Acoustic Reflection Characteristics and Strength Enhancement Method of Underwater Multigrid Elastic Corner Reflector

doi:10.12382/bgxb.2023.0012

Abstract

Abstract:

Single grid corner reflector can only reflect the incident wave in a certain direction. In order to reflect the incident acoustic waves in different directions, it is necessary to construct a multigrid corner reflector and study its acoustic reflection characteristics. Taking the different types of eight-grid corner reflectors as the research object, the scattering acoustics field of underwater multigrid corner reflectors is simulated based on the structure finite element coupled indirect boundary element method. The acoustic reflection performance of different types of multigrid corner reflectors under the condition of different frequencies, materials, thicknesses, and incident angles is analyzed. A method to improve its acoustic reflection ability is proposed from the perspective of convenient engineering application. The consistency between the simulation data and the experimental data is verified through the experiment in a pool under typical conditions. The results show that the target strength of underwater multigrid elastic corner reflector increases with the increase in the incident frequency and tends to be stable; the target strength fluctuates greatly with the change of incident angle, and the target strength values of different types of corner reflectors are greatly different; target strength increases with the increase of plate thickness, but not significantly; the target strength increases obviously with the increase in the side length; and the acoustics reflection performance of multigrid corner reflector made of soft material is better than that of metal corner reflector. Therefore, in order to enhance the acoustic reflection ability of underwater multigrid corner reflector, it is more effective to increase the side length of reflector and select low impedance material.

Key words: underwater multigrid corner reflector, elastic, acoustic reflection, enhancement method

CLC Number:

TJ67

LUO Yi, ZHANG Jingzhuo, CHU Zichao, WU Haoran. Acoustic Reflection Characteristics and Strength Enhancement Method of Underwater Multigrid Elastic Corner Reflector[J]. Acta Armamentarii, 2024, 45(6): 2025-2033.

Figures/Tables 15

Fig.1 Eight-grid corner reflector models

Fig.2 Schematic diagram of acoustic wave incidence

Fig.3 Target strength curve of eight-grid triangular corner reflector(θ=90°,φ=0°-90°)

Fig.4 Target strength curve of eight-grid circular corner reflector (θ=90°,φ=0°-90°)

Fig.5 Target strength curve of eight-grid square corner reflector(θ=90°,φ=0°-90°)

Fig.6 Comparison of target strengths of multigrid corner reflectors with different plate thicknesses

Fig.7 Structural diagram of corner reflector plate

Fig.8 Comparison of target strengths of multigrid corner reflectors made of different materials

Fig.9 Comparison of target strengths of multigrid corner reflectors with different side lengths

Fig.10 Comparison of target strengths of 3 corner reflectors with different shapes

Fig.11 Eight-grid corner reflectors

Fig.12 Experimental layout

Fig.13 Site of experimental layout

Fig.14 Comparison of simulated and experimental results of eight-grid steel plate circular corner reflector

Fig.15 Comparison of simulated and experimental results of eight-grid air-layer triangular corner reflector

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