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Modélisation numérique des résonances par une formulation intégrale - Application au confort acoustique dans une cavité 3D

Abstract : Since vehicle noise problems are now a serious concern in the automotive industry, there is a strong demand to implement a method which can predict the noise level in the early design stage of a vehicle, and particularly, the noise caused by structural vibration. This increasing demand for acoustic eigenvalues analysis calls for an efficient and reliable method of computation of resonance frequencies of acoustical cavities. Classically, the calculation of these frequencies is carried out using the finite element method. This technique requires to mesh the structure and the fluid. It can be expensive in CPU time for large structures. We propose in this thesis an integral formulation based on the particular integral method. It is modified to avoid inversion of matrix and to solve a problem with mixed boundary conditions. After validation by comparison with analytical solutions, it is applied to a compartment of Sedan type with various surface conditions (rigid and elastic). The principal developments deals with: additional internal points to improve convergence, Arnoldi's algorithm to extract eigenvalues in the case of dense and unsymmetric problem, Jacobi-Davidson's algorithm in the quadratic case, and an original way to take into account boundary absorption.
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https://tel.archives-ouvertes.fr/tel-00261712
Contributor : Alexandre Leblanc <>
Submitted on : Saturday, March 8, 2008 - 7:06:01 PM
Last modification on : Wednesday, November 29, 2017 - 9:25:39 AM
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  • HAL Id : tel-00261712, version 1

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Alexandre Leblanc. Modélisation numérique des résonances par une formulation intégrale - Application au confort acoustique dans une cavité 3D. Acoustique [physics.class-ph]. Université d'Artois, 2004. Français. ⟨tel-00261712⟩

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