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.
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F. Braghin, I. Mehdipour, N. Lecis, 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);