水下空腔多格角反射体声散射特性研究

Acoustic scattering characteristics of underwater multicell cavity corner reflectors

针对水下单层薄金属板多格角反射体存在频率特性强烈,难以形成较为稳定目标强度的问题,设计了一种新的空腔多格角反射体。采用结构有限元结合流体直接边界元法,对水下空腔多格角反射体声散射特性进行了仿真计算,在5.0~15.0 kHz入射频率范围内,研究分析了平板厚度、空腔厚度、入射角度等因素对其目标强度的影响机理。结果表明:与薄金属板多格角反射体相比,空腔多格角反射体频率特性较弱,去耦作用明显,散射能力强;空腔多格角反射体在一定角度范围内都能保持稳定的目标强度,具有更优的反射性能,是较为理想的水下声反射装置。

Underwater multicell single-layer thin metal plate corner reflectors can t form a relatively stable TS in a large space because of its strong frequency characteristics.To solve the problem,the paper designs the underwater multicell cavity corner reflectors.Then using FEM coupled DBEM solver to simulated its scattering acoustic field in incident wave frequence varies from 5.0 kHz to 15.0 kHz.The results show that the underwater multicell cavity corner reflectors has weak frequency characteristics,obvious decoupling effect and strong scattering ability.Underwater multicell cavity corner reflectors can maintain stable target strength in a large space,and has better reflection ability,so it is an ideal underwater acoustic reflection device.