• Letter

Experimental Observation of Nonreciprocal Band Gaps in a Space-Time-Modulated Beam Using a Shunted Piezoelectric Array

J. Marconi, E. Riva, M. Di Ronco, G. Cazzulani, F. Braghin, and M. Ruzzene
Phys. Rev. Applied 13, 031001 – Published 27 March 2020
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Abstract

In this work, we experimentally achieve 1-kHz-wide directional band gaps for elastic waves spanning a frequency range from approximately 8 to 11 kHz. One-way propagation is induced by way of a periodic waveguide consisting of an aluminum beam partially covered by a tightly packed array of piezoelectric patches. The patches are connected to shunt circuits, where switches allow a periodic modulation in time of the beam properties. A traveling stiffness profile is imposed by phasing the modulation of each active element, inducing the propagation of a plane wave along the material and establishing unidirectional wave propagation at band-gap frequencies.

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  • Received 4 October 2019
  • Revised 14 January 2020
  • Accepted 6 March 2020

DOI:https://doi.org/10.1103/PhysRevApplied.13.031001

© 2020 American Physical Society

Physics Subject Headings (PhySH)

General Physics

Authors & Affiliations

J. Marconi1, E. Riva1,*, M. Di Ronco1, G. Cazzulani1, F. Braghin1, and M. Ruzzene2

  • 1Department of Mechanical Engineering, Politecnico di Milano, Milan 20156, Italy
  • 2Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA

  • *emanuele.riva@polimi.it

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Vol. 13, Iss. 3 — March 2020

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