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Optimization of the acoustic performance of polyimide foams

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Doutres, Olivier and Atalla, Noureddine and Wulliman, Rebecca and Ferguson, Shari and Bailey, Steve. 2011. « Optimization of the acoustic performance of polyimide foams ». In INTER-NOISE and NOISE-CON Congress and Conference Proceedings, NoiseCon11 (Portland, OR, USA, July 25-27, 2011), pp. 339-349. Institute of Noise Control Engineering - USA.

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Abstract

Due to their low weight, high fire resistance and good mechanical strength, SOLIMIDE® Polyimide foams are good candidates for sound packages in aerospace sound transmission applications. However, their high resistance to airflow limits the sound absorption efficiency inside a double wall structure and thus the sound transmission loss of the structure. The paper discusses two concepts to improve the transmission efficiency of such materials for double wall applications: (i) improving its sound absorption behavior by removing mechanically or chemically the cell membranes and thus decreasing both the flow resistance and tortuosity, (ii) coupling the Polyimide foams to screens (porous or impervious) to improve the transmission loss in targeted frequency bands.

Item Type: Conference proceeding
Additional Information: 25th National Conference on Noise Control Engineering 2011 (Noise-Con 11)
Professor:
Professor
Doutres, Olivier
Affiliation: Autres
Date Deposited: 29 Oct 2014 18:00
Last Modified: 25 Sep 2017 20:00
URI: http://espace2.etsmtl.ca/id/eprint/8807

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