An investigation of optimal non-uniform locally resonant piezoelectric metamaterials

Autor(es)

Thomes, Renan L. ; Mosquera-Sanchez, Jaime A. ; De Marqui Jr, Carlos ; Han, JH ; Wang, G ; Shahab, S

• Tipo de documento: Artigo Científico
• Fonte: ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS XIV; v. 11376, p. 9-pg., 2020-01-01.

Resumo

Locally resonant metamaterials display frequency attenuation regions that are not dependent on the lattice size and have been object of several studies since the 2000s. Most recently, flexible structures with periodically distributed piezoelectric attachments combined to resonant circuits have been studied as locally resonant piezoelectric metamaterials. In this work the authors use a genetic algorithm to optimize each unit cell of a piezoelectric metamaterial in order to obtain wider attenuation bands. An assumed-modes solution for a piezoelectric bimorph beam with segmented electrodes under transverse vibrations is presented. Although the unit cells of the optimized configurations have the same length (periodically distributed along the length), the target frequency of each cell varies, leading to optimal non-uniform configurations that exhibit wider attenuation bands than the uniform ones. The optimization of the proposed objective function converges to a non-uniform configuration that displays an attenuation band 56% wider than the reference case. (AU)

• Processo FAPESP: 18/14546-9 - Controle e coleta de energia de distúrbios vibro-acústicos de baixa frequência usando metaestruturas inteligentes
• Beneficiário: Jaime Alberto Mosquera Sánchez
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/15894-0 - Projeto e otimização de estruturas periódicas para aprimoramento de desempenho vibroacústico
• Beneficiário: Carlos de Marqui Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático