基于双基地模型的鱼雷自噪声仿真预报

Theoretical analysis and simulation prediction of torpedo self-noise based on acoustic scattering model

鱼雷自噪声直接影响了自导系统的有效探测距离和定向精度,而在水下航行时螺旋桨辐射噪声是其自噪声的主要声源。本文针对螺旋桨噪声在海洋中经散射产生的自噪声,提出了一种基于声散射模型的理论研究方法,推导自噪声平均强度。仿真分析体积、海面散射及鱼雷散射自噪声强度随螺旋桨噪声形成的辐射噪声、声吸收系数、散射系数、航深等参数的变化关系。考虑雷长,分析其影响,建立精确的理论模型。仿真结果表明,变化规律与客观事实和经验数据吻合,表明了该模型的正确性和有效性,为鱼雷自噪声预报提供了新的途径。

Torpedo self-noise affects the detection range and localization accuracy of its homing system. While propeller noise occupies the dominating position in the condition of high frequency and high speed,it is essential to study on propeller noise. So this paper proposes a method focused on it. It is based on bistatic scattering model comparatively. And it analyses variational rules of parameters for torpedo self-noise by using Matlab,such as the radiated noise, the sound absorption coefficient, the scattering coefficient and the depth. It also analyses the effect of torpedo length. Simulation results show that the effects obtained by analyzing the computing results conform to the objective law. It indicates the validity of this theoretical model. Also it finds a new way to predict torpedo self-noise exactly and effectively.