Loss of acoustic black hole effect in a structure of finite size
Loss of acoustic black hole effect in a structure of finite size
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有限尺寸结构中声学黑洞效应的损失
DOI：
10.1063/1.4955127
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发表时间：
2016-07
影响因子：
4
通讯作者：
Cheng Li
中科院分区：
文献类型：
--
作者：
Tang Liling;Cheng Li
声学黑洞（ABH）效应发生在薄壁结构中，由于弯曲波速度的降低，厚度逐渐减小。根据半无限大结构中的波传播理论，它被证明是一种宽带现象。ABH效应在被动振动控制、能量收集、声辐射控制等领域具有广泛的应用前景。在本文中，我们证明了ABH效应在有限梁在特定的频率范围内的截止频率以上的消失，实验和理论。分析表明，该现象发生在频率接近的低阶局部共振频率的梁的部分划分的激振力的位置。可以预测这些频率，从而可以避免ABH应用中目标频率范围的现象。
The Acoustic Black Hole (ABH) effect takes place in thin-walled structures with diminishing thickness as a result of the reduction in the bending wave speed. It was shown to exist as a broadband phenomenon, based on wave propagation theory in structures of semi-infinite size. The ABH effect exhibits appealing features for various applications, such as passive vibration control, energy harvesting, and sound radiation control. In this paper, we demonstrate the disappearance of the ABH effect in a finite beam at specific frequency ranges above the cut-on frequency, both experimentally and theoretically. Analyses show that the phenomenon takes place at frequencies which are close to the low order local resonant frequencies of the portion of the beam demarcated by the position of the excitation force. These frequencies can be predicted so that the phenomenon can be avoided for the targeted frequency ranges in ABH applications.
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