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<p>In this paper, the underwater sound absorption performance of impedance-matched materials was studied by investigating the impact of integrating cylindrical air cavities and metallic oscillators. Four common viscoelastic materials used in underwater acoustic absorber design styrene butadiene rubber (SBR), chlorinated polyethylene rubber, thermoplastic polyurethane, and epoxy were selected as the substrate materials. COMSOL was utilized to conduct finite element simulations to examine the sound absorption coefficient in the range of 1–10&#xa0;kHz. The numerical results were verified by comparing them to existing theoretical and simulation studies. The geometric parameters of the internal components, including the radius, height, and embedding depth of the air cavities and metallic oscillators, were varied to perform a comprehensive parametric analysis. The results showed that the presence of an air cavity significantly enhances the absorption coefficient in the frequency range below 1500&#xa0;Hz by increasing structural compliance and facilitating deeper penetration of sound waves. The metallic oscillator improves absorption in the 1500–4000&#xa0;Hz range and especially above 4000&#xa0;Hz by inducing local resonances and promoting mode conversion into shear waves. The highest overall absorption performance was achieved by SBR among the tested materials, reaching values exceeding 90% across a wide frequency spectrum. The absorption of epoxy was initially limited, but it improved significantly when both resonant elements were incorporated. These findings provide a tunable design strategy for broadband underwater sound-absorbing structures, enabling effective absorption from 400&#xa0;Hz to 10&#xa0;kHz through optimization of internal geometrical features.</p>

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Numerical investigation of the effect of air cavities and metal oscillators on the absorption coefficient of impedance matching materials in the underwater environment

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • A. H. Moradi,
  • A. Hasani Baferani

摘要

In this paper, the underwater sound absorption performance of impedance-matched materials was studied by investigating the impact of integrating cylindrical air cavities and metallic oscillators. Four common viscoelastic materials used in underwater acoustic absorber design styrene butadiene rubber (SBR), chlorinated polyethylene rubber, thermoplastic polyurethane, and epoxy were selected as the substrate materials. COMSOL was utilized to conduct finite element simulations to examine the sound absorption coefficient in the range of 1–10 kHz. The numerical results were verified by comparing them to existing theoretical and simulation studies. The geometric parameters of the internal components, including the radius, height, and embedding depth of the air cavities and metallic oscillators, were varied to perform a comprehensive parametric analysis. The results showed that the presence of an air cavity significantly enhances the absorption coefficient in the frequency range below 1500 Hz by increasing structural compliance and facilitating deeper penetration of sound waves. The metallic oscillator improves absorption in the 1500–4000 Hz range and especially above 4000 Hz by inducing local resonances and promoting mode conversion into shear waves. The highest overall absorption performance was achieved by SBR among the tested materials, reaching values exceeding 90% across a wide frequency spectrum. The absorption of epoxy was initially limited, but it improved significantly when both resonant elements were incorporated. These findings provide a tunable design strategy for broadband underwater sound-absorbing structures, enabling effective absorption from 400 Hz to 10 kHz through optimization of internal geometrical features.