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 eigenfrequencies in a given frequency range. Moreover, the position where the piezo bender is placed has the same mode of vibration for all these eigenfrequencies. The bender is therefore able to harvest energy at all these eigenfrequencies 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.

Periodic substructure for multi-frequency energy harvesting with single piezoelectric patch

BRAGHIN, FRANCESCO;MEHDIPOUR, IMAN;LECIS, NORA FRANCESCA MARIA;
2016

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 eigenfrequencies in a given frequency range. Moreover, the position where the piezo bender is placed has the same mode of vibration for all these eigenfrequencies. The bender is therefore able to harvest energy at all these eigenfrequencies 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.
Proceedings of SPIE - The International Society for Optical Engineering
9781510600409
9781510600409
Nonlinear energy harvester; Periodic substructure; Piezoelectric vibration energy harvester; S-shaped energy harvester; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Computer Science Applications1707 Computer Vision and Pattern Recognition; Electrical and Electronic Engineering; Applied Mathematics
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/997075
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