Metamaterial-inspired electroelastoacoustic energy harvesting
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This thesis covers three objectives for achieving Metamaterial-Inspired Electroelastoacoustic Energy Harvesting. Each objective is detailed aimed at significantly advancing the current understanding of mechanical wave energy harvesting. First objective is “Nonlinear Energy Sinks” concerns a clearance-type nonlinear energy sink to harvest electrical power from non-stationary mechanical waves. Analytical, computational, and experimental methods are employed to explore and verify the sink performance. The second objective studies “Energy Harvesting in Piezoelectric Plate-Harvester Systems”. An analytical framework for predicting the wave energy harvested by a circular piezoelectric disk attached to a thin plate is presented for the next topic. A harmonic point source excitation generates waves incident on a piezoelectric disk. In addition, the voltage generated by the harvester is calculated using coupled electromechanical equations. The analysis is validated by comparing predicted response quantities to those computed using numerical simulations and measured through an experimental setup. The last topic develops and experimentally validates a “T-Matrix for a Circular Piezoelectric” to be used in multiple scattering approach for computing the wave response of plate-harvester systems incorporating multiple scatterers. The overall goal is to enhance the wave power generated by a circular piezoelectric disk via the addition of targeted cylindrical inclusions. Relationship between incident and reflected waves from inclusions in a host layer, and is introduced herein for a piezoelectric patch connected to an external circuit.