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International audience; An energy density field approach for the vibroacoustic analysis of complex structures is proposed. This method is developed for an uncertain vibroacoustic computational model. An important result of using this method is the construction of an automatic sub-structuring method for complex structures which is applicable at low- and medium-frequency ranges. Though the proposed energy method is inspired from the Statistical Energy Analysis (SEA) method, it is quite different. Mainly, in the stochastic context in which the method is applied the statistical properties of the FRF were observed even in the low- and medium-frequency ranges which makes the method applicable in these frequency ranges.

International audience; A new energy-density field approach is proposed for low- and medium-frequency vibroacoustic analysis of complex industrial structures, using a probabilistic computational model. The observed structure is composed of a trimmed body coupled and its internal cavity. The objective of this paper is to take advantage of some statistical properties of the frequency response functions to build a simplified vibroacoustic model. In this approach, the Frequency Response Functions (FRF) of the vibroacoustic system are expressed as the product of a dimensionless "smooth" matrix and local mobilities or impedances, depending on their type (acoustical, vibratory or vibroacoustic). The stochastic computational model of the vibroacoustic system is obtained from the reduced mean computational model and is using a nonparametric probabilistic approach.