Acoustic Scattering Regulation Mechanism of Underwater Metasurface Corner Reflector

doi:10.12382/bgxb.2022.0566

Abstract

Abstract:

Corner reflector is a common deception method for radar and sonar targets. To enhance the regulation effect of the scattering sound field of conventional concave angles, the regulation method and calculation method of inlaid acoustic metasurfaces in the underwater corner reflector are proposed. Based on the plate element method and the ray tracing algorithm, the acoustic scattering prediction model of the corner reflector with acoustic metasurface configuration is established. Ray tracing is used to determine the position of the sound ray, and the corresponding phase jump is corrected, which is verified by finite element simulation. Based on the established acoustic scattering prediction model, the regulation effect of the gradient and periodic structure of the groove array on the scattering sound field is studied. It is found that: the acoustic metasurface structure with gradient change can significantly change the acoustic scattering characteristics of underwater targets;the combined positive and negative gradient groove array structure has obvious effect on the main direction of acoustic scattering;the gradient structure of multi-period combined groove array is more effective than the single-period structure in scattering sound field regulation.

Key words: metasurface, corner reflector, acoustic scattering, sound field regulation, ray tracing

CLC Number:

TB566

LIU Yan, PENG Zilong, DU Jiaman, KONG Huimin, FAN Jun. Acoustic Scattering Regulation Mechanism of Underwater Metasurface Corner Reflector[J]. Acta Armamentarii, 2023, 44(10): 3146-3155.

Figures/Tables 12

Fig.1 Schematic diagram of one-dimensional metasurface scattering sound field computation model

Fig.2 Schematic diagram of Kirchhoff approximation theory derivation

Fig.3 Diagram of secondary scattering between discrete plates

Fig.4 Schematic diagram of the primary reflection of acoustic waves at the dihedral corner of the acoustic metasurface

Fig.5 Schematic diagram of the secondary reflection of sound wave at the dihedral corner of acoustic metasurface

Fig.6 Determination of virtual source position in secondary scattering

Fig.7 Diagram of secondary scattering of groove in acoustic metasurface

Fig.8 Schematic of acoustic metasurface dihedral corner design

Fig.9 Computational results of dihedral angle scattering sound field on acoustic metasurface

Fig.10 Groove array model with different gradients and computational results of target strength

Fig.11 Groove array model with combined gradients and computational results of target strength

Fig.12 Groove array model of two-period combined gradients and computational results of target strength

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