2022
DOI: 10.1016/j.eml.2022.101649
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Experimental demonstration of extremely asymmetric flexural wave absorption at the exceptional point

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Cited by 17 publications
(13 citation statements)
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“…Another identical cube functions as a support connected to the other end but on the bottom surface of this beam strip. In our previously investigated coupled mechanical resonators on a two-port system [27], we demonstrated that the coupling distance and the mechanical damping played essential roles in achieving perfect absorption due to the scattering toward the two ports as well as the neighboring resonators. Here, in the one port system as shown in Figure 1, we consider a general case where the scatterer is placed at x = d away from the free end.…”
Section: Designmentioning
confidence: 99%
See 3 more Smart Citations
“…Another identical cube functions as a support connected to the other end but on the bottom surface of this beam strip. In our previously investigated coupled mechanical resonators on a two-port system [27], we demonstrated that the coupling distance and the mechanical damping played essential roles in achieving perfect absorption due to the scattering toward the two ports as well as the neighboring resonators. Here, in the one port system as shown in Figure 1, we consider a general case where the scatterer is placed at x = d away from the free end.…”
Section: Designmentioning
confidence: 99%
“…An artificial absorbing layer made with high damping materials is carefully placed on the surface of the left end of the host beam to suppress the reflected waves from that boundary. A laser vibrometer is used to scan the pointwise velocity responses of the host beam in the highlighted orange region with 21 points and a point distance of 5 mm [27]. The measured responses are processed to calculate the wave reflection (r) and absorption (α = 1 − r) coefficients.…”
Section: Sample Fabrication and Experimental Setupmentioning
confidence: 99%
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“…The EP not only can be used for the UZR but also can achieve the unidirectional perfect absorption (UPA), which provides convenience for designing dynamic control devices [27]. To obtain the UPA, Li et al [28] constructed an asymmetrical metabeam with a pair of loss-induced asymmetrical resonators to find the EP and the critical coupling condition for extremely asymmetric flexural wave absorption based on the intrinsic viscosity loss. However, the EP and the UPA were determined and found to be not tunable for their fabricated asymmetrical metabeam.…”
Section: Introductionmentioning
confidence: 99%