Abstract
This paper aims to numerically investigate the effects of parametric instability on piezoelectric energy harvesting from the transverse galloping of a square prism. A two degrees-of-freedom reduced-order model for this problem is proposed and numerically integrated. A usual quasi-steady galloping model is applied, where the transverse force coefficient is adopted as a cubic polynomial function with respect to the angle of attack. Time-histories of nondimensional prism displacement, electric voltage and power dissipated at both the dashpot and the electrical resistance are obtained as functions of the reduced velocity. Both, oscillation amplitude and electric voltage, increased with the reduced velocity for all parametric excitation conditions tested. For low values of reduced velocity, 2:1 parametric excitation enhances the electric voltage. On the other hand, for higher reduced velocities, a 1:1 parametric excitation (i.e., the same as the natural frequency) enhances both oscillation amplitude and electric voltage. It has been also found that, depending on the parametric excitation frequency, the harvested electrical power can be amplified in 70% when compared to the case under no parametric excitation.
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Acknowledgements
The first and the thrid authors acknowledge National Research Council – CNPq for grants 310595/2015-0 and 08990/2014-5. The second author acknowledges undergraduate scholarship provided by University of São Paulo research nucleous NAP-OS (Nucleous for Research Support – Sustainable Ocean).
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Foundation item: Supported by National Research Council – CNPq for Grants 310595/2015-0 and 08990/2014-5
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Franzini, G.R., Santos, R.C.S. & Pesce, C.P. A numerical study on piezoelectric energy harvesting by combining transverse galloping and parametric instability phenomena. J. Marine. Sci. Appl. 16, 465–472 (2017). https://doi.org/10.1007/s11804-017-1439-1
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DOI: https://doi.org/10.1007/s11804-017-1439-1