Using an energy method in an uncertain computational vibroacoustic model for an automatic sub-structuring of the structure in low- and medium-frequency ranges

M. Kassem (1, 2) , Christian Soize (2) , L. Gagliardini (1)

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

An automatic sub-structuring method applicable in the low- and medium-frequency ranges is proposed. This method is developed using a simplified model constructed using an energy method in a stochastic context. The proposed energy method, although inspired from the Statistical Energy Analysis (SEA), it differs from it and is applicable in the low- and medium-frequency ranges when using a statistical computational model. The nonparametric probabilistic approach for system parameters and model uncertainties is used to construct this statistical model. Main results of the energy method are ; dimensionless random frequency response functions (FRF) which are shown to be less dispersed than the usual dimensional ones and independent of the direction of excitation, a simplified vibroacoustic model, and finally the automatic sub-structuring method which is obtained from the simplified model using the theory of information.

Mots clés: uncertainty quantification; computational mechanics

Domaines: Mécanique [physics.med-ph]; Probabilités [math.PR]

M. Kassem, Christian Soize, L. Gagliardini. Using an energy method in an uncertain computational vibroacoustic model for an automatic sub-structuring of the structure in low- and medium-frequency ranges. Tenth U. S. National Congress on Computational Mechanics (USNCCM X 2009), Jul 2009, Columbus, Ohio, United States. pp.1-1. ⟨hal-00699003⟩