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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Membrane smart metamaterials for unidirectional wave propagation problems

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Author(s):
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]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Sound and Vibration; v. 512, NOV 10 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 18/14546-9 - Control and energy harvesting from low-frequency vibro-acoustic disturbances with smart metastructures
Grantee:Jaime Alberto Mosquera Sánchez
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/05793-2 - Acoustic treatment via membrane-type metamaterials
Grantee:Lucas Yudi Moriya Sampaio
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 18/15894-0 - Periodic structure design and optimization for enhanced vibroacoustic performance: ENVIBRO
Grantee:Carlos de Marqui Junior
Support Opportunities: Research Projects - Thematic Grants