Energy harvesting devices are structures subjected to dynamic loads (force or vibration) that convert mechanical energy into electrical energy. From the materials capable of converting mechanical into electrical energy, piezoelectric materials are among the most promising in this area. The design of these devices are complex and may be obtained through topology optimization method (TOM), which combines optimization and finite element algorithms to design structures with complex topologies. In this work, the objective is to maximize the electric energy generated by mechanical strains at piezoelectric material areas, which are coupled to the mechanical structures. The research of energy harvesting devices operating by dynamic response comprehends the optimized design, simulation, manufacturing, and experimental characterization of these devices. The precise acquisition of piezoelectric material properties is essential to the design of energy harvesting devices, and also to a wide area where piezoelectric materials are used, such as sensors and actuators. Thus, this research also involves the characterization of real and complex variables of the elastic, piezoelectric, and dielectric properties of piezoelectric materials using an iterative optimization algorithm process, where the objective is to minimize the difference between the experimental and numerical electric impedances. Therefore, this work intend to perform the complete cycle of the optimized design of piezoelectric energy harvesting devices, including the experimental characterization to validate the methodology, together with the development of a methodology to characterize the piezoelectric properties.
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