CAJ | 학술논문

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。
위료강저시량타예선렬진류조성，제고시량타예선렬진적공작성능，수요연구기류조성장적분포규률，근거세장원주외표면단류변계층（ TBL）압력기복적Carpenter모형，채용파수－빈솔보분석방법도출타선진호투내원주형시량수은기류조성장성압화축향질점진속급기시－공상관구진적일반표체식，병유수치적분법계산료류조성장적공간상관성。수치계산결과표명：착대류조성축향상관반경재궤십전미범위내，이반파장포진적시량타예선렬진각진원소접수적류조성재축향상시근사불상관적；착대류조성경향상관성수착빈솔이급경향위치변화교대；관대류조성성압화축향질점진속지간시근사불상관적，저야위후치신호처리산법억제류조성제공이론의거。
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 turbu?lent 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 ax?ial 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 theo?retical basis for suppressing the flow noise through the post signal processing algorithm.