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首页> 外文期刊>Composite Structures >A sandwich anechoic coating embedded with a micro-perforated panel in high-viscosity condition for underwater sound absorption
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A sandwich anechoic coating embedded with a micro-perforated panel in high-viscosity condition for underwater sound absorption

机译：在高粘度条件下嵌入微孔板的三明治式消声涂层，可吸收水下声音

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摘要

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.
机译：本文的兴趣在于微孔板（MPP）的水下应用。本文提出了一种新型的基于MPP和粘弹性基底的水下吸声结构。在高粘度蓖麻油条件下的MPP在低频带宽中产生吸收峰，并且适当厚度的橡胶基材在中高频下具有良好的吸收性能。基于波传播方程，弹性体振动方程，MPA的Maa方程和声波的连续性条件，基于传递矩阵法推导了新结构的吸声公式。所提出的模型在充满水的水声阻抗管中进行了测试，与理论结果吻合良好。由于MPP，在类似于15 kHz的1 kHz以上的频率内，吸收系数（α）明显得到改善。可以看出，这样的结构可以在低频范围内主要增强吸收，扩大吸收带宽，并具有用作水下消声涂层的潜力。

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