Ultralow-frequency broadband characteristics of stepwise radial metamaterials
Release time:2024-08-09
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- Affiliation of Author(s):
- 机电工程学院
- Journal:
- Journal of Applied Physics
- Key Words:
- PHONONIC CRYSTALS; GAPS; PROPAGATION
- Abstract:
- A new type of stepwise radial metamaterial (SRM) with ultralow-frequency and broadband characteristics is proposed in this study. In contrast to the traditional radial metamaterial (TRM), the proposed structure is periodically arranged in a stepwise shape along the radial direction. The propagation characteristics of Lamb waves in the SRM were investigated using the finite element method. For the numerical analysis, the degeneracy between the bands of the SRM was separated, resulting in the opening of the bandgaps in the ultralow-frequency range. The total bandwidth was 75 times that of the TRM, and the wave attenuation ability was increased by more than 70%. The introduction of a stepwise array in the SRM opened up the local resonance and Bragg scattering bandgaps, and as a result, the SRM exhibited ultralow-frequency broadband characteristics. Furthermore, the influences of the structural parameters of the SRM on the bandgap characteristics were discussed. With the increase in the stepped angle, the coupling relationship between the Lamb wave mode and the local resonance was enhanced, which caused the band structure to shift to a lower frequency. In addition, the hole rotation and shape played important roles in the bandgap tuning. Finally, the experimental sample was processed based on the model, and the vibration propagation characteristics were tested to prove its ultralow-frequency broadband characteristics. The proposed shielding approach could provide a better alternative in the field of ultralow-frequency noise reduction and vibration reduction.
- First Author:
- Liling,liuhaixia,同志学,lilixia
- Indexed by:
- Journal paper
- Correspondence Author:
- 何伟涛,贾淇,李鹏国
- Volume:
- 132/14/1-16
- ISSN No.:
- 0021-8979
- Translation or Not:
- no
- Date of Publication:
- 2022-10-14