Acoustic Scattering Characteristics of Underwater Air-filled Cavity Corner Reflector

doi:10.3969/j.issn.1000-1093.2019.10.019

Abstract

Abstract: In accordance with the weakness of low target strength and obvious frequency characteristics of underwater elastic metal plate corner reflectors, a new air-filled cavity elastic corner reflector is designed. The scattering acoustic fields of underwater air-filled cavity corner reflector and single layer metal sheet corner reflector are simulated and compared by using the structural finite element coupled fluid boundary element method (IBEM). The influences of thickness and incident angle on the target strengths and scattering mechanisms of different corner reflectors within 5-15 kHz frequency of incident wave are analyzed and verified through experiment. The research results show that the air-filled cavity corner reflector has great scattering intensity and no obvious frequency characteristics, and the decoupling effect is obvious. The simulated results are in basic agreement with the experimental results. Compared with the cumbersome single layer metal corner reflector with weak reflection intensity, the air-filled cavity corner reflector has better acoustic reflection performance and lighter weight, and is an ideal underwater acoustic reflection device. Key

Key words: cornerreflector, metalplate, underwaterair-filledcavity, acousticscatteringcharacteristic, targetstrength, finiteelement

CLC Number:

TB566

LUO Yi， CHEN Xin. Acoustic Scattering Characteristics of Underwater Air-filled Cavity Corner Reflector[J]. Acta Armamentarii, 2019, 40(10): 2129-2135.

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