摘要
水下声场是海洋环境参数的非线性函数,因此环境参数的不确定性必然会引起水下声场预测的不确定性,从而导致与声场预测相关的声呐探测和水声通信等设备性能的下降。该文将Sobol敏感度指数的计算与多项式混沌展开方法相结合,将敏感度指数表达为环境条件的函数,利用Q范数约束的双曲截断方案来减少多项式项数,有效地分析了设定的“浅海负梯度温跃层”信道中8个环境参数及其交互效应对水下声传播的影响。结果表明,沉积层声速是低频远距离声场不确定性分布的最主要贡献参数,同时对于下发下收的情况,声源深度的影响程度随着声源频率增加而逐渐增大。最后应用射线理论从海底反射的角度解释了各个环境因素影响程度差异的具体原因。该文的研究对水声通信和探测系统在浅海不确定环境下的性能预报研究具有重要的参考意义。
Underwater sound field is a function of ocean environmental parameters.Therefore,the uncertainty of environmental parameters will inevitably cause the uncertainty of sound field prediction,which will lead to the degradation of underwater acoustic communication and detection performance.In this paper,the calculation of the Sobol sensitivity index is combined with the polynomial chaos expansion method to calculate the influence of 8 environmental parameters in the set“shallow sea negative gradient thermocline”channel on sound field propagation.The results show that the sedimentary sound speed is the most important parameter contributing to the uncertain distribution of low frequency and long range sound field.At the same time,the influence of sound source depth gradually increases with the increase of source frequency.We use the ray theory to explain the specific reasons for the difference in the degree of influence of various environmental factors.Numerical simulation results verify the effectiveness of the method used in this paper.The research results are important for the prediction of underwater acoustic communication and detection system in the shallow water with uncertain environment.
作者
张鹏
吴立新
胡治国
张雪冬
ZHANG Peng;WU Lixin;HU Zhiguo;ZHANG Xuedong(State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《应用声学》
CSCD
北大核心
2021年第3期422-432,共11页
Journal of Applied Acoustics
基金
国家自然科学基金项目(11774374)。
关键词
不确定性传播
环境敏感度分析
多项式混沌展开
传播损失
Uncertainty propagation
Sensitivity analysis
Polynomial chaos expansion
Transmission loss
