Membrane smart metamaterials for unidirectional wave propagation problems

Autor(es)

Sampaio, Lucas Y. M. ^[1] ; Rodrigues, Gabriel K. ^{[1, 2]} ; Mosquera-Sanchez, Jaime A. ^[3] ; De Marqui Jr, Carlos ; de Oliveira, Leopoldo P. R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mech Engn, Ave Trabalhador Sancarlense 400, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Udine, Polytech Dept Engn & Architecture DPIA, Via Sci 208, I-33100 Udine - Italy

^[3] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Aeronaut Engn, Ave Joao Dagnone 1100, BR-13536120 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sound and Vibration; v. 512, NOV 10 2021.
• Citações Web of Science: 0

Resumo

Acoustic metamaterials can be realised by the periodic distribution of features that vary from rigid inclusions and discontinuous cuts to sub-wavelength resonators. The use of lightweight elements in the resonator design gave rise to membrane-type acoustic metamaterials (MAMs), which exhibit relevant attenuation on a narrow frequency range. The use of smart materials, resulting in smart MAMs, paves the way towards tunable systems that can improve the attenuation performance at different frequency ranges. This work presents a numerical and experimental investigation on the use of smart MAMs for addressing unidirectional acoustic perturbation through the combination of a prestressed membrane with shunted piezoelectric elements. A concept unit cell has been modelled using fully coupled electro-vibroacoustic finite elements and verified experimentally in an impedance tube, adapted for sound transmission loss (STL) measurements. Then, a novel acoustic metamaterial is proposed by arranging a number of the proposed unit cells along the wave propagation direction. Numerical exercises, based on the validated unit cell model, show the formation of an electroelastic attenuation band around the first open-circuit membrane mode. The smart MAM is capable of delivering large STL, not only at the membrane anti-resonance, as expected, but also at a band around the first resonance frequency, showing a promising application for an effective, lightweight acoustic barrier. (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: 18/05793-2 - Tratamento acústico com metamateriais de membrana
• Beneficiário: Lucas Yudi Moriya Sampaio
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• 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