Wave propagation in viscoelastic phononic crystal rods with internal resonators

Lou, J, He, L, Yang, J, Kitipornchai, S and Wu, H 2018, 'Wave propagation in viscoelastic phononic crystal rods with internal resonators', Applied Acoustics, vol. 141, pp. 382-392.

Document type: Journal Article
Collection: Journal Articles

Title Wave propagation in viscoelastic phononic crystal rods with internal resonators
Author(s) Lou, J
He, L
Yang, J
Kitipornchai, S
Wu, H
Year 2018
Journal name Applied Acoustics
Volume number 141
Start page 382
End page 392
Total pages 11
Publisher Pergamon Press
Abstract In the present work, the wave propagation in a viscoelastic phononic crystal rod with internal periodic dissipative resonators is investigated. The Kelvin-Voigt model is utilized to describe the viscoelastic behavior of host materials. The Bloch theorem is adopted to analyze the band structure of the rod. The effect of the free oscillation frequency of the resonators on the band structure is firstly studied. It is found that by tailoring the dynamic characteristics of the resonators, the coupling of the Bragg scattering (BS) and local resonance (LR) mechanisms can be harnessed to effectively widen the band gaps and enhance the wave attenuation. Then, the effects of the viscosity of the host materials and the damping of the resonators on the band structure, especially the two nearly coalescent band gaps (the first Bragg and LR ones), are investigated respectively. Furthermore, the combined effect of the two dissipative sources is also discussed. The present work is expected to be helpful to the design and applications of phononic crystals and metamaterials.
Subject Dynamics, Vibration and Vibration Control
Keyword(s) Band gap
Bragg scattering
Local resonance
DOI - identifier 10.1016/j.apacoust.2018.07.029
Copyright notice © 2018 Elsevier Ltd. All rights reserved.
ISSN 0003-682X
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