4.6 Article

Dramatic bandwidth enhancement in nonlinear metastructures via bistable attachments

期刊

APPLIED PHYSICS LETTERS
卷 114, 期 9, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/1.5066329

关键词

-

资金

  1. Air Force Office of Scientific Research [FA9550-15-1-0397]

向作者/读者索取更多资源

We report amplitude-dependent substantial enhancement of the frequency bandwidth in locally resonant metamaterial-based finite structures (metastructures) via bistable attachments. The bistable magnetoelastic beam attachments of the unit cells exhibit linear intrawell, nonlinear intrawell, and nonlinear interwell oscillations for low, moderate, and sufficiently high intensity excitations, respectively. As a result, the overall metastructure leverages linear locally resonant bandgaps under low amplitudes and nonlinear attenuation due to wideband chaotic vibrations of the bistable attachments under large amplitudes. The concept was first demonstrated through a linear mass-spring chain with bistable attachments in a numerical case study. Experimental results and validations are then presented for a base-excited cantilever beam hosting seven bistable unit cells. Transition from linear locally resonant bandgaps to nonlinear attenuation is observed, and the amplitude-dependent bandwidth enhancement is shown. The bandwidth offered by nonlinear interwell oscillations is substantially wider than the linear locally resonant bandgap that is limited by the added mass.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据