Piezoelectric resonator arrays for tunable acoustic waveguides and metamaterials

By F. Casadei, Tommaso Delpero, A. Bergamini, P. Ermanni, Massimo Ruzzene. 2012

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Reconfigurable origami-inspired acoustic waveguides (2016, background): “While in most of the reported metamaterials the functionality is locked into place once they are fabricated, tunability has also been demonstrated by rotation of the scatterers [29–32], thermal radiation [33], adjustable resonating components [34, 35] and applied mechanical deformation [36].”
Elastic metamaterials and dynamic homogenization: a review (2014, background): “These include multiply resonant microstructures that lead to density and some components of the modulus tensor simultaneously becoming negative [36], periodic array of curled perforations [37,38], tunable piezoelectric resonator arrays [39], anisotropic LHMs by arranging layers of perforated plates ”
A hybrid elastic metamaterial with negative mass density and tunable bending stiffness (2017, background): “…components connected to inductor-resistor (LR) shunt circuits appear as a promising passive technique for noise and vibration control in dynamic structures ( Airoldi and Ruzzene, 2011; Chen et al., 2013; Forward, 1979; Hagood and von Flotow, 1991; Bergamini et al., 2014; Casadei et al., 2012 ).”