Advanced computational dissipative structural acoustics and fluid-structure interaction in low- and medium-frequency domains. Reduced-order models and uncertainty quantification

Roger Ohayon (1) , Christian Soize (2)

1 LMSSC - Laboratoire de Mécanique des Structures et des Systèmes Couplés
2 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

This paper presents an advanced computational method for the prediction of the responses in the frequency domain of general linear dissipative structural-acoustic and fluid-structure systems, in the low-and medium-frequency do¬mains, including uncertainty quantification. The system under consideration is constituted of a deformable dissipative structure, coupled with an internal dissipative acoustic fluid including wall acoustic impedances and surrounded by an infinite acoustic fluid. An efficient reduced-order computational model is constructed using a finite element discretization for the structure and the internal acoustic fluid. The external acoustic fluid is treated using an appropriate boundary element method in the frequency domain. All the required modeling aspects for the analysis of the medium-frequency domain have been introduced namely, a viscoelastic behavior for the structure, an appropriate dissipative model for the internal acoustic fluid including wall acoustic impedance and a model of uncertainty in particular for modeling errors. This advanced computational formulation, corresponding to new extensions and complements with respect to the state-of-the-art, is well adapted for developing new generation of software, in particular for parallel computers.

Mots clés: Computational mechanics; Structural acoustics; Vibroacoustic; Fluid-structure interaction; Uncertainty quantification; Reduced-order model; Medium frequency; Low frequency; Dissipative system; Viscoelasticity; Wall acoustic impedance; Finite element discretization; Boundary element method

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

Roger Ohayon, Christian Soize. Advanced computational dissipative structural acoustics and fluid-structure interaction in low- and medium-frequency domains. Reduced-order models and uncertainty quantification. International Journal of Aeronautical and Space Sciences, 2012, 13 (2), pp.127-153. ⟨10.5139/IJASS.2012.13.2.127⟩. ⟨hal-00713892⟩