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Proceedings Paper

Periodic substructure for multi-frequency energy harvesting with single piezoelectric patch
Author(s): F. Braghin; I. Mehdipour; N. Lecis; C. Galassi
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Paper Abstract

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.

Paper Details

Date Published: 15 April 2016
PDF: 9 pages
Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97990O (15 April 2016); doi: 10.1117/12.2219547
Show Author Affiliations
F. Braghin, Politecnico di Milano (Italy)
I. Mehdipour, Politecnico di Milano (Italy)
N. Lecis, Politecnico di Milano (Italy)
C. Galassi, Institute of Science and Technology of Ceramics, CNR (Italy)


Published in SPIE Proceedings Vol. 9799:
Active and Passive Smart Structures and Integrated Systems 2016
Gyuhae Park, Editor(s)

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