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1 April 2019 Space-time modulated programmable metamaterial beam for nonreciprocal control of flexural waves (Conference Presentation)
Yangyang Chen, Xiaopeng Li, Hussein Nassar, Guoliang Huang
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Proceedings Volume 10972, Health Monitoring of Structural and Biological Systems XIII; 109720F (2019) https://doi.org/10.1117/12.2514165
Event: SPIE Smart Structures + Nondestructive Evaluation, 2019, Denver, Colorado, United States
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.
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Yangyang Chen, Xiaopeng Li, Hussein Nassar, and Guoliang Huang "Space-time modulated programmable metamaterial beam for nonreciprocal control of flexural waves (Conference Presentation)", Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109720F (1 April 2019); https://doi.org/10.1117/12.2514165
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KEYWORDS
Modulation
Metamaterials
Acoustics
Beam controllers
Signal processing
Finite element methods
Resonators
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