Space-time wave localization in electromechanical metamaterial beams with programmable defects

Author(s)

Thomes, Renan Lima ^[1] ; Beli, Danilo ^[1] ; De Marqui Junior, Carlos ^[1]

Affiliation

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Aeronaut Engn, Av Trab Sao Carlense, BR-13566590 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: MECHANICAL SYSTEMS AND SIGNAL PROCESSING; v. 167, n. B MAR 15 2022.
• Web of Science Citations: 0

Abstract

A relevant feature for various applications of phononic crystals and metamaterials is the wave localization and guiding using defects introduced into a periodic array. In this context, we present a flexible localization of elastic waves in piezoelectric metamaterial beams with space- time-modulated defects. The vibration energy, originally confined in a point defect, is gradually manipulated in space and time as the inductances of the shunt circuits of subsequent unit cells are properly controlled, perfectly inducing energy localization at the final defect position. This wave localization by programmable defects is also applied to a two-dimensional triangular lattice composed by piezoelectric metamaterial beams, which illustrates the potential and versatility of the proposed strategy in more complex systems. The space-time modulation of point defects presented in this work opens new possibilities for programmable wave localization, and hence, manipulation of vibration energy or information using smart metamaterials, with applications that may involve guiding, sensing, monitoring and energy harvesting. (AU)

• FAPESP's process: 18/18774-6 - Manipulating Mechanical Waves Using Programmable Periodic Structures
• Grantee: Danilo Beli
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• 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