Normal incidence of sound transmission loss of a double-leaf partition inserted with a micro-perforated panel

Putra, Azma and Ismail, Ahmad Yusuf and ramlan, roszaidi and Ayob, Md Razali (2013) Normal incidence of sound transmission loss of a double-leaf partition inserted with a micro-perforated panel. Advance in Acoustics and Vibration. pp. 1-24. ISSN 1687-627X (In Press)

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Abstract

A double-leaf partition in engineering structures has been widely applied for its advantages i.e. in terms of its mechanical strength as well as its lightweight property. In noise control, the double-leaf also serves to be an effective noise barrier. Unfortunately at low frequency, the sound transmission loss reduces significantly due to the coupling between the panels and the air between them. This paper studies the effect of a micro-perforated panel (MPP) inserted inside a double-leaf partition on the sound transmission loss performance of the system. The MPP insertion is proposed to provide a hygienic double-leaf noise insulator replacing the classical abrasive porous materials between the panels. It is found that the transmission loss improves at the troublesome mass-air-mass resonant frequency if the MPP is located closer to the solid panel. The mathematical model is derived for normal incidence of acoustic loading.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Mechanical Engineering > Department of Structure and Materials
Depositing User: Dr Azma Putra
Date Deposited: 19 Aug 2013 08:51
Last Modified: 28 May 2015 04:02
URI: http://eprints.utem.edu.my/id/eprint/9218
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