基于拖曳线列阵声纳的噪声监测仿真方法

A simulation of radiated noise detecion based on towed array

为便捷获取潜艇辐射噪声,设计了利用艇载拖曳线列阵声纳通过本艇回转机动进行测量的方案。利用潜艇拖曳阵模型,仿真生成了各水听器阵元与本艇的位置关系;根据噪声源理论模型产生了潜艇模拟噪声,利用深海传播模型模拟噪声在海洋环境中的传播衰减。对阵元信号分别利用MVDR、空间平滑MVDR以及适应子带的BMUSIC算法进行处理,在一定频率范围内可以分辨出近距离的不同辐射声源,得到辐射噪声的声源强度、频谱结构和位置信息,进而获取艇上机械工况异常信息。

In order to get the submarine noise easily and expediently, a simulation of determining the feasibility of using submarine＇s towed hydrophone array is made for source localization measurements via a constant radius turn manoeuvre. Position parameters are got by the simulation based on the model of towed-array. Limited by the testing condition, based on the theory of radiated noise forming, the noise sources are simulated. And the noise is processed with a sound loss translation model in the sea. MVDR （Minimum Variance Distortionless Response）, Spatially Smoothed MVDR and BMUSIC algorithms are adopted for beamforming. Different sources with a short distance can be separated in the range of special frequency hand, and then the source level, the frequency spectrum and the location of the source can he obtained, which can be further used to detect machine malfunction.