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A semi-empirical model to predict the acoustic behaviour of fully and partially reticulated polyurethane foams based on microstructure properties

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Doutres, Olivier and Atalla, N.. 2012. « A semi-empirical model to predict the acoustic behaviour of fully and partially reticulated polyurethane foams based on microstructure properties ». In Proceedings of the Acoustics 2012 Nantes Conference : 11th Congrès Français d'Acoustique : 2012 IOA annual meeting (Nantes, France, Apr. 23-27, 2014), pp. 1955-1960. Société Française d'Acoustique.

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Abstract

This work investigates the links between the microstructure of polyurethane foams and their sound absorbing efficiency, and more specifically the effect of membranes closing the cells. In a previous work, the authors proposed a semi-empirical approach to link the foam microstructure properties, i.e. reticulation rate, strut length and thickness, with its non-acoustic parameters. The study was based on the complete characterization of 15 isotropic polyurethane foams with various cell sizes and reticulation rates (i.e. open pore content). This paper proposes a validation of this semi-empirical model using 3 new polyurethane foams, not used in the first characterization set. More importantly, a simplification is presented to account only for the foam cell size and reticulation rate. Non-acoustic parameters estimated by the micro/macro links are also compared to direct and indirect measurements. It is shown that the proposed expressions associated to the Johnson-Champoux-Allard porous model allow for a good estimation of the sound absorbing behaviour of all tested polyurethane foams, fully reticulated or not.

Item Type: Conference proceeding
Professor:
Professor
Doutres, Olivier
Affiliation: Autres
Date Deposited: 29 Oct 2014 18:00
Last Modified: 07 Nov 2017 18:52
URI: http://espace2.etsmtl.ca/id/eprint/8805

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