声场计算模型的环境宽容性分析

浅海水声环境容易受到各种因素的影响,导致其环境参数具有很强的不确定性,依据环境宽容性选择快速、精确的声场计算模型是保证后续研究分析正确性的重要前提。以海水声速为例,简述了基于传播损失和声场互相关系数的计算模型环境宽容性分析方法。为定量描述环境和声场计算模型的失配情况,在研究浅海不确定环境对于声场空间相关性影响的基础上,结合水声环境不确定性推理模型,得到声场空间相关半径和传播损失概率分布可信区间,提出利用声场空间相关半径相对值来度量声场计算模型的环境宽容性,同时利用非嵌入式随机多项式展开(NON-Polynomial Chaos Expansion, NPCE)法,结合差值评定方法对得到的环境宽容区间进行验证,结果表明,利用声场相关半径相对值可以定量分析不确定性环境下声场计算模型的宽容性。

Analysis of the environment robustness of acoustic field calculation model

The acoustic environment in shallow water is easily affected by various factors, resulting in a strong uncertainty of its environment parameters. Selecting a fast and accurate acoustic field calculation model based on environment robustness is an important prerequisite to ensure the correctness of subsequent research and analysis. Taking the sound speed of water as an example, the environment robustness analysis method based on propagation loss and acoustic field correlation coefficient is described briefly. In order to quantitatively describe the mismatch between environment and acoustic field calculation model, the influence of uncertain environment parameters on the spatial correlation of sound field in shallow sea is studied. Based on the inference model of underwater acoustic environment uncertainty, the confidence interval of spatial correlation radius and the propagation loss probability distribution of the acoustic field are obtained. The relative value of spatial correlation radius of the acoustic field is proposed to measure the environment tolerance of the acoustic field calculation model, and the NON-Polynomial Chaos Expansion (NPCE) method combined with the difference evaluation method is used to verify the environment-robust interval. The results show that the relative value of spatial correlation radius of the acoustic field can be used to quantitatively analyze the robustness of the acoustic field calculation model in uncertain environments.