Abstract This study proposes a promising design of sound absorption panels containing acoustic resonators. Each resonator is comprised of one small-sized and one large-sized tubes in series. The former can be viewed as the neck of a Helmholtz resonator, while the latter serves as a resonant chamber. Both tubes are bent up to fit in limited space of the panel. The 3D printing technology is exploited to fabricate samples for measurements. Frequency manipulation for the absorption peak can be achieved by adjusting the geometric parameters of tubes. Moreover, two pairs of resonators with different dimensions can broaden the bandwidth of absorption. Theoretical predictions on absorption characteristics agree well with numerical and experimental results. The proposed structure offers a feasible way of absorbing low-frequency sound without the need to use thick panels.

中文翻译：

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包含螺旋亥姆霍兹谐振器的吸声板

摘要 本研究提出了一种包含声学谐振器的吸声板的有前途的设计。每个谐振器由串联的一根小型管和一根大型管组成。前者可以看作是亥姆霍兹谐振器的颈部，而后者则是一个谐振腔。两根管子都向上弯曲以适合面板的有限空间。利用 3D 打印技术制造用于测量的样品。可以通过调整管的几何参数来实现对吸收峰的频率控制。此外，两对不同尺寸的谐振器可以拓宽吸收带宽。吸收特性的理论预测与数值和实验结果非常吻合。