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CONTRIBUTION Á LA CONCEPTION D'UN MICRCONVERTISSEUR D'ÉNERGIE MÉCANIQUE VIBRATOIRE EN ÉNERGIE ÉLECTRIQUE

Abstract : The market expansion of the moveable electronic instruments and their consumption reduction in terms of energy, promote the idea to convert mechanical vibratory energy, existing in great quantity in our environment, into electrical energy. The goal of this research work is the design of a current microgenerator, based on the harvesting of mechanical vibratory energy. In order to obtain a high efficiency of the microsystem, the energy losses need to be minimized. In this approach, a study of the airflow effect on the dynamic behaviour of clamped cantilever beams made of quartz, silicon and lithium niobate is carried out via two experimental methods in dynamics (random excitation and release dynamic test) at various pressure levels surrounding the vibrating structure between the primary vacuum and the atmospheric pressure. It turns out that the energy dissipated by the effect of surrounding air is secondary compared to the energy dissipated by the microsliding phenomenon. The latter is modelled by finite element analysis using a regularized Coulomb law to simulate friction effects. Thought, the dynamic study on assembled structures (a lithium niobate plate and a silicon beam) by adhesive material (SU8 epoxy resin of 5 µm and 1 µm and compressed gold) is performed between the secondary vacuum and the atmospheric pressure with dynamic release method. All the performed experiments and modelling made possible to choose a preferred architecture of the microconverter and to determine the most favourable assembly for the energy harvesting application. The capability of shock excitation regime to transfer mechanical energy from low to high frequency vibrating modes is investigated both theoretically and experimentally. Finally, a theoretical model is developed in order to describe the microconverter system in order to estimate the power generated under given mechanical excitation pressure, amplitude and frequency.
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https://tel.archives-ouvertes.fr/tel-00284421
Contributor : Hichem Nouira <>
Submitted on : Tuesday, June 3, 2008 - 9:23:58 AM
Last modification on : Thursday, November 12, 2020 - 9:42:07 AM
Long-term archiving on: : Friday, May 28, 2010 - 9:00:09 PM

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  • HAL Id : tel-00284421, version 1

Citation

Hichem Nouira. CONTRIBUTION Á LA CONCEPTION D'UN MICRCONVERTISSEUR D'ÉNERGIE MÉCANIQUE VIBRATOIRE EN ÉNERGIE ÉLECTRIQUE. Sciences de l'ingénieur [physics]. Université de Franche-Comté, 2006. Français. ⟨tel-00284421⟩

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