Feurtado Philip A, Conlon Stephen C
Applied Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
J Acoust Soc Am. 2017 Sep;142(3):1390. doi: 10.1121/1.5001503.
In recent years acoustic black holes (ABHs) have been developed and demonstrated as an effective method for developing lightweight, high loss structures for noise and vibration control. ABHs employ a local thickness change to tailor the speed and amplitude of flexural bending waves and create concentrated regions of high strain energy which can be effectively dissipated through conventional damping treatments. These regions act as energy sinks which allow for effective broadband vibration absorption with minimal use of applied damping material. This, combined with the reduced mass from the thickness tailoring, results in a treated structure with higher loss and less mass than the original. In this work, the transmission loss (TL) of plates with embedded ABHs was investigated using experimental and numerical methods in order to assess the usefulness of ABH systems for TL applications. The results demonstrated that damped ABH plates offer improved performance compared to a uniform plate despite having less mass. The result will be useful for applying ABHs and ABH systems to practical noise and vibration control problems.
近年来，声学黑洞（ABHs）已得到发展并被证明是一种开发用于噪声和振动控制的轻质、高损耗结构的有效方法。声学黑洞采用局部厚度变化来调整弯曲波的速度和振幅，并产生高应变能的集中区域，这些区域可以通过传统的阻尼处理有效地耗散。这些区域充当能量吸收器，能够以最少的外加阻尼材料实现有效的宽带振动吸收。这与厚度调整导致的质量减轻相结合，使得处理后的结构比原始结构具有更高的损耗和更小的质量。在这项工作中，使用实验和数值方法研究了嵌入声学黑洞的板的传输损耗（TL），以评估声学黑洞系统在传输损耗应用中的实用性。结果表明，尽管质量较小，但阻尼声学黑洞板的性能优于均匀板。该结果将有助于将声学黑洞及声学黑洞系统应用于实际的噪声和振动控制问题。
