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Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

Chronopoulos, Dimitrios; Ichchou, M.; Troclet, B.; Bareille, O.

Authors

Dimitrios Chronopoulos

M. Ichchou

B. Troclet

O. Bareille



Abstract

A robust procedure for the prediction of the dynamic response of layered panels within a SEA wave-context approach is proposed hereby. The dispersion characteristics of two dimensional composite orthotropic structures are predicted using a Wave Finite Element method. By manipulating the mass and stiffness matrices of the modelled structural segment a polynomial eigenvalue problem is formed, the solutions of which correspond to the propagation constants of the waves travelling within the structure. The wavenumbers and group velocities for waves comprising out of plane structural displacements can then be calculated. Using the numerically extracted wave propagation data the most important SEA quantities of the structure, namely the modal density and the radiation efficiency of each wave type are calculated. The vibroacoustic response of the structure under a broadband diffused excitation is then computed within a SEA approach. The impact of the symmetric and the antisymmetric vibrational motion of the panel on its sound transmission loss is exhibited and the approach proves robust enough for thin as well as for thick layered structures.

Journal Article Type Article
Publication Date Mar 7, 2014
Journal Applied Acoustics
Print ISSN 0003-682X
Electronic ISSN 0003-682X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 77
APA6 Citation Chronopoulos, D., Ichchou, M., Troclet, B., & Bareille, O. (2014). Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach. Applied Acoustics, 77, doi:10.1016/j.apacoust.2013.10.002
DOI https://doi.org/10.1016/j.apacoust.2013.10.002
Keywords Aerospace composites, Wave propagation, Sound Transmission Loss
Publisher URL http://www.sciencedirect.com/science/article/pii/S0003682X13002375
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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