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Proceedings Paper

Space-time modulated programmable metamaterial beam for nonreciprocal control of flexural waves (Conference Presentation)
Author(s): Yangyang Chen; Xiaopeng Li; Hussein Nassar; Guoliang Huang

Paper Abstract

Reciprocity is a fundamental principle in acoustics, posing constraints on the way we process acoustic signals. Breaking reciprocity with spatiotemporal modulations provides an opportunity to design compact, low-energy, integrated non-reciprocal acoustic devices. Here, we design and experimentally demonstrate a space-time modulated programmable metamaterial beam with electromagnet resonators controlled by currents. A numerical approach based on the finite element method is developed for wave dispersion calculations of space-time modulated programmable metamaterials with complex geometries. Unidirectional band gaps are demonstrated experimentally and numerically in a good agreement. We quantify effects of the modulation amplitude and material damping in terms of band gap width and attenuation factor of the unidirectional band gaps in the space-time modulated metamaterial beam. Lastly, the unidirectional band gaps due to the second-order mode coupling caused by strong modulations are identified and examined numerically. Our design as well as the numerical approach provide a practical solution for the applications of non-reciprocal acoustic devices with spatiotemporal modulations.

Paper Details

Date Published: 1 April 2019
Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109720F (1 April 2019); doi: 10.1117/12.2514165
Show Author Affiliations
Yangyang Chen, Univ. of Missouri (United States)
Xiaopeng Li, Univ. of Missouri (United States)
Hussein Nassar, Univ. of Missouri (United States)
Guoliang Huang, Univ. of Missouri (United States)

Published in SPIE Proceedings Vol. 10972:
Health Monitoring of Structural and Biological Systems XIII
Paul Fromme; Zhongqing Su, Editor(s)

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