Computational vibroacoustics in low- and medium- frequency bands: damping, ROM, and UQ modeling

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

Within the framework of the state-of-the-art, this paper presents a summary of some common research works carried out by the authors concerning computational methods for the prediction of the responses in the frequency domain of general linear dissipative vibroacoustics (structural-acoustic) systems for liquid and gas in the low-frequency (LF) and medium-frequency (MF) domains, including uncertainty quantification (UQ) that plays an important role in the MF domain. The system under consideration consists of a deformable dissipative structure, coupled with an internal dissipative acoustic fluid including a wall acoustic impedance, and surrounded by an infinite acoustic fluid. The system is submitted to given internal and external acoustic sources and to prescribed mechanical forces. An efficient reduced-order computational model (ROM) is constructed using a finite element discretization (FEM) for the structure and the internal acoustic fluid. The external acoustic fluid is treated using a symmetric boundary element method (BEM) in the frequency domain. All the required modeling aspects required for the analysis in the MF domain have been introduced, in particular the frequency-dependent damping phenomena and model uncertainties. An industrial application to a complex computational vibroacoustic model of an automobile is presented.

Mots clés: reduced-order model; medium frequency; low frequency; uncertainty quantification; boundary element method; wall acoustic impedance; structural acoustics; vibroacoustic; dissipative system; finite element discretization

Domaines: Sciences de l'ingénieur [physics]; Probabilités [math.PR]; Statistiques [math.ST]; Acoustique [physics.class-ph]; Mécanique [physics.med-ph]

Roger Ohayon, Christian Soize. Computational vibroacoustics in low- and medium- frequency bands: damping, ROM, and UQ modeling. Applied Sciences, 2017, 7 (6), ⟨10.3390/app7060586⟩. ⟨hal-01534576⟩