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Crystals 2017, 7(12), 366; https://doi.org/10.3390/cryst7120366

Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling

Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, School of Aeronautics and Astronautics, Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China
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Academic Editors: Abdelkrim Khelif and Sarah Benchabane
Received: 15 October 2017 / Revised: 20 November 2017 / Accepted: 6 December 2017 / Published: 8 December 2017
(This article belongs to the Special Issue Phononics)
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Abstract

We experimentally and theoretically investigate the band-gap and transmission properties of phononic crystal (PC) beams immersed in water. Spectral element method (SEM) is developed for theoretical analysis in which the hydrodynamic loading is taken into consideration. Influence of the hydrodynamic loading on band-gap and transmission properties of the PC beams are studied. To directly detect the displacement transmission of a fully or partially submerged PC beam, a fiber Bragg grating (FBG) displacement sensing system is set up. Agreement between the experimental results and theoretical/numerical calculations also indicates the excellent dynamic sensing performance of the FBG sensing system in the research of the fluid-structure interaction (FSI) problem. Obvious lowering of the band gaps due to fluid-solid coupling is clearly demonstrated. The results in this work might be useful in research such as active tuning of the band gap and transmission properties of the PCs through fluid-solid coupling. View Full-Text
Keywords: fluid-solid interaction (FSI); band gaps; displacement transmission; phononic crystals (PCs); fiber Bragg gratings (FBGs) fluid-solid interaction (FSI); band gaps; displacement transmission; phononic crystals (PCs); fiber Bragg gratings (FBGs)
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Fang, X.; Chuang, K.-C.; Yuan, Z.-W.; Huang, Z.-L. Experimental and Theoretical Investigation of Lowering the Band Gaps of Phononic Crystal Beams through Fluid-Solid Coupling. Crystals 2017, 7, 366.

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