Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Putra, Azma and Ismail, Ahmad Yusuf (2014) Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes. Advances in Acoustics and Vibration. pp. 1-12. ISSN 1687-627X

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Abstract

his paper studies the sound transmission loss of perforated panels and investigates the efect of the hole diameter on the sound insulation performance under normal incidence of acoustic loading. he hole diameters are distinguished into micro (submillimeter) and macro (millimeter) sizes. In general, the transmission loss reduces as the perforation ratio is increased. However, by retaining the perforation ratio, it is found that the transmission loss increases as the hole diameter is reduced for a perforate with micro holes due to the efect of resistive part in the hole impedance, which is contrary to the results for those with the macro holes. Both show similar trend at high frequency where the luid behavior inside the hole is inertial. Simple analytical formulae for engineering purpose are provided. Validation of the models with measurement data also gives good agreement.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering Technology > Department of Mechanical Engineering Technology
Depositing User: Dr Azma Putra
Date Deposited: 14 May 2014 01:55
Last Modified: 28 May 2015 04:23
URI: http://eprints.utem.edu.my/id/eprint/12225
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