icsv20.org/ |
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| Summary: | A perforate is often used in practical engineering noise control to reduce sound radiation from
a vibrating structure. This paper presents a prediction model to quantify this effect using elementary
sources which can take account of the hole size and distribution across the plate
surface. The model is based on discretization of the Rayleigh formula where a plate set in an
infinite rigid baffle is divided into array of elementary source. A matrix of acoustic impedance
as a function of acoustic pressure due to motion of the corresponding elementary source and
other surrounding sources is assembled. The total sound power is determined from the summation
over the power contributions from all elementary sources. The results show that the
radiation efficiency reduces as the perforation ratio is increased or the hole size is reduced. |
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