Clamping Resonators for Low-Frequency S0 Lamb Wave Reflection

A recent elastic metamaterial study found that resonators that “clamp” a plate waveguide can be used to create a frequency stop-band gap. The result was that the resonator array can prohibit the propagation of an A0 Lamb wave mode. This study investigates whether the concept can be extended to S0 La...

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Bibliographic Details
Published in:Applied sciences 2019-01, Vol.9 (2), p.257
Main Authors: Hakoda, Christopher, Lissenden, Cliff, Shokouhi, Parisa
Format: Article
Language:English
Subjects:
Crystals
Design
Elastic scattering
Elastic waves
Fourier transforms
Incident waves
lamb wave
Lamb waves
low-frequency
Mathematical models
metamaterial
Metamaterials
Propagation
Resonance scattering
Resonant frequencies
resonator
Resonators
Wave dispersion
Wave reflection
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Summary:A recent elastic metamaterial study found that resonators that “clamp” a plate waveguide can be used to create a frequency stop-band gap. The result was that the resonator array can prohibit the propagation of an A0 Lamb wave mode. This study investigates whether the concept can be extended to S0 Lamb wave modes by designing resonators that can prohibit the propagation of S0 Lamb wave modes in a 1-mm aluminum plate waveguide at 50 kHz. The frequency-matched resonators did not reduce the transmitted signal, leading to the conclusion that the design concept of frequency-matched resonators is not always effective. On the other hand, the resonators designed to clamp the upper surface of the plate were very effective and reduced the transmitted signal by approximately 75%.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9020257