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An additional configuration to standard ASTM E2611-09 for measuring the normal incidence sound transmission loss in a modified impedance tube

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Doutres, Olivier and Panneton, R. and Salissou, Y.. 2012. « An additional configuration to standard ASTM E2611-09 for measuring the normal incidence sound transmission loss in a modified impedance tube ». In Proceedings of the Acoustics 2012 Nantes Conference : 11th Congrès Français d'Acoustique : 2012 IOA annual meeting (Nantes, France, Apr. 23-27, 2014), pp. 2029-2033. Société Française d'Acoustique.

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Abstract

This paper presents a three-microphone two-load (3M2L) method for measuring the normal incidence sound transmission loss of a noise control system or material in a modified impedance tube. In the standard ASTM E2611-09, the downstream section of the impedance tube includes two microphones flush with the interior surface of the tube and the proposed four-microphone two-load (4M2L) method to assess the normal incidence sound transmission loss requires the use of two arbitrary acoustic terminations. The method presented here is conceptually identical but (i) the downstream section is reduced to a simple movable rigid backing with one microphone flush mounted on it and (ii) the two arbitrary acoustic terminations are replaced by two air cavities. It thus requires one microphone less and fewer transfer functions. The standard switching technique used to correct the variations between the three microphones is validated on a symmetrical air layer. The proposed 3M2L method is then applied to a non-symmetrical specimen and validated compared to the standard 4M2L method.

Item Type: Conference proceeding
Professor:
Professor
Doutres, Olivier
Affiliation: Autres
Date Deposited: 29 Oct 2014 17:53
Last Modified: 07 Nov 2017 18:58
URI: http://espace2.etsmtl.ca/id/eprint/8811

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