Novel small-size seismic metamaterial with ultra-low frequency bandgap for Lamb waves

IF 1.8 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

EPL Pub Date : 2024-08-26 DOI:10.1209/0295-5075/ad6bba

Nannan Shi, Han Liu and Liutao Zhao

引用次数: 0

Abstract

Seismic metamaterials (SMs) possess bandgap characteristics, enabling effective attenuation of seismic waves within a specific frequency range. However, small-sized SMs typically struggle to achieve a wide low-frequency bandgap. This paper proposes four types of SMs. The dispersion curves of these models were analyzed, and their vibration modes were studied to elucidate the bandgap mechanism. To investigate the influence of structural parameters on the bandgap, geometric variables are analyzed. Subsequently, the spectrum and acceleration time history curves of Lamb waves in a finite SM system are analyzed to verify the bandgap's authenticity. The designed structure exhibits a bandgap ranging from 1.24 Hz to 16.86 Hz, with a relative bandwidth as high as 172.6% and over 96% maximum vibration displacement attenuation of the El Centro seismic wave. The designed SMs effectively cover the 2 Hz seismic peak spectrum that leads to structural damage. They possess ideal relative bandwidth and excellent isolation performance, further advancing the engineering application of SMs.

查看原文本刊更多论文

具有超低频带隙的新型小尺寸地震超材料，适用于 Lamb 波

地震超材料（SM）具有带隙特性，可在特定频率范围内有效衰减地震波。然而，小尺寸超材料通常难以实现较宽的低频带隙。本文提出了四种 SM。分析了这些模型的频散曲线，并研究了它们的振动模式，以阐明带隙机制。为了研究结构参数对带隙的影响，本文分析了几何变量。随后，分析了有限 SM 系统中 Lamb 波的频谱和加速度时间历史曲线，以验证带隙的真实性。设计结构的带隙范围为 1.24 Hz 至 16.86 Hz，相对带宽高达 172.6%，对 El Centro 地震波的最大振动位移衰减超过 96%。所设计的 SM 能有效覆盖导致结构损坏的 2 Hz 地震峰值频谱。它们具有理想的相对带宽和优异的隔离性能，进一步推动了 SM 的工程应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

EPL 物理-物理：综合

CiteScore

3.30

自引率

5.60%

发文量

332

审稿时长

1.9 months

期刊介绍： General physics – physics of elementary particles and fields – nuclear physics – atomic, molecular and optical physics – classical areas of phenomenology – physics of gases, plasmas and electrical discharges – condensed matter – cross-disciplinary physics and related areas of science and technology. Letters submitted to EPL should contain new results, ideas, concepts, experimental methods, theoretical treatments, including those with application potential and be of broad interest and importance to one or several sections of the physics community. The presentation should satisfy the specialist, yet remain understandable to the researchers in other fields through a suitable, clearly written introduction and conclusion (if appropriate). EPL also publishes Comments on Letters previously published in the Journal.