一种并联式低频宽带截断声波黑洞吸声结构

Low-frequency broadband sound absorption in a parallel truncated-tail sonic black hole

  • 摘要: 低频声波衰减及耗散是制约水下航行器应用及发展的关键因素之一,声波黑洞作为一种特殊的声学超材料,具有捕获和耗散声波的巨大潜力。设计了一款并联式截断声波黑洞,通过并联不同构型的截断声波黑洞,利用声波黑洞之间的耦合效应,实现了低频宽带吸声。首先,采用有效介质法计算了结构的有效参数及吸声系数,并采用有限元法验证了有效介质法的准确性。通过参数扫描计算各结构参数对吸声性能的影响,采用阻抗管法对结构吸声性能进行了验证。结果表明:将多个截断声波黑洞模型并联可以有效提升材料整体的吸声性能,与单个截断声波黑洞模型相比,将多个截断声波黑洞并联,材料的平均吸声系数可提高接近2倍。

     

    Abstract: Low-frequency sound wave attenuation and dissipation are critical factors that limit the application and development of underwater vehicles. Acoustic black holes, as a special type of acoustic metamaterial, possess significant potential for capturing and dissipating sound waves. In this study, a parallel configuration of truncated acoustic black holes (TSBH) is designed, where multiple TSBH units with different configurations are coupled together. This coupling effect allows for broadband low-frequency sound absorption. Initially, the effective medium theory is employed to calculate the effective parameters and sound absorption coefficient of the structure, and the finite element method is used to verify the accuracy of the effective medium theory. A parameter scan is conducted to assess the impact of various structural parameters on sound absorption performance. Additionally, impedance tube testing is performed to validate the sound absorption performance of the structure. The results show that paralleling multiple TSBH models effectively enhances the overall sound absorption performance of the material. Compared to a single TSBH model, the average sound absorption coefficient of the material can nearly double when multiple TSBH units are arranged in parallel.

     

/

返回文章
返回