A sandwich anechoic coating embedded with a micro-perforated panel in high-viscosity condition for underwater sound absorption
A sandwich anechoic coating embedded with a micro-perforated panel in high-viscosity condition for underwater sound absorption
复制标题
嵌入微孔板的夹层消声涂料，在高粘度条件下用于水下吸声
DOI：
10.1016/j.compstruct.2019.111761
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发表时间：
2020-03-01
影响因子：
6.3
通讯作者：
Li, Shande
中科院分区：
文献类型：
--
作者：
Li, Lin;Zhang, Zhifu;Li, Shande
本文主要研究微穿孔板在水下的应用。本文提出了一种基于MPP和粘弹性基片的新型水下吸声结构。高粘度蓖麻油条件下的MPP在低频带宽内产生吸收峰，适当厚度的橡胶基底在中高频处具有较好的吸收性能。基于波传播方程、弹性体振动方程、Maa MPP方程和声波连续性条件，采用传递矩阵法推导了该结构的吸声公式。在充水的水声阻抗管中对该模型进行了测试，结果与理论计算结果吻合较好。由于MPP，吸收系数（α）在高于1kHz的频率内明显改善，类似于15kHz。结果表明，这种结构可以显著增强低频吸收，拓宽吸收带宽，具有作为水下消声涂层的潜力。
The interest of this article lies in the underwater application of micro-perforated panel (MPP). In this paper, a new type of sound absorption structure based on MPP and viscoelastic substrate for underwater usage is proposed. The MPP in the condition of high-viscosity castor oil generates absorption peak in low-frequency bandwidth, and the rubber substrate of appropriate thickness achieves good absorption performance in medium-high frequency. The sound absorption formula for the new structure is derived from the transfer matrix method based on wave propagation equation, the equation for elastomer vibration, Maa's equation for MPP and continuity conditions for sound waves. The proposed model is tested in a hydroacoustic impedance tube filled with water, which shows good agreement with theoretical results. The absorption coefficient (alpha) is clearly improved within the frequency above 1 kHz similar to 15 kHz due to MPP. It can be seen that such structures can enhance the absorption dominantly in the low-frequency range, broaden the absorption bandwidth, and have the potential to be utilized as an underwater anechoic coating.