水下目标低频辐射噪声矢量声场干涉测试分析

Experimental and Analysis About Vector Acoustic Interference of Underwater Target Low-Frequency Radiated Noise

矢量传感器具有与频率无关的偶极子指向性,可以同步、共点和独立测量声场中的声压和质点振速,在水下目标辐射噪声测量领域得到广泛应用.本文采用虚源干涉模型和简正波矢量声场理论,计算和仿真分析了水下目标低频辐射噪声声压与质点振速近程声场的时间-频率干涉图案,利用单矢量传感器辐射噪声测量系统在北黄海海域对单个和两个目标的水下辐射噪声进行了测试和分析.结果表明:水下目标低频辐射噪声声场质点振速水平分量与声压的时间-频率干涉条纹具有相似性,而声场质点振速比声压的时间-频率干涉条纹清晰,且质点振速能够抑制目标与目标辐射噪声之间的干涉;利用质点振速LOFAR图,可以判定水下目标的数目,区分水面和水下目标.

The vector sensor has dipole directionality which was independent of frequency,which could measure sound pressure and particle velocity synchronously,concurrently and independently.It was widely used in underwater target radiated noise measuring domain.It was simulated and analyzed about time-frequency interference pattern of acoustic field pressure and particle velocity of underwater target low-frequency radiated noise based on fictitious interference model and normal-mode vector acoustic theory.The underwater radiation noise of single and two targets in the north the Yellow Sea is tested and analyzed by using the single vector sensor radiation noise measurement system.The result show that horizontal component of the particle velocity is similar to the time frequency interference fringe of the sound pressure in the low frequency radiation noise of the underwater target.and particle velocity is clearer than the time frequency interference fringe of the sound pressure the particle velocity of vector hydrophone can restrain interference of two target radiated noise,it can judge underwater target number and distinguish surface or underwater target making use of diagram of particle velocity.