We report an ultrathin sound-absorbing panel with a continuous sound absorption greater than 0.7 over a frequency bandwidth of about 600 Hz. The panel is constructed by several different individual absorbers, and each absorber is composed of a perforated plate and a coiled coplanar air chamber with an extended tube inserted at the end of it. The extended tube which is co-planarly coiled in a plane with the chamber divides the end of the chamber into three tubes. By designing the geometric parameters of the three tubes, an absorption coefficient spectrum of the individual absorber with three absorption peaks can be designed, and every absorption peak can be adjusted individually. As the research premise of the broadband sound-absorbing panel, the acoustic absorption coefficient of the individual absorber is first derived through the theoretical method, and the fundamental effects of the structural parameters on the absorption characteristics are also investigated. Besides, the physical absorption mechanism of the absorber is also revealed by numerical simulation. Therefore, by connecting several absorber units with reasonable structural parameters in parallel, a parallel absorbing panel with broadband absorption bandwidth can be designed. To verify the validity of the designed individual absorber and the broadband absorbing panel, samples have been designed and fabricated by 3D printing, and their acoustic characteristics are measured by experimental study.

我们报告了一种超薄吸音板，在大约 600 Hz 的频率带宽内具有大于 0.7 的连续吸声。该面板由几个不同的单独吸收器构成，每个吸收器由一个穿孔板和一个盘绕的共面气室组成，气室的末端插入一根延长管。与腔室共面盘绕在一个平面内的延伸管将腔室的末端分成三个管。通过设计三管的几何参数，可以设计出具有三个吸收峰的单个吸收体的吸收系数谱，每个吸收峰都可以单独调整。作为宽带吸音板的研究前提，首先通过理论方法推导出单个吸声体的吸声系数，并研究了结构参数对吸声特性的基本影响。此外，还通过数值模拟揭示了吸收体的物理吸收机制。因此，通过将多个具有合理结构参数的吸波单元并联，可以设计出具有宽带吸收带宽的并联吸波板。为了验证设计的单个吸波器和宽带吸波板的有效性，通过 3D 打印设计和制造了样品，并通过实验研究测量了它们的声学特性。通过数值模拟还揭示了吸收器的物理吸收机制。因此，通过并联多个结构参数合理的吸波单元，可以设计出具有宽带吸收带宽的并联吸波板。为了验证设计的单个吸波器和宽带吸波板的有效性，通过 3D 打印设计和制造了样品，并通过实验研究测量了它们的声学特性。通过数值模拟还揭示了吸收器的物理吸收机制。因此，通过并联多个结构参数合理的吸波单元，可以设计出具有宽带吸收带宽的并联吸波板。为了验证设计的单个吸波器和宽带吸波板的有效性，通过 3D 打印设计和制造了样品，并通过实验研究测量了它们的声学特性。