矢量拖曳线列阵声呐流噪声的空间相关性研究  

On investigation of the spatial correlation of the flow induced noise in the application of vector hydrophone towed arrays

作　　者：杨秀庭[1] 孙贵青[1] 李敏[1] 李启虎[1] 

机构地区：[1]中科院声学研究所

出　　处：《声学学报》2007年第6期547-552,共6页Acta Acustica

基　　金：国家自然科学基金(60532040);国家安全重大基础研究(613660201;5132102ZZT22);所长择优基金(GS08SJJ09)资助项目

摘　　要：根据湍流边界层脉动压力谱的Corcos模型,采用频率-波数域上的二维谱分析方法对矢量拖曳线列阵声呐拖缆护套管内的流噪声场进行了研究,得到了流噪声声压和振速的一般表达式。在此基础上,计算了管内流噪声场的空间相关性。数值计算结果表明:(1)流噪声的轴向相关性随阵元间距的增加而迅速衰减,不同矢量阵元所接收的流噪声可近似认为是彼此互不相关的;(2)在拖缆的径向上,流噪声的低频分量是高度相关的,而其高频分量的相关性则可近似忽略。Following the Corcos＇s model of cross spectrum of the turbulent boundary layer pressure, a method in the frequency - wave number domain is presented to analyze the flow induced noise in the interior hose of the vector hydrophone towed linear array. As a result, the general forms of the acoustic pressure and particle velocity have been obtained, and the spatial correlations of the flow induced noise have also been calculated. The numerical results show that, the spatial correlations of flow induced noise drop rapidly with the increase of the axial separation between the elements, so the flow induced noise received by different vector hydrophones can be considered as independent. Furthermore, the low frequency component of the flow induced noise is highly correlated in the radial direction, but the radial correlations of the high frequency component can be neglected at the same time.

关 键 词：拖曳线列阵声呐 空间相关性 流噪声 矢量 阵元间距 计算结果 湍流边界层 一般表达式 

分 类 号：O427[理学—声学]