论文部分内容阅读
研究海洋环境噪声场中声压和质点振速的三个正交分量间的空间相干。假定海洋介质水平分层,非相关偶极子噪声源均匀分布于海面,由射线声学理论出发,导出了计算噪声场中声压和质点振速的空间相干矩阵的积分表示式。积分式中的被积函数包含一噪声强度垂直指向性因子,海洋介质分层条件通过该指向性因子影响噪声场的空间相干。针对浅海和均匀半空间环境,给出了相应的空间相干计算结果,发现海洋水文和海底对噪声场中声压和质点振速空间相干的影响不可忽略。
The spatial coherence between the three orthogonal components of the sound pressure and the particle velocity in a marine environment noise field is studied. Based on the theory of ray acoustics, assuming that the horizontal distribution of the ocean medium is stratified and the non-correlated dipole noise sources are uniformly distributed on the sea surface, the integral expression of the spatial coherence matrix for calculating the sound pressure and particle velocity in the noise field is deduced. The integrand in the integrand contains a vertical directivity factor of noise intensity, and the stratification condition of the ocean medium influences the spatial coherence of the noise field through the directivity factor. For shallow sea and even half-space environment, the corresponding spatial coherent computing results are given. It is found that the influence of ocean hydrology and seabed on the spatial coherence of sound pressure and particle velocity in noise field can not be neglected.