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Non-linear losses study in strongly coupled piezoelectric device for broadband energy harvesting

Abstract : Piezoelectric vibration harvesters with strong electromechanical coupling coefficients have recently been combined with nonlinear electrical techniques capable of tuning their resonant frequency as a solution to provide energy to wireless sensor nodes from wideband vibrations. To be fully competitive, this approach requires piezoelectric generators with strong global electromechanical coupling coefficients k². However, the presence of non-linear dielectric and piezoelectric losses in piezoelectric materials significantly reduces the power harvested when strongly coupled materials are used. This paper presents a non-linear model that allows for a better consideration of losses for such piezoelectric harvesters. An experimental validation is performed with a strongly coupled cantilever based on a PMN-PT material (k²=16 %). The results reveal the importance of considering non-linear dielectric losses. Indeed, we show thanks to the model that neglecting these losses can induce an 18 % overestimation of the harvested power for the presented prototype driven at 0.5 m/s 2 amplitude ambient acceleration.
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https://hal.archives-ouvertes.fr/hal-03335253
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Soumis le : lundi 6 septembre 2021 - 09:58:50
Dernière modification le : lundi 17 octobre 2022 - 11:45:08
Archivage à long terme le : : mardi 7 décembre 2021 - 18:19:10

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David Gibus, Pierre Gasnier, Adrien Morel, Nicolas Garraud, Adrien Badel. Non-linear losses study in strongly coupled piezoelectric device for broadband energy harvesting. Mechanical Systems and Signal Processing, 2022, 165, pp.108370. ⟨10.1016/j.ymssp.2021.108370⟩. ⟨hal-03335253⟩

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