声耦合Fano共振和声学变形
Channel-Coupling Fano Resonance and Acoustic Metadamping
摘要：
Fano共振是由局域共振和背景连续谱的干涉引起的，具有不对称的光谱轮廓。它的窄带性质似乎不利于宽带噪声消除的目的。在这项研究中，我们在理论上报告了一个有趣的声学超材料能够产生多个Fano样的共振，实现宽带声屏障具有令人满意的传输损耗性能。我们提出的设计包括一个有效的通道，其特征在于有效的参数和短通道充满空气。有效通道支持单极和偶极模式，它们与短通道所允许的连续态相互作用，产生一对Fano共振。由于声波的相消干涉，这两种谐振导致在0.6-1.1 kHz的宽范围内传输损耗总体超过10 dB。为了进一步优化整体性能，我们引入metadamping通过整合额外的粘性泡沫在拟议的晶胞。此外，对于未来的实验测试，阻尼设计被解码成一个真正的空间线圈单元，其表现出相同的功能，并组装成一个隔墙，以确保在0.32-4 Hz的范围内传输损耗超过10 dB。最后，声学负折射可以通过以类似的方式部署两个耦合的空间螺旋通道来实现。我们相信这项工作为实现有效的宽带隔音设备和有效的通风铺平了道路。
英文摘要：
Fano resonance featuring asymmetric spectral profiles originates from the interference of local resonances and background continuum. Its narrow-band nature looks seemingly adverse to broadband noise cancellation purposes. In this study, we report theoretically on an intriguing acoustic metamaterial capable of generating multiple Fano-like resonances to realize a broadband sound barrier with satisfactory transmission loss performance. Our proposed design involves an effective channel characterized by effective parameters and short channels filled with air. The effective channel support both monopolar and dipolar modes which interact with the continuum state admitted by the short channels to generate a pair of Fano-like resonances. Due to the destructive interference of sound waves, the two resonances result in transmission loss overall exceeding 10 dB over a broad range 0.6-1.1 kHz. In order to further optimize the overall performance, we introduce metadamping by integrating additional viscous foams in the proposed unit cell. Furthermore, for future experimental tests, the dampened design is decoded into a real space-coiling cell which exhibits identical functionality and is assembled into a partition wall to ensure transmission loss over 10 dB across the range 0.32-4 Hz. Lastly, acoustic negative refraction is accessible by deploying two coupled space-coiling channels in a similar fashion. We believe this work paves the way for realizing effective broadband sound insulation devices with efficient ventilation.
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