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Performance of a restrained-interface substructuring FE model for reduction of structural-acoustic problems with poroelastic damping
Conservatoire National des Arts et Métiers (Cnam).ORCID iD: 0000-0002-6555-531X
2011 (English)In: Computers & structures, ISSN 0045-7949, E-ISSN 1879-2243, Vol. 89, no 23-24, 2233-2248 p.Article in journal (Refereed) Published
Abstract [en]

This work deals with numerical computation of structural-acoustic applications including dissipative interfaces, in the context of structure-borne noise reduction. It focuses on the need to propose efficient solution strategies for costly finite element modelling. As such, a restrained-interface component mode synthesis is applied to the conservative parts of structural-acoustic applications. The method description being general and computational-oriented, it is straightforwardly applicable to a wide range of problems. The aim is to establish the efficiency as well as the limitations in the use of such a reduced model for harmonic solutions to dissipative structural-acoustic applications including 3D modelling of porous media.

Place, publisher, year, edition, pages
2011. Vol. 89, no 23-24, 2233-2248 p.
Keyword [en]
Structural-acoustics, Dissipative interface, Noise reduction, Reduced model, Component mode synthesis, Poroelastic materials
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-90444DOI: 10.1016/j.compstruc.2011.08.012ISI: 000297907500011OAI: oai:DiVA.org:kth-90444DiVA: diva2:505500
Note

QC 20120224

Available from: 2012-02-24 Created: 2012-02-24 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Efficient Finite Element Approach for Structural-Acoustic Applications including 3D modelling of Sound Absorbing Porous Materials
Open this publication in new window or tab >>Efficient Finite Element Approach for Structural-Acoustic Applications including 3D modelling of Sound Absorbing Porous Materials
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the context of interior noise reduction, the present work aims at proposing Finite Element (FE) solution strategies for interior structural-acoustic applications including 3D modelling of homogeneous and isotropic poroelastic materials, under timeharmonic excitations, and in the low frequency range. A model based on the Biot-Allard theory is used for the poroelastic materials, which is known to be very costly in terms of computational resources. Reduced models offer the possibility to enhance the resolution of such complex problems. However, their applicability to porous materials remained to be demonstrated.First, this thesis presents FE resolutions of poro-elasto-acoustic coupled problems using modal-based approaches both for the acoustic and porous domains. The original modal approach proposed for porous media, together with a dedicated mode selection and truncation procedure, are validated on 1D to 3D applications.In a second part, modal-reduced models are combined with a Padé approximants reconstruction scheme in order to further improve the efficiency.A concluding chapter presents a comparison and a combination of the proposed methods on a 3D academic application, showing promising performances. Conclusions are then drawn to provide indications for future research and tests to be conducted in order to further enhance the methodologies proposed in this thesis.

Abstract [fr]

Dans le contexte de lutte contre les nuisances sonores, cette thèse porte sur le développement de méthodes de résolution efficaces par éléments finis, pour des problèmes de vibroacoustique interne avec interfaces dissipatives, dans le domaine des basses fréquences. L’étude se limite à l’utilisation de solutions passives telles que l’intégration de matériaux poreux homogènes et isotropes, modélisés par une approche fondée sur la théorie de Biot-Allard. Ces modèles étant coûteux en terme de résolution, un des objectifs de cette thèse est de proposer une approche modale pour la réduction du problème poroélastique, bien que l’adéquation d’une telle approche avec le comportement dynamique des matériaux poreux soit à démontrer.Dans un premier temps, la résolution de problèmes couplés élasto-poro-acoustiques par sous-structuration dynamique des domaines acoustiques et poreux est établie. L’approche modale originale proposée pour les milieux poroélastiques, ainsi qu’une procédure de sélection des modes significatifs, sont validées sur des exemples 1D à 3D.Une deuxième partie présente une méthode combinant l’utilisation des modèles réduits précédemment établis avec une procédure d’approximation de solution par approximants de Padé. Il est montré qu’une telle combinaison offre la possibilité d’accroître les performances de la résolution (allocation mémoire et ressources en temps de calcul).Un chapitre dédié aux applications permet d’évaluer et comparer les approches sur un problème académique 3D, mettant en valeur leurs performances encourageantes. Afin d’améliorer les méthodes établies dans cette thèse, des perspectives à ces travaux de recherche sont apportées en conclusion.

Place, publisher, year, edition, pages
Stockholm: Royal Institute of Technology, 2012. xvi, 189 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:10
Keyword
Noise reduction, Poroelastic materials, Reduced model, Component mode synthesis, Padé approximants, Structural-acoustics, Finite element method, Fluid-structure interaction., Matériaux poroélastiques, Modèles réduits, Sous-structuration dynamique, Approximants de Padé, Vibroacoustique interne, Eléments finis, Interaction fluid-structure.
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Ljud och vibrationer
Identifiers
urn:nbn:se:kth:diva-90335 (URN)978-91-7501-279-7 (ISBN)
Public defence
2012-03-13, Amphi, Cnam, 2 rue Conté, Paris, France, 14:00 (English)
Opponent
Supervisors
Projects
FP6 Marie-Curie Smart StructuresFP7 Marie-Curie Mid-Frequency
Funder
EU, FP7, Seventh Framework Programme, 214909EU, European Research Council, 35559TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120224

Available from: 2012-02-24 Created: 2012-02-22 Last updated: 2013-04-11Bibliographically approved

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Rumpler, Romain

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