Bibliographic Details
| Title: |
Ultra-low-frequency broadband characteristics of radial gradient supercell seismic metamaterials. |
| Alternate Title: |
径向梯度超元胞地震超材料的甚低频超宽带的减振特性. |
| Authors: |
LI Lixia1 jieli_18@163.com, LI Yan1, LIU Haixia1 |
| Source: |
Journal of Measurement Science & Instrumentation. Sep2025, Vol. 16 Issue 3, p446-455. 10p. |
| Subjects: |
Lamb waves, Surface waves (Fluids), Metamaterials, Finite element method, Base isolation system |
| Abstract (English): |
This study aims to discuss the propagation characteristics of seismic Lamb wave and surface wave in a new radial gradient supercell seismic metamaterial (RGSSM). Different from the traditional seismic metamaterials with simple unit cells, the RGSSM consists of the supercells arranged periodically along the radial direction, and these supercells are composed of five kinds of unit cells with gradient filling rates. The dispersion curve and attenuation spectrum of the Lamb wave in RGSSM are studied with the finite element method combined with the supercell technology, generating a very low-frequency ultra-wide bandgap of 3.98-20 Hz, and a forbidden band generated by the localized modes forms multi-harmonic oscillators inside the supercell. Furthermore, it is found that the Young's modulus of the soil is more sensitive to the effect of bandgap. In terms of surface wave, the RGSSM can produce rapid attenuation in the low frequency range of 5.2-8.5 Hz. Finally, a 3D model is designed to demonstrate the shielding performance of RGSSM against the seismic surface wave. The proposed RGSSM provides a new idea for the seismic isolation of ultra-wide and low-frequency seismic waves. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
针对地震兰姆（Lamb）波和面波在一种新型径向梯度超元胞地震超材料（ Radial gradient supercell seismic metamaterial, RGSSM）中的传播特性进行了研究。与传统地震超材料的简单单胞不同, RGSSM 由超元胞沿径向呈周期性排列构成, 其超元胞 由五种填充率呈梯度的单胞组成。采用有限元法结合超元胞技术研究Lamb 波在RGSSM 中的色散曲线和衰减谱, 发现有 3. 98-20 Hz 的甚低频超宽禁带生成。对特殊点的模态振型分析显示, 超宽禁带由超元胞内部形成多谐振子的局域化模态产生。 进一步研究显示, 土壤的杨氏模量对带隙效应更加敏感。对于表面波而言, RGSSM 在5. 2-8. 5 Hz 的低频范围内对Lamb 波和表 面波可产生良好的衰减效果。最后, 采用设计的三维模型展示了RGSSM 对地震表面波的屏蔽性能。本研究所提出的RGSSM 可 为超宽低频的地震波隔振提供新思路. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
