Low-frequency band gaps in a metamaterial rod by negative-stiffness mechanisms: Design and experimental validation

被引：100
作者：
Wang, Kai [1 ,2 ]
Zhou, Jiaxi [1 ,2 ]
Wang, Qiang [1 ,2 ]
Ouyang, Huajiang [3 ]
Xu, Daolin [1 ,2 ]
机构：
[1] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Coll Mech & Vehicle Engn, Changsha 410082, Hunan, Peoples R China
[3] Univ Liverpool, Sch Engn, Liverpool L69 3GH, Merseyside, England
来源：
APPLIED PHYSICS LETTERS | 2019年 / 114卷 / 25期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
WAVE; PERFORMANCE; PLATE; BEAMS;
D O I：
10.1063/1.5099425
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A metamaterial rod with resonators containing negative-stiffness (NS) mechanisms is proposed for generating very low-frequency bandgaps. The underlying principle employs the NS mechanism (a pair of mutual repelling permanent magnet rings) to partially or totally neutralize the stiffness of the positive-stiffness element (two coil springs) of the resonator and thus to achieve an ultralow, even zero, stiffness, which enables a significant shift of the bandgap from a high frequency to a low one. Experiments on the restoring force feature of the resonator and the bandgap of the metamaterial rod are carried out, which provide sufficient evidence to validate the proposed concept for substantially lowering bandgaps in locally resonant metamaterials. This study opens a potential path to manipulate elastic waves within a very low-frequency range.
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页数：4
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