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A piezoelectric based energy harvester with dynamic magnification: modelling, design and experimental assessment

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Abstract

This work presents a simple and innovative piezoelectric energy harvester, inspired by fractal geometry and intrinsically including dynamic magnification. Energy harvesting from ambient vibrations exploiting piezoelectric materials is an efficient solution for the development of self-sustainable electronic nodes. After an initial design step, the present work investigates the eigenfrequencies of the proposed harvester, both through a simple free vibration analysis model and through a computational modal analysis. The experimental validation performed on a prototype, confirms the accurate frequency response predicted by these models with five eigenfrequencies below 100 Hz. Despite the harvester has piezoelectric transducers only on a symmetric half of the top surface of the lamina, the rate of energy conversion is significant for all the investigated eigenfrequencies. Moreover, by adding a small ballast mass on the structure, it is possible to excite specific eigenfrequencies and thus improving the energy conversion.

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Authors and Affiliations

  1. Department of Sciences and Methods for Engineering, University of Modena and Reggio Emilia, 42122, Reggio Emilia, RE, Italy

    Davide Castagnetti & Enrico Radi

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  1. Davide Castagnetti
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  2. Enrico Radi
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Correspondence to Davide Castagnetti.

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Castagnetti, D., Radi, E. A piezoelectric based energy harvester with dynamic magnification: modelling, design and experimental assessment. Meccanica 53, 2725–2742 (2018). https://doi.org/10.1007/s11012-018-0860-0

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  • DOI: https://doi.org/10.1007/s11012-018-0860-0

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