Tapered rainbow metabeam for wideband multimode acoustic blocking based on quadruple-mode resonators
Tapered rainbow metabeam for wideband multimode acoustic blocking based on quadruple-mode resonators
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DOI：
10.1063/5.0098371
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发表时间：
2022-09
影响因子：
4
通讯作者：
Hayato Takeda;Eikai Murakami;M. Tomoda;O. Matsuda;K. Fujita;O. Wright
中科院分区：
文献类型：
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作者：
Hayato Takeda;Eikai Murakami;M. Tomoda;O. Matsuda;K. Fujita;O. Wright
我们构建了一种彩虹超材料，用于在宽范围的亚千赫频率上阻隔多模声音，其形式为加工单元的锥形矩形横截面梁，基于平均而言可以同时衰减大多数可能的弹性波极化的元件。使用铝，我们构建了一个五单元结构，其中包含相互连接的亚波长平面谐振器，它们耦合到压缩振动、面内剪切振动、弯曲振动和扭转振动。在数值模拟的支持下，我们验证了这种锥形结构平均可以在组合的超材料带隙的频率范围内，即在代表∼50%的频率范围内，在∼0.7 kHz附近，强烈衰减声学模式。应用包括隔振。
We construct a rainbow metamaterial for multimode sound blocking over a broad range of sub-kHz frequencies in the form of a tapered rectangular cross section beam of machined cells based on elements that can, on average, simultaneously attenuate the majority of the possible elastic-wave polarizations. Using aluminum, we construct a five-cell structure containing sub-wavelength planar resonators with interconnected ribs, which couple to compressional, in-plane shear, flexural, and torsional vibrations. Backed up by numerical simulations, we verify that this tapered structure can, on average, strongly attenuate acoustic modes over the frequency range of the combined metamaterial bandgaps, that is over a frequency range representing ∼50% around ∼0.7 kHz. Applications include vibration isolation.