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Theses

Prise en compte des incertitudes des problèmes en vibro-acoustiques (ou interaction fluide-structure)

Abstract : This PhD thesis deals with the robust analysis and reliability optimization of vibro-acoustic problems (or fluid-structure interaction) taking into account the uncertainties of the input parameters. In the design and dimensioning phase, it seems interesting to model the vibro-acoustic systems and their variability, which can be mainly related to the imperfection of the geometry as well as the characteristics of the materials. It is therefore important, if not essential, to take into account the dispersion of the laws of these uncertain parameters in order to ensure a robust design. Therefore, the purpose is to determine the capabilities and limitations, in terms of precision and computational costs, of methods based on polynomial chaos developments in comparison with the Monte Carlo referential technique for studying the mechanical behavior of vibro-acoustic problems with uncertain parameters. The study of the propagation of these uncertainties allows their integration into the design phase. The goal of the reliability-Based Design Optimization (RBDO) is to find a compromise between minimum cost and a target reliability. As a result, several methods, such as the hybrid method (HM) and the Optimum Safety Factor (OSF) method, have been developed to achieve this goal. To overcome the complexity of vibro-acoustic systems with uncertain parameters, we have developed methodologies specific to this problem, via meta-modeling methods, which allowed us to build a vibro-acoustic surrogate model, which at the same time satisfies the efficiency and accuracy of the model. The objective of this thesis is to determine the best methodology to follow for the reliability optimization of vibro-acoustic systems with uncertain parameters.
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https://tel.archives-ouvertes.fr/tel-02064258
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Submitted on : Monday, March 11, 2019 - 5:24:07 PM
Last modification on : Tuesday, June 23, 2020 - 12:30:05 PM
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  • HAL Id : tel-02064258, version 1

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Khalil Dammak. Prise en compte des incertitudes des problèmes en vibro-acoustiques (ou interaction fluide-structure). Génie mécanique [physics.class-ph]. Normandie Université; École nationale d'ingénieurs de Sfax (Tunisie), 2018. Français. ⟨NNT : 2018NORMIR19⟩. ⟨tel-02064258⟩

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