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Porous absorber modeling for low-mid frequency finite element method
Publikationstyp
Journal Article
Date Issued
2015-07-01
Sprache
English
Author(s)
Institut
TORE-URI
Volume
101
Issue
4
Start Page
829
End Page
841
Citation
Acta Acustica united with Acustica 4 (101): 829-841 (2015)
Publisher DOI
Scopus ID
Publisher
Hirzel
In this paper a new way of modeling acoustical absorber-type trims is presented. The aim of this modeling is to provide a simplified description of an acoustical trim, such as multilayered porous materials. It is assumed that one of the multilayer faces is placed on a vibrating structure. The other face is coupled with a receiver cavity. This corresponds to typical real-life configurations. The proposed approach consists mainly of two stateof- The-art methods for the description of the acoustical and structural damping phenomena that occur due to the trim: One of these methods is modified and adapted for this purpose. Measured data have been used in order to validate the new approach whereas a reference poroelastic Finite Element Method (FEM) has been employed for the numerical verification. Since precalculated data replace the trim in a target vibroacoustic FE model, the computation times needed to obtain the responses can be kept at a level that is comparable with a configuration without trim. The presented results are showing a very good agreement with the measurements as well as with the computed references.
DDC Class
600: Technik