Low-frequency elastic wave attenuation in a composite acoustic black hole beam

Low-frequency elastic wave attenuation in a composite acoustic black hole beam
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复合声学黑洞梁中的低频弹性波衰减

DOI:
10.1016/j.apacoust.2019.04.029
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发表时间:
2019-11
期刊:
影响因子:
3.4
通讯作者:
Hou Hong
Hou Hong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gao Nansha;Wei Zhengyu;Zhang Ruihao;Hou Hong

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本研究讨论了具有低频弯曲波衰减特性的复合声学黑洞(ABH)梁结构。能带结构表明,所提出的结构可以克服传统声学黑洞无法在低频应用的限制。通过引入乙烯醋酸乙烯酯(EVA)夹层,复合梁结构没有表现出必要的低局部刚度或高应力集中,振动模式表明弯曲波衰减仍然取决于ABH。此外,EVA材料的尺寸仅影响第二弯曲带隙的上边界,但影响第三弯曲BG的两个边界。不同材料的弹性常数对前三个BG影响很大。振动实验证明了复合ABH梁的效果并验证了我们的结果。这项研究在控制振动传播方面具有潜在的应用,并且可能对低频振动滤波器的设计有用。
This study discusses the composite acoustic black hole (ABH) beam structure with low-frequency flexural wave attenuation properties. Band structures show that the proposed structure can overcome the limitation of conventional acoustic black holes, which cannot be applied at low frequency. By introducing an ethylene vinyl acetate (EVA) interlayer, the composite beam structure does not reveal the necessary low local stiffness or high stress concentration, vibration modes indicate that flexural wave attenuation still depends on the ABH. Furthermore, the size of the EVA material only affects the upper boundary of the second flexural bandgap but both boundaries of third flexural BG. Elastic constants of different materials have a great effect on the first three BGs. Vibration experiments prove the effect of the composite ABH beam and validate our results. This research has potential applications for controlling vibration propagation, and may be useful in low-frequency vibration filter design.
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