Three-microphone two-cavity method for measuring sound transmission loss in a modified impedance tube

Salissou, Yacoubou, Panneton, Raymond and Doutres, Olivier. 2011. « Three-microphone two-cavity method for measuring sound transmission loss in a modified impedance tube ». [Conference paper]. Canadian Acoustics = Acoustique Canadienne, vol. 39, nº 3. pp. 16-17.
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Abstract

The normal incidence sound transmission loss (nSTL) is an important indicator to assess the sound insulation property of acoustic materials. The apparatus consists of a finite length rigid walled impedance tube with circularly shaped and uniform inner cross-section. The tube features a loudspeaker at one end and a movable piston at the other end. The loudspeaker is used to generate a plane wave field in the impedance tube. There are two microphones flush mounted upstream the test sample and one microphone flush mounted on the rigid end. Next, a 20-mm thick step discontinuity seeing as a non-symmetrical sample is tested and compared to the standard 4M2L method and 3M-TMTC method. One can note that similar results are obtained between the 3M2L and 4M2L methods, however 4M2L is noisier compared to 3M2L.

Item Type:	Peer reviewed article published in a journal
Additional Information:	Acoustics Week in Canada 2011, annual conference of the Canadian Acoustical Association
Professor:	Professor Doutres, Olivier
Affiliation:	Autres
Date Deposited:	29 Oct 2014 17:54
Last Modified:	24 Aug 2017 19:09
URI:	https://espace2.etsmtl.ca/id/eprint/8817

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