基于SCOT加权广义互相关算法的船舶管系泄漏定位研究

Research on the Ship Pipeline Leakage Localization Based on SCOT Estimator

船舶管系泄漏可以根据测得的两个声学信号时间延迟的精确估算值进行定位。针对在复杂的船舶噪声环境下管系泄漏定位困难,提出SCOT加权广义互相关算法。对传感器接收到的声波信号先进行自适应滤波,提高信号相似度,再对滤波器权值进行平滑相干加权得到广义互相关函数来估计时延。该方法具有较强的鲁棒性,又不依赖于统计先验知识。实验证明,SCOT加权广义互相关算法适用于复杂的船舶噪声环境,提高了泄漏定位精度。

The position of a leak in ship piping, may be determined by accurate estimation of the time delay between two meas- ured acoustic signals. In complex ship noise environments, it is difficult to get the position of a leak in ship piping. Therefore, a method of time delay estimation was proposed on generalized correlation which was weighted by SCOT. The sound source signal re- ceived by the sensors was adaptively filtered, so the signal similarity was improved. Then the filter weight was multiplied by a smooth coherent weight function to get the generalized cross correlation function to estimate the time delay. This method of time delay estima- tion has strong robustness and is not dependent on prior knowledge of statistics. The experimental results show it is more suitable for getting the position of the leak in complex ship noise environment, and it improves the precision.