含覆层圆柱空腔的声学材料水下吸声特性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (14) : 103-111.

论文

含覆层圆柱空腔的声学材料水下吸声特性研究

王世博1,2,3，胡博1,2,3，张昊阳1,2,3，陈骋1,2,3，陈峰1,2,3

作者信息 +

Underwater sound absorption of an acoustic material embedded with coated cylindrical cavities

WANG Shibo1,2,3，HU Bo1,2,3，ZHANG Haoyang1,2,3，CHEN Cheng1,2,3，CHEN Feng1,2,3

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文章历史 +

摘要

针对增加水下空腔谐振型声学材料的孔隙率导致吸声系数下降的问题，在声学材料的圆柱空腔外包覆多层覆层结构，提出了含覆层圆柱空腔的声学材料。采用有限元方法计算了声学材料的吸声系数，相比含圆柱空腔的声学材料，覆层圆柱空腔使声学材料具有更低的吸声频带和更高的吸声能力。通过计算单极共振频率揭示吸声机理，覆层圆柱空腔比圆柱空腔具有更低的单极共振频率，使声学材料的频带更低。功耗密度场分布结果表明，多层覆层结构提供了更多的交界面，声波的散射增强从而声能损耗加剧。研究了多层覆层结构的模量和厚度分布形式对吸声性能的影响，模量呈正梯度变化与厚度呈负梯度变化的多层覆层结构分布形式能够使吸声覆盖层获得较好的低频吸声性能。

Abstract

To solve the reduction of the sound absorption coefficient due to the increase of the porosity of the cavities embedded in anechoic coatings, an acoustic material embedded with coated cylindrical cavities is proposed in this paper, where the cylindrical cavities are covered with multiple coating layers. The sound absorption performance of the proposed acoustic material is calculated by finite element method. Compared with the acoustic material only with cylindrical cavities, the proposed one has a lower sound absorption range and higher absorption capacity. The absorption mechanism is revealed by investigating monopole resonance frequency. The monopole resonance frequency of a coated cylindrical cavity is lower than that of a cylindrical cavity, leading to a lower sound absorption frequency range. The result of the power density distribution shows that the multiple coating layers provide more interfaces, and the scattering of sound waves is enhanced. As a result, the sound energy loss is enhanced. The influences of the modulus and thickness distribution on the sound absorption performance of the multiple coating layers is studied. The positive gradient change of the modulus and negative gradient change of the thickness for the multiple coating layers can make the sound absorption performance better.

导出引用

王世博1, 2, 3, 胡博1, 2, 3, 张昊阳1, 2, 3, 陈骋1, 2, 3, 陈峰1, 2, 3. 含覆层圆柱空腔的声学材料水下吸声特性研究[J]. 振动与冲击, 2024, 43(14): 103-111

WANG Shibo1, 2, 3, HU Bo1, 2, 3, ZHANG Haoyang1, 2, 3, CHEN Cheng1, 2, 3, CHEN Feng1, 2, 3. Underwater sound absorption of an acoustic material embedded with coated cylindrical cavities[J]. Journal of Vibration and Shock, 2024, 43(14): 103-111

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