水下刚性角反射器散射特性

为了分析水下角反射器的声散射特性,提出了一种计算水下凹面目标散射声场的方法。采用ANSYS软件构建水下角反射器实体模型,再利用声学分析软件SYSNOISE对其远场散射声场进行仿真。计算了二面角反射器的目标强度,并与声束弹跳法和板块元法的计算结果进行对比,验证了该方法的适用性和精确性。对三面角反射器的散射特性进行了分析,得到了不同声波入射角度下的目标强度、目标强度随频率的变化规律以及散射方向图,结果表明,正方形角反射器的目标强度最大,三角形角反射器的散射宽度最大,角反射器目标强度不存在明显的频率效应。计算了八面角反射体的方向图,计算结果表明角反射器组合可以有效增大目标强度和散射宽度。

Acoustic scattering characteristics of underwater rigid corner reflector

To analyze the acoustic scattering characteristics of underwater corner reflector, a method to calculate scattering acoustic field of concave target is proposed. According to the boundary element method (BEM), the mathematical model for the scattering acoustic field of underwater target is established. The corner reflector model is established by ANSYS software. Then by using acoustic analysis software SYSNOISES, the scattering acoustic field of corner reflector in far field is simulated. The target strength of biplanar corner reflector is calculated. By contrasting calculation results of the beam shooting and bouncing method and the planar elements method, the applicability and precision of this method is proved. By analyzing the scattering characteristics of three different trihedral corner reflectors, the target strength at different angles of incidence, its variation with frequency and scattering directional diagram are obtained. The results show that the target strength of the square corner reflector is the maximum, the scattering width of triangle corner reflector is the maximum, and no obvious frequency effect appears on the target strength of corner reflector. The scattering directional diagram of octahedral corner reflector is calculated. The results show that the corner reflector combination can increase target strength and scattering width.