Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector

CHU Zi-chao; LUO Yi; WEN Wu-di

doi:10.11993/j.issn.2096-3920.202204012

Volume 30 Issue 6

Dec 2022

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CHU Zi-chao, LUO Yi, WEN Wu-di. Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector[J]. Journal of Unmanned Undersea Systems, 2022, 30(6): 740-746. doi: 10.11993/j.issn.2096-3920.202204012

Citation:

CHU Zi-chao, LUO Yi, WEN Wu-di. Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector[J]. Journal of Unmanned Undersea Systems, 2022, 30(6): 740-746. doi: 10.11993/j.issn.2096-3920.202204012

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Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector

doi: 10.11993/j.issn.2096-3920.202204012

School of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China

Received Date: 2022-04-20
Rev Recd Date: 2022-08-03

Available Online: 2022-11-03

Abstract

Abstract

Underwater corner reflectors have a strong acoustic scattering ability and can be used to mark underwater structures and simulate underwater false targets. In accordance with the limitation of the reflection range of a single-grid corner reflector, a new eight-grid air-filled cavity corner reflector was designed. The acoustic scattering characteristics of the eight-grid air-filled cavity corner reflector and single-grid air-filled cavity corner reflector were simulated and compared using the finite element method-boundary element method. The effect of the eight-grid corner reflector due to multiple grids and the effects of changing the incident angle, frequency of incident wave, and air-filled cavity thickness on the eight-grid air-filled cavity corner reflector scatter sound field were analyzed. The results show that the eight-grid air-filled cavity corner reflector has a larger scattering range and greater target intensity, effectively compensating for the problems of low scattering intensity and reflection blind area of the single-grid air-filled cavity corner reflector. The interaction between multiple grids can effectively increase the scattering width, resulting in the formation of a wide range of scattered sound fields due to structural vibrations. Changing the thickness of the air-filled cavity under different incident sound wave frequencies does not have a significant effect on the target strength.
- underwater corner reflector,
- air-filled cavity,
- target strength,
- acoustic scattering characteristic

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References(14)

References

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