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Mesure et prédiction vibroacoustique de structures viscoélastiques - Application à une enceinte acoustique.

Abstract : Damping augmentation is a common approach to vibration control in structures (vibroacoustics, vibration fatigue). Viscoelastic materials can be used to design efficient damping treatments. The mechanical properties of these materials however depend on frequency, but also on prestress and temperature. Traditional representations for viscoelastic materials, finite element design and computation methods for damped structures are presented along with new reduction techniques such as the Residual Iteration process.
A dynamic test bench has been designed and built to measure directly the complex stiffness of viscoelastic films of standard sandwich plates using an electrodynamic shaker in the frequency range of 1-2000 Hz, for temperatures of 0-50 ?C and what is new, for static shear rates of 0-300 %. The tests reveal how the temperature-frequency superposition hypothesis can be extended to prestress.
The second objective of this work is to investigate and improve the vibroacoustic behaviour of an audio speaker. A finite/boundary element model is built and validated through measurements for the low frequency range (0-2000 Hz). An efficient damping treatment is proposed and its properties optimized.
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Submitted on : Monday, January 30, 2006 - 2:45:32 PM
Last modification on : Wednesday, July 8, 2020 - 11:10:20 AM
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Gérald Kergourlay. Mesure et prédiction vibroacoustique de structures viscoélastiques - Application à une enceinte acoustique.. Mécanique [physics.med-ph]. Ecole Centrale Paris, 2004. Français. ⟨tel-00011493⟩

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