RENZI, E., 2016. Hydro-electromechanical modelling of a piezoelectric wave energy converter. Proceedings of the Royal Society of London. Series A, Mathematical and physical sciences, 472(2195): 20160715.
We investigate the hydro-electromechanical coupled dynamics of a piezoelectric wave energy converter. The converter is made of a flexible bimorph plate, clamped at its ends and forced to motion by incident ocean surface waves. The piezoceramic layers
are connected in series and transform the elastic motion of the plate into useful electricity by means of the piezoelectric effect. By using a distributedparameter
analytical approach, we couple the linear
piezoelectric constitutive equations for the plate with the potential-flow equations for the surface water waves. The resulting system of governing partial differential equations yields a new hydroelectromechanical
dispersion relation, whose complex roots are determined with a numerical approach. The
effect of the piezoelectric coupling in the hydro-elastic domain generates a system of short- and long-crested weakly damped progressive waves travelling along the plate. We show that the short-crested flexural wave component gives a dominant contribution to the generated power. We determine the hydroelectromechanical
resonant periods of the device, at which the power output is significant.
This paper was accepted for publication in the journal Proceedings of the Royal Society of London. Series A, Mathematical and physical sciences and the definitive published version is available at http://dx.doi.org/10.1098/rspa.2016.0715.