Metamaterial beam with embedded nonlinear vibration absorbers
Metamaterial beam with embedded nonlinear vibration absorbers
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DOI：
10.1016/j.ijnonlinmec.2017.10.002
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发表时间：
2018-01-01
影响因子：
3.2
通讯作者：
Lacarbonara, Walter
中科院分区：
文献类型：
--
作者：
Casalotti, Arnaldo;El-Borgi, Sami;Lacarbonara, Walter
本文研究了非线性超材料梁的多模减振能力。Euler-Bernoulli梁耦合到作为局部谐振器/吸振器的非线性弹簧质量子系统的分布式阵列上。首先利用周期结构的经典方法研究了超材料梁的动力学行为，利用该方法确定了单胞的频率阻带。随后，通过增加嵌入的非线性本征谐振器阵列，得到了用于研究多频阻带系统的超材料梁的频率响应。采用路径跟踪技术和微分进化优化算法相结合的方法，得到了非线性状态下超材料梁的最优频响曲线。使用局部吸振器，通过适当调整其本构参数，可以显著减少与最低三种振型相关的超材料梁的振荡。(C)2017爱思唯尔有限公司。保留所有权利。
In this work the multi-mode vibration absorption capability of a nonlinear metamaterial beam is investigated. A Euler-Bernoulli beam is coupled to a distributed array of nonlinear spring-mass subsystems acting as local resonators/vibration absorbers. The dynamic behavior of the metamaterial beam is first investigated via the classical approach employed for periodic structures by which the frequency stop bands of the single cell are determined. Subsequently, the frequency response is obtained for the metamaterial beam to study a multi-frequency stop band system by adding an array of embedded nonlinear local resonators. A path following technique coupled with a differential evolutionary optimization algorithm is adopted to obtain the optimal frequency-response curves of the metamaterial beam in the nonlinear regime. The use of the local absorbers, via a proper tuning of their constitutive parameters, allows a significant reduction of the metamaterial beam oscillations associated with the lowest three vibration modes. (C) 2017 Elsevier Ltd. All rights reserved.