A coupled FE-BE analysis of acoustic cavities confined inside laminated composite enclosures

The structural acoustic problem, wherein an acoustic domain is confined within a partly flexible laminated composite enclosure is presented. From the finite element free vibration analysis of the laminated folded plate structure a mobility relation is derived between the normal velocity of the struc...

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Bibliographic Details
Published in:Aircraft Engineering 2000-01, Vol.72 (4), p.345-357
Main Authors: Guha Niyogi, Arup, Laha, M.K., Sinha, P.K.
Format: Article
Language:English
Subjects:
Acoustics
Aerospace engineering
Aerospace industry
Case studies
Composite materials
Construction
Design engineering
Shear stress
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Summary:The structural acoustic problem, wherein an acoustic domain is confined within a partly flexible laminated composite enclosure is presented. From the finite element free vibration analysis of the laminated folded plate structure a mobility relation is derived between the normal velocity of the structure and normal pressure on the structure. A boundary element solver for the Helmholtz equation with quadratic isoparametric elements is developed using pressure-velocity formulation. Velocity is known over certain parts of the boundary, the rest being the interactive boundary, where the mobility relation correlates nodal pressures and velocities, neither explicitly known. The pressure boundary values are solved from the boundary element and the mobility relations, while the nodal particle velocities and domain pressures are computed at desired points thereafter. New results presented here reveal the effects of the variation in magnitude of structural damping, fiber angles and the thickness of walls.
ISSN:1748-8842
0002-2667
1758-4213
DOI:10.1108/00022660010340150