【摘要】 应用抛物方程(PE)方法,对选定内波和覆盖舰船辐射噪声谱范围的不同声源频率所形成的水声场,用差分步进的方法进行了计算.采用了复变量、带状矩阵、在声源所处的断面利用Gaussian源的表达式和对网格大小的分析,使计算顺利进行.结果表明,内波的存在降低了声场强度,增大传输损失,因此内波对舰船辐射噪声的识别具有不可忽略的影响.更多还原

【Abstract】 Based on parabolic equation(PE) method , the calculation for a selected ocean internal wave and underwater acoustic field is made by the split-step difference algorithm in this paper. The acoustic fie ld is formed by sound source with different frequency covering on the range of r adiation noise of ships and submarines. Owing to the adoption of complex variabl e, sparse matrix, Gaussian source and analysis on the grid size, the results are achieved smoothly. The results show that the influence of internal wave on unde rwater sound can′t be neglected, especially for the component of high frequency . So it′s necessary to take internal wave into account for the identification o f radiation noise of ships and submarines, namely for sound intensity, transmiss ion loss and spectra shape.更多还原