Tech Papers

[16] Modeling the Vibro-Acoustic Effect of Trim on Full Vehicle and Component Level Analysis

In the automotive industry, the influence of poro-elastic components on acoustic comfort has been mostly investigated for airborne noise at mid- and high frequency ranges; however, due to the lack of adequate theoretical formulations, the influence of poro-elastic in numerical vibro-acoustic simulation at lower frequency range has often been ignored or simplified by the use of distributed spring/mass on the BIW structure and impedance on the acoustic medium. In the last few years, new theoretical
developments contributed to overcome this limitation by providing an efficient FEM formulation for poro-elastic material modelling. This FEM approach, implemented in VTM (Vehicle Trim Modeller) software developed by ESI Group, enables the computation of the coupled response of a fully trimmed vehicle by taking into account the BIW structure, the acoustic cavity and the poro-elastic components (carpet, dash insulator, headliner, seats…). This paper presents theoretical background and industrial
application examples using these new developments.

2009 – DAGA, Rotterdam, The Netherlands
Denis Blanchet (ESI Group, Germany)
Marc Anciant (ESI Group, France)
Lassen Mebarek (ESI Group, France)

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