基于LMS VirtualLab的刚性球散射计算

Rigid Spherical Acoustic Scattering Simulation Based on LMS VirtualLab

针对水下目标声散射仿真计算问题,对刚性球体在平面声波作用下的散射声场进行仿真计算。采用直接边界元方法计算刚性球体在不同ka值下的指向性函数,并与理论解析解进行对比。结果表明,不同ka值对应的球体散射声场及其指向性具有明显差异,随着ka值增大,指向性更加明显,前向散射强度越大;球体散射声场计算时,需满足远场条件才能与解析解计算结果较好吻合,当计算点处输出声压数值较小时,提高Virtual.Lab Acoustics声学模块参数设置中默认声压输出精度,可导出满足需求的计算结果,因此,边界元法可用于实际水下目标声散射特性预报。

Aiming at the calculation problem of underwater target sound scattering, this paper simulates the scattered sound field of a rigid sphere under the plane sound wave. Boundary element method is used to calculate the directivity function of rigid sphere under different ka values, and compare with the theoretical analytical solution. The results show that the spherical scattering sound field and its directivity corresponding to different ka values have obvious differences. As the ka value increases, the directivity becomes more obvious, and the forward scattering intensity increases. The solution calculation results are in good agreement. When the output sound pressure value at the calculation point is small, the default sound pressure output accuracy in the parameter settings of the Virtual.Lab Acoustics module is improved. Export calculation results that meet the needs. Boundary element method can be used to predict the acoustic scattering characteristics of actual underwater target.