Low-frequency and wide bandgap seismic metamaterials for Rayleigh wave attenuation

Zhang, Kai; Yu, Jiang; Liu, Hong; Ding, Bin; Deng, Zichen

doi:10.1016/j.engstruct.2023.116948

Cited by 6 publications

(1 citation statement)

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“…Phononic crystals and metamaterials [7][8][9], a class of artificial periodical structures that exhibit excellent performance on vibration attenuation [10,11] and noise reduction [12,13], have been significantly explored and developed. Generally, there are two mainstream mechanisms to design metastructure, either Bragg scattering or local resonance [14][15][16][17][18][19]. With the help of heuristic optimization and gradient-based methods, Xie et al [20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical metastructure with embedded phononic crystal for flexural wave attenuation

Liu,

Wan Kim,

Yoon

et al. 2024

Smart Mater. Struct.

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Destructive interference-based metamaterials have shown excellent characteristics in elastic wave manipulation and vibration attenuation. Nevertheless, challenges persist in the application due to limited space and lightweight design, as current metastructures require additional beam structure. To simplify the design of metamaterials for flexural wave manipulation, this paper presents a new class of embedded phononic crystal for manipulating flexural wave propagation in both one and two-dimensional space by taking advantage of destructive interference, which can effectively suppress the mechanical vibration of a beam structure with a broad band gap. The flexural wave dispersion characteristic in a non-uniform beam structure is derived based on the Euler–Bernoulli beam theory, and an embedded phononic structure with the mechanism of destructive interference is presented to demonstrate its effectiveness in mitigating mechanical vibration. Subsequently, four typical units of embedded phononic structures are designed for attenuating flexural wave propagation in a beam structure. Finally, both numerical simulations, including one and two-dimensional phononic crystals, and physical experiments are implemented to evaluate the performance of the presented metastructure for flexural wave manipulation, which indicates that the proposed embedded phononic structures can effectively mitigate structural vibration in the low-frequency domain. To the best of our knowledge, it is the first attempt to design the metabeam with embedded phononic structures by taking advantage of destructive interference.

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