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

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 103-111.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (14) : 103-111.

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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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.

Key words

low-frequency sound absorption performance / anechoic coating;cylindrical cavity / multiple coating layers / parameters with gradient changes

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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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