Asymmetric Lamb wave propagation in phononic crystal slabs with graded grating

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  • Jiu-jiu Chen
    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University , Changsha 410082, People’s Republic of China
  • Xu Han
    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University , Changsha 410082, People’s Republic of China
  • Guang-Yao Li
    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University , Changsha 410082, People’s Republic of China

Bibliographic Information

Published
2013-05-10
DOI
  • 10.1063/1.4804323
Publisher
AIP Publishing

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<jats:p>Asymmetric Lamb wave propagation is important for control and manipulation of the Lamb wave signals in various devices. Through numerical simulation of the Lamb wave propagation in phononic crystal slabs with graded grating, we proposed and studied a linear phononic device that shows asymmetric Lamb wave transmission in low-frequency domains. This exotic phenomenon stems from the threshold frequency of the fundamental antisymmetric Lamb mode conversion to the fundamental symmetric Lamb mode is different at the different locations of the acoustic diode. Remarkably, a bi-directional asymmetric Lamb wave propagation is achieved by tuning the grade of the grating depths. The back propagating acoustic waves of the second band of hybridized Lamb modes plays the essential role in the phenomena for relatively high-frequency regions. This should be potentially significant in helping design chip-scale integrated phononic devices.</jats:p>

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