基于板块元的水面舰船远场声目标强度预报方法

A method for predicting far-field target strength of surface ship based on planar elements theory

提出了一种基于板块元的水面舰船水下远场声目标强度数值预报方法,首先根据水面舰船水下船体及附体的型线进行等效建模,采用板块元方法进行网格划分,建立了水面舰船特有的复杂附体二次反射、海面散射效应的数值模型,将各板块元的声散射视为一种"滤波",各板块元的散射声传输函数具有不同幅度、相位、时延,将其叠加之和进行反傅氏变换后,获得水面舰船波形级的远场声目标强度及方位分布特征。通过分析比较典型声呐探测信号下水面舰船的声目标强度,验证了该方法的有效性,为优化与控制水面舰船目标强度,分析水面舰艇水声对抗的作战效能提供了物理依据。

A far-field target strength（TS） predicting method of surface ship based on planar elements theory is proposed. First, the equivalent 3D models of the underwater hull and appendages are prepared according to the designed form, and then partitioned to mesh by using planar element theory, then the numerical models of the surface scattering and secondary scattering between appendages are established, and the scattering signal of each planar element is described as a transfer function including amplitude, phase and time delay; finally the far-field TS of surface ship in wave level and its distribution characteristics are achieved by inverse Fourier transforming the plus of the transfer function of each planar element. The availability of the present method is verified via comparing TS of surface ship in different incident directions. As a result, a reliable predicting method for optimizing and controlling the TS of surface ship and for analyzing the operational efficiency of underwater acoustic countermeasure of surface ship is provided.