Structural-acoustic modeling of automotive vehicles in presence of uncertainties and experimental identification and validation

J.-F. Durand (1, 2) , Christian Soize (1) , L. Gagliardini (2)

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

The design of cars is mainly based on the use of computational models to analyze structural vibrations and internal acoustic levels. Considering the very high complexity of such structural-acoustic systems, and in order to improve the robustness of such computational structural-acoustic models, both model uncertainties and data uncertainties must be taken into account. In this context, a probabilistic approach of uncertainties is implemented in an adapted computational structural-acoustic model. The two main problems are the experimental identification of the parameters controlling the uncertainty levels and the experimental validation. Relevant experiments have especially been developed for this research in order to constitute an experimental database devoted to structural vibrations and internal acoustic pressures. This database is used to perform the experimental identification of the probability model parameters and to validate the stochastic computational model. (C) 2008 Acoustical Society of America.

Mots clés: uncertainty quantification; computational vibroacoustics; nonparametric probabilistic approach; model uncertainties; modeleing errors; statistical inverse problem; experimenatal identification; random matrix; stochastic reduced-order model; stochastic dynamics; random vibration; automotive vehicle

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

J.-F. Durand, Christian Soize, L. Gagliardini. Structural-acoustic modeling of automotive vehicles in presence of uncertainties and experimental identification and validation. Journal of the Acoustical Society of America, 2008, 124 (3), pp.1513-1525. ⟨10.1121/1.2953316⟩. ⟨hal-00685108⟩