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

Abstract : 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 is constituted 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.
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Submitted on : Monday, June 11, 2018 - 2:37:16 PM
Last modification on : Thursday, July 18, 2019 - 4:36:07 PM

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Roger Ohayon, Christian Soize. Computational ibroacoustics in low- and medium- frequency bands: damping, ROM, and UQ modeling. R. Citarella and L. Federico. Advances in Vibroacoustics and Aeroacoustics of Aerospace and Automotive Systems, MDPI, pp.134-172, 2018, 978-3-03842-852-7. ⟨10.3390/books978-3-03842-852-7⟩. ⟨hal-01812475⟩

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