Broadband locally resonant band gaps in periodic beam structures with embedded acoustic black holes

Broadband locally resonant band gaps in periodic beam structures with embedded acoustic black holes
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嵌入声学黑洞的周期性梁结构中的宽带局部谐振带隙

DOI:
10.1063/1.4983459
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发表时间:
2017-05
影响因子:
3.2
通讯作者:
Cheng Li
Cheng Li
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Tang Liling;Cheng Li

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声学黑洞(ABH)效应可通过在具有幂律厚度变化的薄壁结构中捕获弯曲波来有效减少结构振动。在本研究中,我们使用小波分解能量方法来研究嵌入多个 ABH 的欧拉-伯努利梁。在仅包含少量 ABH 元件的波束中观察到相对较低频率的宽带传输衰减带。为了解释潜在的现象,分析了具有周期性 ABH 元素的无限结构。数值结果表明,基于有限模型的晶胞位移和旋转斜率的周期性边界条件足以描述能带结构,而不需要对整个无限结构进行全面处理。这提供了一种有效且灵活的方法来预测并最终优化基于单个元素的能带结构。同时,ABH 引起的局部谐振带隙与衰减一致......
The Acoustic Black Hole (ABH) effect can be used to effectively reduce structural vibrations by trapping flexural waves in a thin-walled structure with a power-law thickness variation. In the present study, we used a wavelet-decomposed energy method to investigate an Euler-Bernoulli beam embedded with multiple ABHs. Broadband transmission attenuation bands at relatively low frequencies are observed in a beam containing only a few ABH elements. To explain the underlying phenomena, an infinite structure with periodic ABH elements is analyzed. Numerical results show that the periodic boundary conditions in terms of displacement and rotational slope of a unit cell, based on the finite model, are sufficient to describe the band structures, without requiring full treatment of the entire infinite structure. This provides an efficient and flexible means to predict, and eventually optimize, the band structure based on a single element. Meanwhile, the ABH-induced locally resonant band gaps coincide with the attenua...
通过修改厚度剖面和扩展平台增强梁中的声学黑洞效应
DOI: 10.1016/j.jsv.2016.11.010
发表时间: 2017-03
影响因子: 4.7
作者:
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