水下双层加肋圆柱壳全空间收发分置散射声场快速预报方法

Fast prediction method of full-space bistatic scattering sound field of underwater stiffened double cylindrical shell

针对水下双层加肋圆柱壳的全空间收发分置散射声场求解,提出了一种快速预报方法。该方法将散射声场表示为声散射传递函数与声源密度函数的乘积,以目标表面网格信息、少量的仿真或测试多基地散射声压数据作为已知信息,借助数值积分、矩阵理论、最小二乘法对其他收发分置散射声场进行预报。分别以有限元仿真和试验测试的散射声压数据作为输入,对水下双层加肋圆柱壳的多基地散射声场进行了计算,并与完全采用有限元方法的计算结果进行了对比。结果表明:该方法在目标表面结构和部分散射声场数据已知条件下能对目标的全空间收发分置散射声场进行预报;已知散射声压数据量越多,计算频率越低,预报精度越高。

A fast prediction method is presented for the full-space bistatic scattering sound field of the underwater stiffened double cylindrical shell.The scattering sound field is represented as the product of the acoustic scattering transfer function and the sound source density function.The target surface grid information and a small amount of simulation or experimentation multistatic scattering sound pressure data are used as known information to forecast other bistatic scattering sound fields with the help of numerical integration,matrix theory,and least squares method.The scattered sound pressure data from simulation of the finite element method(FEM)and experimental tests are used as input to calculate the multistatic scattered sound field of the underwater stiffened double cylindrical shell,respectively.The calculated results are compared with those calculated exclusively by the FEM,and the effects of different input data and calculation frequencies on the calculation results are discussed.The results show that the proposed method can predict the full-space bistatic scattered sound field of the target when the surface structure and part of the scattered sound field data are known.The greater amount of known scattered sound pressure data and lower computational frequency lead to higher prediction accuracy.