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Appl. Sci. 2017, 7(6), 586; doi:10.3390/app7060586

Computational Vibroacoustics in Low- and Medium- Frequency Bands: Damping, ROM, and UQ Modeling

1
Structural Mechanics and Coupled Systems Laboratory, Conservatoire National des Arts et Metiers (CNAM), 2 rue Conte, 75003 Paris, France
2
Laboratoire Modélisation et Simulation Multi-Echelle (MSME UMR 8208 CNRS), Université Paris-Est, 5 bd Descartes, 77454 Marne-la-Vallée, France
*
Author to whom correspondence should be addressed.
Academic Editors: Roberto Citarella and Luigi Federico
Received: 10 May 2017 / Revised: 30 May 2017 / Accepted: 3 June 2017 / Published: 7 June 2017
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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 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. View Full-Text
Keywords: structural acoustics; vibroacoustic; uncertainty quantification; reduced-order model; medium frequency; low frequency; dissipative system; wall acoustic impedance; finite element discretization; boundary element method structural acoustics; vibroacoustic; uncertainty quantification; reduced-order model; medium frequency; low frequency; dissipative system; wall acoustic impedance; finite element discretization; boundary element method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ohayon, R.; Soize, C. Computational Vibroacoustics in Low- and Medium- Frequency Bands: Damping, ROM, and UQ Modeling. Appl. Sci. 2017, 7, 586.

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