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Theses

Reproduction sonore 3D par surface émettrice de sons dans un véhicule

Abstract : The main objective of this thesis is to propose alternative solutions to classical electrodynamic loudspeakers used in the automobile industry being compliant with spatial sound rendering. The idea is to make indoor garnishments equipped with actuators (electrodynamic or piezoelectric) vibrating and radiating sound by focusing bending waves inside them. Firstly, three wave focusing methods have been formalized in a common framework and adapted to audio applications. A parametric study was conducted to compare them using dedicated key performance indexes. It turns out that the most efficient method in this context is the inversion of the spatio-temporal propagation operator which requires a prior experimental learning of the structure dynamics. An experimental validation of the focusing abilities of this method has been achieved on a car door. Learning through a numerical twin instead of time-consuming experimental data has also been validated. Then temperature variations between -10°C and 60°C existing car have been considered. The dynamic properties of the host structure (made of polypropylene in general) indeed vary widely in this temperature range. A temperature compensation strategy based on digital twins feeding neural networks has therefore been implemented. In addition, noise and vibrations due to the engine and the road can impact bending wave focusing. A closed loop strategy is therefore used to guarantee the performance of the focusing algorithm while eliminating those disturbances.
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Submitted on : Tuesday, February 8, 2022 - 11:59:20 AM
Last modification on : Wednesday, September 28, 2022 - 5:53:59 AM
Long-term archiving on: : Monday, May 9, 2022 - 6:53:41 PM

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  • HAL Id : tel-03561548, version 1

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Nassim Benbara. Reproduction sonore 3D par surface émettrice de sons dans un véhicule. Acoustique [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE025⟩. ⟨tel-03561548⟩

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