A nonlinear damped metamaterial: Wideband attenuation with nonlinear bandgap and modal dissipation

被引:25
作者
Zhao, Bao [1 ]
Thomsen, Henrik R. [1 ]
Pu, Xingbo [2 ]
Fang, Shitong [3 ]
Lai, Zhihui [3 ]
Van Damme, Bart [4 ]
Bergamini, Andrea
Chatzi, Eleni [1 ]
Colombi, Andrea [4 ,5 ]
机构
[1] Dept Civil, Dept Civil Environm & Geomat Engn, CH-8093 Zurich, Switzerland
[2] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[3] Shenzhen Univ, Coll Mechatron & Control Engn, Shenzhen 518060, Peoples R China
[4] Lab Acoust Noise Control, Empa Mat Sci & Technol, CH-8600 Dubendorf, Switzerland
[5] Zurich Univ Appl Sci ZHAW, CH-8401 Winterthur, Switzerland
基金
欧盟地平线“2020”; 瑞士国家科学基金会;
关键词
Nonlinear metamaterial; Nonlinear damping; Inertia amplifier; Broadband attenuation;
D O I
10.1016/j.ymssp.2023.111079
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
In this paper, we incorporate the effect of nonlinear damping with the concept of locally resonant metamaterials to enable vibration attenuation beyond the conventional bandgap range. The proposed design combines a linear host cantilever beam and periodically distributed inertia amplifiers as nonlinear local resonators. The geometric nonlinearity induced by the inertia amplifiers causes an amplitude-dependent nonlinear damping effect. Through the im-plementation of both modal superposition and numerical harmonic methods with Alternating Frequency Time and numerical continuation techniques, the finite nonlinear metamaterial is accurately modeled. The resulting nonlinear frequency response reveals the bandgap is both amplitude-dependent and broadened. Furthermore, the nonlinear interaction between the local resonators and the mode shapes of the host beam is discussed, which leads to efficient modal frequency dissipation ability. The theoretical results are validated experimentally. By embedding the nonlinear damping effect into locally resonant metamaterials, wideband and shock wave attenuation of the proposed metamaterial is achieved, which opens new possibilities for versatile metamaterials beyond the conventional bandgap ranges of their linear counterparts.
引用
收藏
页数:17
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