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This and the next 2 images are from:
W. Larbi, J.F. Deue and R. Ohayon (Structural Mechanics and Coupled Systems Laboratory, Conservatoire National des Arts et Métiers, 292 rue Saint-Martin, 75141 Paris Cedex 03, France), “Vibroacoustic analysis of double-wall sandwich panels with viscoelastic core”, Computers & Structures, Vol. 174, pp 92-103, October 2016, https://doi.org/10.1016/j.compstruc.2015.09.012
ABSTRACT: In this work, an original finite element modeling to investigate the effects of a viscoelastic layer on the sound transmission through double-wall sandwich panels is presented. This formulation is obtained from a coupled fluid–structure variational principle taking into account the frequency dependence of the viscoelastic material. The resolution approach is based on a reduced order model generated by a modal projection technique. The sound insulation of the panels is evaluated by computing its sound transmission factor using Rayleigh integral method. An efficient and inexpensive finite element for a sandwich plate with viscoelastic core is developed. Various results are presented in order to validate and illustrate the efficiency of the proposed finite element formulations.
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