Finite element analyses of double-wall sandwich structures with viscoelastic core
Résumé
This paper presents a reduced order finite element model for soundtransmission analysis through a double-wall sandwich structures with viscoelasticcore inserted in an infinite baffle. The proposed model is derived from a multi-fieldvariational principle involving structural displacement and acoustic pressure insidethe fluid cavity. To solve the vibro-acoustic problem, the plate displacements areexpanded as a modal summation of the plate's eigenfunctions in vacuo. Similarly, thecavity pressure is expanded as a summation over the modes of the cavity with rigidboundaries. Then, an appropriate reduced-order model is introduced. The structure isexcited by a plane wave at the source side. An example of the normal soundtransmission loss of a double glazed window with laminated glass is shown. Thisexample illustrates the accuracy and the versatility of the proposed reduced ordermodel, especially in terms of prediction of sound transmission.
Domaines
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