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Structural Acoustics and Vibration: Mechanical Models, Variational Formulations and Discretization
- Publisher
- Emerald Publishing
- Copyright
- Copyright © 2000 MCB UP Ltd. All rights reserved.
- ISSN
- 0002-2667
- DOI
- 10.1108/00022660010340150
- Publisher site
- See Article on Publisher Site
Abstract
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.
Journal
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Aug 1, 2000
Keywords: Finite element method; Boundary element method; Composites; Acoustics