摘要
为了降低矢量拖曳线列阵流噪声,提高矢量拖曳线列阵的工作性能,需要研究其流噪声场的分布规律,根据细长圆柱外表面湍流边界层(TBL)压力起伏的Carpenter模型,采用波数-频率谱分析方法导出拖线阵护套内圆柱形矢量水听器流噪声场声压和轴向质点振速及其时-空相关矩阵的一般表达式,并由数值积分法计算了流噪声场的空间相关性。数值计算结果表明:窄带流噪声轴向相关半径在几十厘米范围内,以半波长布阵的矢量拖曳线列阵各阵元所接收的流噪声在轴向上是近似不相关的;窄带流噪声径向相关性随着频率以及径向位置变化较大;宽带流噪声声压和轴向质点振速之间是近似不相关的,这也为后置信号处理算法抑制流噪声提供理论依据。
In order to depress the flow-induced noise of vector towed linear array,improve its performance,it is necessary to study the distribution of the flow noise field. Following the Carpenter model that is based on the turbulent boundary layer（ TBL） of a long,thin cylinder,the general mathematical expressions of the acoustic pressure of the flow-induced noise of a cylindrical vector hydrophone in towered line array sheath,the axial particle velocity,and their temporal-spatial correlation matrix are derived. The spatial correlation of the flow noise is then calculated by numerical integration. The numerical calculation results showed that within the tens of centimeter range of the axial correlation radius of narrowband flow noise,the flow noise received by vector hydrophone＇s elements of towed linear array based on half wavelength is approximately uncorrelated in the axial direction. It also showed that the frequency and radial position have great influences on the radial spatial correlations of narrowband flow noise. The pressure and axial particle velocity of wideband flow noise are approximately uncorrelated,thereby providing a theoretical basis for suppressing the flow noise through the post signal processing algorithm.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2015年第1期57-61,共5页
Journal of Harbin Engineering University
基金
水声技术重点实验室基金资助项目(9140C2002021001)
