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Theses

Systèmes de récupération d'énergie vibratoire large bande

Abstract : The work of this thesis is focused on the mechanical energy harvesting. This technology is generally based on the use of resonant transducers. Such systems work efficiently when their resonant frequency is equal to the vibration one. Otherwise, the output power from the harvester drops dramatically. Hence, it's necessary to ensure a continuous control of the resonant frequency of the harvester in order to avoid a possible shift between the resonant frequency and the vibration one, and doing this over the frequency spectrum covered by the vibration source. The main goal of this thesis is to develop new efficient solutions able to control in real time and tune the resonant frequency, these solutions should be low power consumption. During this thesis, three solutions have been developed: 1) adjustement of the resonant frequency by applying an electric field on the piezoelectric material; 2) adjustement of the resonant by adapting the electrical load; 3) the amplification of the structure relative displacement using a rebound technique. Modelling and optimization of both the frequency adjustment techniques and the mechanical-to-electrical conversion were performed. Three structures have been developed, tested and used to validate the three approaches. Finally, a very low power consumption electronic has been developed for a real time control of the resonant frequency, by regarding the vibration frequency, and also to optimize the extracted electrical energy from the harvester by maintaining an optimum quality factor.
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Submitted on : Friday, October 11, 2013 - 11:48:31 AM
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  • HAL Id : tel-00778437, version 2

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Bouhadjar Ahmed-Seddik. Systèmes de récupération d'énergie vibratoire large bande. Autre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENT057⟩. ⟨tel-00778437v2⟩

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