高频辐射噪声近程传播特性研究

Propagation Property of Short Range High-frequency Radiated Noise Con-sidering Sea Surface Scattering Effect

针对近程反鱼雷武器系统建设问题,研究了鱼雷高频辐射噪声的近场传播特性。采用小斜率近似(SSA)方法研究了粗糙海面的声散射特性,给出了具有高斯分布粗糙海面的2阶～4阶SSA双站散射系数计算公式,讨论了2阶SSA双站散射系数随海面粗糙度及入射角度不同的变化规律。并利用SSA双站散射系数计算了水下高频辐射噪声散射声场。仿真结果表明,粗糙海面的散射效应对高频辐射噪声传播产生较大影响,在研究声源/接收器位于近海面的高频辐射噪声传播特性时,应充分考虑海面的散射效应。本文的研究为分析浅海目标声散射特性时,是否需要考虑海面(海底)所引起的多途效应提供了理论依据。

Aiming at the urgent demand of constructing short range anti-torpedo system,we investigate the propagation property of torpedo′s near-field high-frequency radiated noise.We analyze the acoustic scattering properties of rough sea surface using the small slope approximation（SSA）,give the expression of second-order to fourth-order SSA bistatic scattering coefficient for the rough sea surface with Gaussian distribution,and discuss the variation law of second-order SSA bistatic scattering coefficient with different sea surface roughness and incidence angle.The scattering field of un-derwater high-frequency radiated noise is calculated by using the SSA bistatic scattering coefficient.Simulation result shows that the scattering effect of sea surface should be considered in studying the propagation property of high-fre-quency radiated noise with source/receiver near sea surface.