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Forcing the Silence of the Lamb waves: Uni-directional propagation in structured gyro-elastic strips and networks
Michael Nieves  1@  , Giorgio Carta  2@  , Michele Brun  2@  
1 : Keele University
2 : University of Cagliari

We consider a gyro-elastic structured strip, formed from rods interconnecting periodically placed masses that are attached to gyroscopes. The presence of the gyroscopes makes the system non-reciprocal. Near bulk resonances of the strip, the medium is capable of supporting uni-directional Lamb waves when subjected to forcing [1]. We discuss the solution to this problem and demonstrate how these near-resonance effects can lead to designs of novel waveguides. Namely, we illustrate how we can create a network of structured strips that is capable of channelling the energy supplied by an external source towards any of its endpoints, which can be chosen arbitrarily and in advance.

[1] G. Carta, M.J., Nieves, M. Brun, (2023): Forcing the Silence of the Lamb waves: Uni-directional propagation in structured gyro-elastic strips and networks, Eur. J. Mec. A-Solid 101, 105070

 


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