基于波数积分的水声传播建模实现方法研究

研究了基于波数积分的水声传播建模数值实现方法,利用局部系数矩阵的映射,建立了全局系数矩阵,分析了保持数值稳定性的方法。用FFP方法实现了数值积分,并讨论了实现过程中的一些细节。结合仿真实例与基于简正波的模型KrakenC和Kraken的计算结果进行了比较分析。结果表明,波数积分方法在近场计算时更为准确,同时还具有容易扩展到复数域计算衰减的问题、容易求解粘弹性介质中声场的特点。

An approach to underwater acoustic propagation modeling based on wave-number integration technique

A study of the numerical realization of underwater acoustic propagation model- ing is made based on wave-number integration.The global coefficient matrix is set up through the mapping of local coefficient matrixes.Measures to maintain the numerical sta- bility are studied.FFP technique is used for the numerical evaluation of the integral with some details.The transmission loss calculated by this method is compared with those given by KrakenC and Kranken based on normal mode theory with an example.It shows that the results given by wave-number integration are more accurate.At the same time,this method is easy to extend to calculate attenuation in complex domain,and can be used to calculate Transmission loss in elastic mediums too.