Experimental demonstration of rainbow trapping of elastic waves in two-dimensional axisymmetric phononic crystal platesa)

Document Type

Article

Publication Date

3-1-2024

Abstract

Structures with specific graded geometries or properties can cause spatial separation and local field enhancement of wave energy. This phenomenon is called rainbow trapping, which manifests itself as stopping the propagation of waves at different locations according to their frequencies. In acoustics, most research on rainbow trapping has focused on wave propagation in one dimension. This research examined the elastic wave trapping performance of a two-dimensional (2D) axisymmetric grooved phononic crystal plate structure. The performance of the proposed structure is validated using numerical simulations based on finite element analysis and experimental measurements using a laser Doppler vibrometer. It is found that rainbow trapping within the frequency range of 165-205 kHz is achieved, where elastic waves are trapped at different radial distances in the plate. The results demonstrate that the proposed design is capable of effectively capturing elastic waves across a broad frequency range of interest. This concept could be useful in applications such as filtering and energy harvesting by concentrating wave energy at different locations in the structure.

Identifier

85186755647 (Scopus)

Publication Title

Journal of the Acoustical Society of America

External Full Text Location

https://doi.org/10.1121/10.0025179

e-ISSN

15208524

ISSN

00014966

PubMed ID

38436424

First Page

1759

Last Page

1766

Issue

3

Volume

155

Grant

CBET-2243507

Fund Ref

National Science Foundation

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