A periodic array of shunted piezoelectric patches is used to produce a two-dimensional metamaterial with tunable properties. The proposed configuration exploits the waveguiding capabilities of a phononic crystal plate in conjunction with a periodic arrangement of eight surface-bonded PZT disks. Each piezo transducer is connected to an independent resistive-inductive network, so that the system features an internal resonance that occurs at the tuning frequency of the shunting circuits. The dispersion relations of the resulting metamaterial are experimentally estimated through detailed mappings of the wavefield measured using a scanning laser doppler vibrometer. Experimental results indicate that the coupled system features a band structure behavior induced by the internal resonance of the electrical networks, and suggest the possibility to alter the waveguiding properties of the considered metamaterial without modifying the physical structure of the phononic crystal plate.
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ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
September 19–21, 2012
Stone Mountain, Georgia, USA
Conference Sponsors:
- Aerospace Division
ISBN:
978-0-7918-4510-3
PROCEEDINGS PAPER
Experimental Characterization of Two-Dimensional Tunable Metamaterials
Tommaso Delpero,
Tommaso Delpero
Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
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Paolo Ermanni,
Paolo Ermanni
Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
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Filippo Casadei,
Filippo Casadei
Georgia Institute of Technology, Atlanta, GA
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Massimo Ruzzene,
Massimo Ruzzene
Georgia Institute of Technology, Atlanta, GA
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Andrea Bergamini
Andrea Bergamini
EMPA, Dübendorf, Switzerland
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Tommaso Delpero
Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
Paolo Ermanni
Swiss Federal Institute of Technology (ETH), Zürich, Switzerland
Filippo Casadei
Georgia Institute of Technology, Atlanta, GA
Massimo Ruzzene
Georgia Institute of Technology, Atlanta, GA
Andrea Bergamini
EMPA, Dübendorf, Switzerland
Paper No:
SMASIS2012-8087, pp. 187-193; 7 pages
Published Online:
July 24, 2013
Citation
Delpero, T, Ermanni, P, Casadei, F, Ruzzene, M, & Bergamini, A. "Experimental Characterization of Two-Dimensional Tunable Metamaterials." Proceedings of the ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 2: Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Bio-Inspired Materials and Systems; Energy Harvesting. Stone Mountain, Georgia, USA. September 19–21, 2012. pp. 187-193. ASME. https://doi.org/10.1115/SMASIS2012-8087
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