Nowadays, with increasing progress in technology and the growth of the human population, the need for energy is increasing, consequently, researchers pay more attention to renewable energies. One of these sources of energy is ocean wave energy, which has the highest energy density among other renewable energies. However, because of the low frequency of ocean waves, this source of energy gets fewer considerations in the case of vibration-based energy harvesting. In this study, heave motions of an unmoored moving floater are considered for vibration-based energy harvesting. To do so, a two-degree-of-freedom piezoelectric system is considered, and its governing equations are derived. Then, the geometry of the floater, which is used for harvesting energy from the ocean waves is studied. Finally, the effects of changing the geometry of the floater on the amount of harvested energy are studied.

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