In this study, we introduce a -silencer designed for broadband low-frequency acoustic attenuation. Composed of four parallel resonators, each containing a coiled multi-slit, it employs rainbow trapping to realize effective low-frequency acoustic attenuation. The curved multiple slits produce an acoustic black hole effect that significantly assists in noise reduction within the low-frequency range. A cavity at the end of the multi-slit configuration further reduces low-frequency noise. Rainbow trapping achieves frequency-specific acoustic attenuation by inducing local resonances at frequencies where the group velocity of sound waves reaches zero. The coiled structure ensures that this occurs at a specific slit corresponding to a particular frequency, leading to improved broadband acoustic attenuation; the proposed -silencer operates across a broad bandwidth above 728 Hz. An array containing more than one -silencer can achieve a sound transmission loss exceeding 7 dB and a maximum absorption coefficient surpassing 0.5. These outcomes confirm that the compactly designed -silencer effectively mitigates noise across the entire broadband spectrum, providing the foundation for an efficient low-frequency noise-reduction system.

中文翻译：

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增强线圈式元消音器的声衰减：通过彩虹捕获实现宽带低频噪声控制


在这项研究中，我们介绍了一种专为宽带低频声衰减而设计的消音器。它由四个并联谐振器组成，每个谐振器包含一个盘绕的多缝，采用彩虹捕获来实现有效的低频声衰减。弯曲的多个狭缝产生声学黑洞效应，显着有助于低频范围内的降噪。多缝配置末端的空腔进一步降低了低频噪声。彩虹捕获通过在声波群速度达到零的频率处诱发局部共振来实现特定频率的声衰减。线圈结构确保这种情况发生在与特定频率相对应的特定狭缝处，从而改善宽带声衰减；所提议的消音器在 728 Hz 以上的宽带宽上运行。包含多个消音器的阵列可以实现超过7dB的声音传输损失和超过0.5的最大吸收系数。这些结果证实，设计紧凑的消音器可以有效减轻整个宽带频谱的噪声，为高效的低频降噪系统奠定了基础。