Sound-insulation layers low-frequency modeling, using the fuzzy structure theory

L. Gagliardini (1) , C. Fernandez (1, 2) , Christian Soize (2)

1 PSA Peugeot Citroen
2 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

Over the past few years, car manufacturers have improved their numerical models for the prediction of the trimmed body vibroacoustic response. In the lowfrequency band [20,200] Hz, sound-insulation layer modeling remains a critical topic. Recent work allows the connection of the structure and cavity through a transfer matrix computed from a FE model of the soundinsulation layer. Nevertheless, such an approach requires a FE model of sound-insulation layer, which may not be available in early design stages. Moreover, considering the uncertainty of the design itself, in addition to material uncertainty, a deterministic model may not be appropriate. In this paper, a simplified model of sound-insulation layers based on the fuzzy structure theory is proposed. The way how the fuzzy model's parameters are related to design parameters will then be discussed. Finally, the application to a full trimmed body is presented.

Mots clés: sound-insulation layer; fuzzy structure theory; structural dynamics; uncertainty quantification

Domaines: Mécanique [physics.med-ph]; Probabilités [math.PR]; Statistiques [math.ST]; Acoustique [physics.class-ph]; Vibrations [physics.class-ph]

L. Gagliardini, C. Fernandez, Christian Soize. Sound-insulation layers low-frequency modeling, using the fuzzy structure theory. SAE 2009 world congress, Apr 2009, Detroit, Michigan, United States. Paper 09NVC-0163, Pages 1-7. ⟨hal-00692817⟩