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15 April 2016 Periodic substructure for multi-frequency energy harvesting with single piezoelectric patch
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Simple piezo benders are able to harvest energy almost only at their first natural frequency. Thus, their efficiency is good only in presence of harmonic excitation having frequency equal to their first natural frequency. In case of wide band excitation, instead, more complex solutions have to be sought for. In particular, various forms of nonlinearity have been investigated that allow to “bend” resonance peaks and thus convert kinetic energy into electric energy over a wider frequency band. Also harvester with more benders have been analyzed.

In the present paper a novel periodic substructure is proposed that allows to obtain several eigen-frequencies in a given frequency range. Moreover, the position where the piezo bender is placed has the same mode of vibration for all these eigen-frequencies. The bender is therefore able to harvest energy at all these eigen-frequencies thus greatly improving the overall efficiency. The next step will be to introduce nonlinearities in the substructure to even further extend the range of frequencies at which energy is harvested.
Conference Presentation
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
F. Braghin, I. Mehdipour, N. Lecis, and C. Galassi "Periodic substructure for multi-frequency energy harvesting with single piezoelectric patch", Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97990O (15 April 2016);

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