In order to solve the problem of strong penetration and difficult attenuation of low-frequency sound wave in traditional materials, several three-dimensional acoustic black hole superstructures are designed. First of all, multi-stage acoustic black holes are designed. It is found that their sound insulation coefficient is about 0.9 in the frequency range of 50–1600 Hz when the ration of the outlet tip diameter to the inlet diameter is [Formula: see text]. Then, the acoustic black hole thin and light superstructure was designed by embedding many acoustic black hole units in an array on the 10 mm thick plate. The sound insulation coefficient of two samples embedded 81 or 144 acoustic black holes is above 0.96 in the frequency range of 50–1600 Hz. To facilitate processing and engineering applications, we designed acoustic black hole wedge-shaped plate superstructures, and found that the average sound insulation of these acoustic black hole superstructures is 30 dB in the frequency range of 50–1600 Hz. These superstructures will be widely used in anechoic rooms, factories and aviation.

中文翻译：

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三维声学黑洞超结构低频宽带特性研究

为解决传统材料中低频声波穿透力强、衰减困难的问题，设计了几种三维声学黑洞超结构。首先，设计了多级声学黑洞。研究发现，当出口尖端直径与入口直径之比为[公式：见正文]时，它们的隔声系数在50-1600Hz频率范围内约为0.9。然后，通过在 10 mm 厚的板上以阵列形式嵌入多个声学黑洞单元，设计了声学黑洞轻薄上层建筑。嵌入 81 或 144 个声学黑洞的两个样品的隔声系数在 50-1600 Hz 的频率范围内均在 0.96 以上。为了便于加工和工程应用，我们设计了声学黑洞楔形平板上层建筑，发现这些声学黑洞上层建筑在 50-1600 Hz 的频率范围内平均隔音为 30 dB。这些上层建筑将广泛用于消声室、工厂和航空。