水中运动声源的声全息参数选取研究

Investigations on Parameter Selection of Acoustic Holography of Underwater Moving Noise Sources

针对水中运动噪声源难以识别问题,采用声全息技术建立运动噪声源的声全息动态识别方法,详细推导全息重构公式,建立测量系统和重构声源的坐标系关系,利用采集到含有多普勒效应的声信号构造出全息数据完成重建,对运动声源的信号采集和多普勒消除等方法进行研究。利用所编制的程序进行仿真验证,分析重构参数的选取原则,给出重构频率、重构距离和采样间隔对重构结果的影响。为验证理论和仿真结果,设计制作12元声压阵列测量系统,在消声水池进行水中声全息试验,试验结果表明该方法能够快速准确地对运动声源进行声场重构,研究的参数选取原则能够大大简化水中运动噪声源全息定位的复杂程度,该方法及系统可以有效地用于水中运动声源的测量分析。

Appling this method to identify underwater moving noise sources,the principle of the acoustic holography method for the identification of moving noise sources is presented.In addition,the discrete expression of the reconstruction method has been systematically addressed.The theoretical formulation has been systematically addressed by employing a moving coordinate which has relative motion between the measurement coordinate and the hologram coordinate.The received signal considering the Doppler effect is used to holographic reconstruction.It demonstrates the idea of utilizing this method constructs the desired hologram and how to remove Doppler effect.The numerical simulations have been conducted and some rules for determining parameters are further discussed.It has been taken the influences of the measuring parameters into account sufficiently according to the practical conditions.At last,underwater acoustical holography experiments are carried out in anechoic pool with a line array of 12 hydrophones.The experimental results prove the validity of the method which used to the reconstruction of underwater moving sources.The significance is that this selection of parameters has an advantage over the reconstruction of underwater moving noise sources,which is valuable to the measuring and analysis of underwater moving sources.