Abstract
In the present work a piezoelectric energy converter array from mechanical vibrations that combines the multi-frequency and nonlinear approaches is presented. Multiple piezoelectric cantilevers on ferromagnetic substrate with different frequency responses are combined in order to increase the overall equivalent bandwidth, while a permanent magnet introduces external nonlinear forces that create a bistable system capable to increase the tip velocity of cantilevers and the power converted, and shift the converter array bandwidth towards lower frequencies. The experimental results confirm that combining cantilevers with different potential curves can be useful to obtain a collective bistable behaviour, therefore increasing the overall effectiveness of the converter array.
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Acknowledgments
The work was partially carried out under the project PRIN2009-2009KFLWJA co-funded by the Italian MIUR.
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Alghisi, D., BaĆ¹, M., Ferrari, M., Ferrari, V. (2014). Multi-frequency Nonlinear Converter Array for Energy Harvesting in Autonomous Sensors. In: Baldini, F., et al. Sensors. Lecture Notes in Electrical Engineering, vol 162. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3860-1_42
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DOI: https://doi.org/10.1007/978-1-4614-3860-1_42
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