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RODRIGUES, G. K. Performance evaluation for piezo disks application with metamaterials for vibration control. 2019. 88p. Dissertação (Mestrado) Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2019. Acoustic and sctructural metamaterials have recently emerged as a means for exploring phenomena previously related to electromagnetic wave propagation, such fotonic crystals, in systems subject to mechanical waves, structural and/or acoustic. Among these phenomena, are the Bragg scattering found in periodic structures and local resonances, which promote energy attenuation on the system in certain frequency bands, the so called band gaps. This new paradigm in materials, as described and demonstrated in the literature, offers competitive solutions from the point of view of performance and mass loading, offering an interesting alternative for the control of noise and vibrations with potential of applications in diverse engineering areas. Therefore, this thesis aims at the numerical and experimental study of structures installed with periodic elements, suitable for the attenuation of vibrations. Furthermore, piezoelectric materials were explored in the constitution of the unit cells, that make up the periodic structure, seeking for performace improvement by targerting the side peaks originated by the creation of the band gap, via shunt circuitry based on synthetic inductances. In order to do so, this thesis presents design, simulation and validation of unit cells, aiming to adjust its dynamic properties and, then, installing periodic patterns of these cells in a host structure, achieving the band gap with a resonable attenuation of the side peaks.

Avaliação do desempenho de discos piezelétricos aplicados a metamateriais para controle de vibração