声学浮标流噪声谱和空间相关特性分析

Property analysis on flow noise spectrum of acoustic buoy and space correlation

为了克服声学浮标在海洋环境中工作时的流噪声干扰,提高接收信号信噪比和记录数据质量,分析流噪声的成因,建立声学浮标流噪声谱理论模型。并应用模型仿真计算声学浮标水听器接收流噪声功率谱和空间相关半径,通过分析水听器接收流噪声功率谱特性和相关关系,得出声学浮标流噪声与海浪的大小有关,随着各水听器垂直速度增大而增大;同时,声学浮标流噪声的空间相关半径与水听器的长度有关,当水听器的长度为0.1 m时,流噪声频率150 Hz的空间相关半径约为10 cm。通过海上实验测试数据与模型仿真的性能一致性分析,验证了声学浮标流噪声功率谱理论模型和相关分析的正确性。

In order to overcome the disturbance of flow-induced noise,improve the signal to noise ratio of the received signal and the quality of the recorded data,analyze the cause of the flow-induced noise,a theoretical model of flowinduced noise spectrum on the acoustic buoy was established.In addition,the model was applied to calculate power spectrum and space correlation radius of flow-induced noise,which was received by the acoustic buoy hydrophones.By analyzing the properties of the power spectrum and the correlation,it was found that the flow-induced noise is correlated to the size of wave and increases following the increase of the vertical velocity of hydrophone;in addition,the space correlation radius of flow-induced noise of acoustic buoy is related to the length of the hydrophone.When the length of the hydrophone is 0.10 meter,the space correlation radius of the flow-induced noise with f=150 Hz is about 10 cm.By analyzing the unanimity between marine experimental data and the simulative performance of model,the correctness of the theoretical model on the power spectrum of flow noise of acoustic buoy and the relevant analysis were verified.