scholarly journals Subwavelength and directional control of flexural waves in zone-folding induced topological plates

2018 ◽  
Vol 97 (5) ◽  
Author(s):  
Rajesh Chaunsali ◽  
Chun-Wei Chen ◽  
Jinkyu Yang
Keyword(s):  
Flexural Waves ◽  
Directional Control ◽  
Zone Folding

scholarly journals One-way interfacial waves in a flexural plate with chiral double resonators

2019 ◽  
Vol 378 (2162) ◽  
pp. 20190350 ◽  
Author(s):  
G. Carta ◽  
D. J. Colquitt ◽  
A. B. Movchan ◽  
N. V. Movchan ◽  
I. S. Jones
Keyword(s):  
Wave Propagation ◽  
Harmonic Excitation ◽  
Flexural Waves ◽  
Interfacial Wave ◽  
New Approach ◽  
Structured Media ◽  
Directional Control ◽  
Time Harmonic ◽  
External Time ◽  
Dynamic Phenomena

In this paper, we demonstrate a new approach to control flexural elastic waves in a structured chiral plate. The main focus is on creating one-way interfacial wave propagation at a given frequency by employing double resonators in a doubly periodic flexural system. The resonators consist of two beams attached to gyroscopic spinners, which act to couple flexural and rotational deformations, hence inducing chirality in the system. We show that this elastic structure supports one-way flexural waves, localized at an interface separating two sub-domains with gyroscopes spinning in opposite directions, but with otherwise identical properties. We demonstrate that a special feature of double resonators is in the directional control of wave propagation by varying the value of the gyricity, while keeping the frequency of the external time-harmonic excitation fixed. Conversely, for the same value of gyricity, the direction of wave propagation can be reversed by tuning the frequency of the external excitation. This article is part of the theme issue ‘Modelling of dynamic phenomena and localization in structured media (part 2)’.

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