噪声源非均匀分布海洋环境噪声水平声能流理论分析

研究水平非均匀分布噪声源所产生的各向异性海洋环境噪声场声能流。提出一种混合型非均匀分布噪声源模型,理论分析并数值计算了此模型情况下的环境噪声场水平声能流。结果表明:非均匀分布噪声源引起的海洋环境噪声场具有显著非零平均水平声能流;不同接收点的水平声能流明显不同;其幅度和方向取决于各个局部海域不等强度声源产生的合成噪声声能流矢量和。研究了两接收点间噪声的声压和振速水平分量、振速水平分量归一化相关系数随两接收点间距的关系,各量之间表现出较强相关性,为分析水下矢量声场目标探测技术性能提供理论依据。 

Theoretical analysis of acoustic energy flux of ocean ambient noise caused by non-uniform distributed noise sources

Acoustic energy flux of anisotropic ocean ambient noise is studied,which is caused by horizontally nonuniform distributed noise sources.A mixed model of non-uniform distributed noise sources is established.Acoustic energy flux of anisotropic ocean ambient noise is analyzed and calculated based on this noise model.The numerical results show that the ambient noise field caused by non-uniform distributed noise sources has obvious nonzero horizontal acoustic energy flux;the acoustic energy flux varies distinctively at different receiver position;its magnitude and direction depend on the synthetic effects of the different parts of noise sources.The changes of the normalized correlation coefficients with the receiver distance between the pressure and horizontal particle velocity at two different receivers,and horizontal particle velocities at two different receivers have been studied,with high correlation coefficients,which provides theoretical basis for analyzing the performance of target detection technology using underwater vector field.