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Purpose <p>To address the problems of unstable sound absorption characteristics of acoustic overlay under hydrostatic pressure and ineffective low-frequency sound absorption capacity of underwater vehicle acoustic overlay, a quasi-periodic acoustic black hole rib-ring overlay structure (Q-ABHRRO) is proposed in this work.</p> Methods <p>The structure is based on an acoustic overlay and is designed to resemble an open acoustic black hole cylindrical hollow. Acoustic black hole rib rings are employed as resonant absorbers in the cavity, with evenly spaced rib rings and a power-law distribution of rib ring inner diameters.</p> Results <p>The structure's vibration and noise reduction and low-frequency broadband sound absorption were realized. Meanwhile, it was confirmed that the Q-ABHRRO structure's sound absorption effect was stable under various hydrostatic pressures. Compared with the cylindrical cavity overlay, the Q-ABHRRO structure achieves a peak sound absorption coefficient of 0.71 in the low-frequency band, and the mean-square velocity and far-field sound-radiated power level of the surface of the overlay in contact with the water are significantly reduced.</p> Conclusion <p>The tendency of different parameters to modulate the sound absorption and acoustic radiation characteristics of the Q-ABHRRO structure is clarified, which provides valuable design guidance for the development of acoustic stealth performance for underwater vehicles.</p>

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Acoustic Absorption and Radiation Features of Quasi-Periodic Acoustic Black Hole Rib Rings of Overlays

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Wei Li,
  • Huabing Wen,
  • Junhua Guo

摘要

Purpose

To address the problems of unstable sound absorption characteristics of acoustic overlay under hydrostatic pressure and ineffective low-frequency sound absorption capacity of underwater vehicle acoustic overlay, a quasi-periodic acoustic black hole rib-ring overlay structure (Q-ABHRRO) is proposed in this work.

Methods

The structure is based on an acoustic overlay and is designed to resemble an open acoustic black hole cylindrical hollow. Acoustic black hole rib rings are employed as resonant absorbers in the cavity, with evenly spaced rib rings and a power-law distribution of rib ring inner diameters.

Results

The structure's vibration and noise reduction and low-frequency broadband sound absorption were realized. Meanwhile, it was confirmed that the Q-ABHRRO structure's sound absorption effect was stable under various hydrostatic pressures. Compared with the cylindrical cavity overlay, the Q-ABHRRO structure achieves a peak sound absorption coefficient of 0.71 in the low-frequency band, and the mean-square velocity and far-field sound-radiated power level of the surface of the overlay in contact with the water are significantly reduced.

Conclusion

The tendency of different parameters to modulate the sound absorption and acoustic radiation characteristics of the Q-ABHRRO structure is clarified, which provides valuable design guidance for the development of acoustic stealth performance for underwater vehicles.