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Optimisation vibroacoustique de structures amorties par des traitements en élastomère

Abstract : This work is devoted to the modelling of damped structures and to the optimization of elastomer treatments for noise reduction purposes. The damping of a suspended aluminium plate partially covered by a constrained elastomer treatment has been identified in a first step through a contact-free modal analysis. A precise and systematic quantification of the main dissipation sources has then been carried out; while the thermoelastic dissipation in the aluminium, the dissipation due to air viscosity and to the acoustic radiation have been modelled, the viscoelastic dissipations within the aluminium and the elastomer have been identified. The thermoelastic computation, based on a perturbation approach to solve the coupled problem, highlights the limits of Zener's model, considered as a reference. The modelling of the elastomer relies on an identification experiment of its complex frequency-dependent stiffness modulus. A resolution platform based on the computation of the resonance modes with a finite element program, a complex eigenvalue solver as well as iterative and perturbation routines has been developped in order to account for any specific type of damping. The final algorithm can compute the instationary time/frequency response of systems with a general unproportional linear damping very rapidly and precisely. In a last part, parametric optimization studies give a fine understanding of the influence of elastomer damping treatments as well as a practical know-how in the area of noise reduction.
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https://tel.archives-ouvertes.fr/tel-00164596
Contributor : Lionel Zoghaib <>
Submitted on : Saturday, July 21, 2007 - 10:35:53 AM
Last modification on : Thursday, January 23, 2020 - 6:22:03 PM
Long-term archiving on: : Thursday, April 8, 2010 - 8:44:21 PM

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  • HAL Id : tel-00164596, version 1

Citation

Lionel Zoghaib. Optimisation vibroacoustique de structures amorties par des traitements en élastomère. Acoustique [physics.class-ph]. Université de la Méditerranée - Aix-Marseille II, 2006. Français. ⟨tel-00164596⟩

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