A reduced formulation for the free-wave propagation analysis in composite structures

This paper presents an improved numerical strategy for the broadband analysis of wave propagation in composite or complex cross-sectional waveguides using the wave finite element method (WFE). Numerical analysis of such structures require highly discretized finite element models and leads to extensi...

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Bibliographic Details
Published in:Composite structures 2014-07, Vol.113, p.134-144
Main Authors: Droz, C., Lainé, J.-P., Ichchou, M.N., Inquiété, G.
Format: Article
Language:English
Subjects:
Acoustics
Broadband
Composite structures
Composite waveguides
Cross sections
Dispersion curves
Engineering Sciences
Finite element method
Mathematical analysis
Mathematical models
Reduction
Wave finite elements
Wave propagation
Waveguides
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Summary:This paper presents an improved numerical strategy for the broadband analysis of wave propagation in composite or complex cross-sectional waveguides using the wave finite element method (WFE). Numerical analysis of such structures require highly discretized finite element models and leads to extensive computations. The proposed formulation relies on a projection of the cross-sectional transfer matrices on a reduced set of shape functions associated to propagating waves. Dispersion curves are then predicted only using a reduced number of eigenvectors. The performances and stability of this method are evaluated using the wavenumbers and wave shapes. Validations are provided for a sandwich composite beam and a cylindrical elasto-acoustic waveguide.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2014.03.017