Abstract This study presents locally resonant acoustic metamaterials made of continuous carbon-fiber-reinforced plastics for vibration attenuation. Unit cells were designed such that the attenuation of low-frequency vibration was compatible with high stiffness. The effect of the path and content of carbon fibers on the band gap was numerically investigated through band-structure analysis for periodic cells. We found that the band gap can be widened by an appropriate placement of carbon fibers in the unit cell. Furthermore, the band gap of the carbon-fiber reinforced metastructures was wider than that of the structures without fibers. Metamaterial samples composed of the designed unit cells were fabricated by 3D printing technique of fiber composites. The vibration transmissibility of the samples was measured and compared with the frequency response function computed by finite-element analysis. The frequency ranges with strong attenuation were in good agreement with those observed in the numerical analysis.

中文翻译：

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用于衰减宽带振动的局部共振碳纤维复合超结构的三维打印

摘要 本研究提出了由连续碳纤维增强塑料制成的用于振动衰减的局部共振声学超材料。单元格的设计使得低频振动的衰减与高刚度兼容。通过周期性电池的能带结构分析，数值研究了碳纤维的路径和含量对带隙的影响。我们发现可以通过在晶胞中适当放置碳纤维来加宽带隙。此外，碳纤维增强超结构的带隙比没有纤维的结构的带隙宽。由设计的晶胞组成的超材料样品是通过纤维复合材料的 3D 打印技术制造的。测量样品的振动传递率并与通过有限元分析计算的频率响应函数进行比较。具有强衰减的频率范围与数值分析中观察到的频率范围非常吻合。