Modeling porous-elastic materials in periodically mount connected double panel partitions

In aeronautic double panel partitions, the trim panel (interior panel) is usually attached to the ring frames that are ribbed to the skin panel (exterior panel) with periodically spaced resilient mounts. Moreover, porous-elastic materials are inserted in the cavity between these panels to provide ab...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2009-10, Vol.126 (4_Supplement), p.2298-2298
Main Authors: Legault, Julien, Atalla, Noureddine
Format: Article
Language:English
Online Access:Get full text
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Summary:In aeronautic double panel partitions, the trim panel (interior panel) is usually attached to the ring frames that are ribbed to the skin panel (exterior panel) with periodically spaced resilient mounts. Moreover, porous-elastic materials are inserted in the cavity between these panels to provide absorption. Due to their periodic nature, these partitions allow the use of space-harmonic expansion formulations for their vibration and sound transmission analysis. This paper shows how equivalent fluid and porous-elastic models can be incorporated in such formulations to assess the influence of sound absorbing materials. The equations of the model are derived and simulation results are presented for materials providing different absorptions. Application is focused on the relative effects of absorption versus the mounts’ resilience on the transmission loss of the system.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3249420