基于声散射模型的鱼雷自噪声特性分析及仿真预报

Characteristic Analysis and Prediction Simulation of Torpedo Self-Noise Based on Acoustic Scattering Model

针对水下高速航行时鱼雷的主要自噪声源——螺旋桨噪声,分析了其通过散射传播形成的自噪声,以水下声散射理论为依据,在忽略雷长情况下建立了简化的自噪声场物理模型,计算了自噪声平均强度级,分析了鱼雷辐射噪声级(螺旋桨噪声形成的辐射噪声)、声吸收系数、散射系数、航深等参数对自噪声的影响。仿真结果表明,变化规律与经验数据吻合,证明了该模型的正确性和有效性。

Propeller noise forms the main self-noise source of a torpedo running at high speed under water by scattering propagation. According to the underwater acoustic scattering theory, a simplified self-noise field physical model is con- structed by ignoring torpedo length to calculate the average intensity level of self-noise and analyze the influences of the parameters, such as the radiated noise level from torpedo propeller, the sound absorption coefficient, the scattering co- efficient, and the running depth, on the self-noise. Simulation results coincide with the empirical data, indicating the validity and effectiveness of this model.