程广利,张明敏.少量声速剖面时浅海声传播不确定性研究[J].声学技术,2013,32(1):7~10 |
少量声速剖面时浅海声传播不确定性研究 |
On sound field uncertainty in shallow water with few sound speed profiles |
投稿时间:2011-11-11 修订日期:2012-02-10 |
DOI:10.3969/j.issn1000-3630.2013.01.002 |
中文关键词: 声传播不确定性 声速剖面 经验正交函数 扩展向量 传播损失 |
英文关键词: uncertainty of acoustic propagation sound speed profile empirical orthogonal function extrapolating vector transmission loss |
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中文摘要: |
当只有少量的浅海实测声速剖面时,不能直接利用Monte Carlo法研究声传播的不确定性。基于经验正交函数法,提出扩展向量法对少量实测声速剖面进行扩展,产生与实测声速剖面统计量基本一致的扩展声速剖面,基于Monte Carlo法,利用扩展后的声速剖面计算了声传播损失概率密度分布。结果表明,扩展向量元素服从标准正态分布,扩展后的数据捕捉到了未能测量到、但可能存在的声速剖面,该方法为浅海环境下实测声速剖面数据较少时,研究声传播不确定性提供了一种新的途径。 |
英文摘要: |
Acoustic propagation uncertainty cannot be studied directly by using Monte Carlo method with few measured sound speed profiles (SSPs) in shallow waters. The extrapolating vector method based on empirical orthogonal function (EOF) method is proposed for obtaining the extrapolated SSP with the same statistics as those of the measured SSPs, and then the probability density function (PDF) of transmission loss (TL) is calculated with the extrapolated SSP based on Monte Carlo method. The results demonstrate that the elements of extrapolating vector should satisfy standard normal distribution, and SSPs which are not measured experimentally but possibly exist are captured in the extrapolated data. The proposed method provides a new way to analyze uncertainty of acoustic propagation with few measured SSPs in shallow waters. |
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