管网泄漏极性相关法定位研究

Research of Leakage Detection for Pipelines Based on Polarity Correlation Algorithm

针对管网泄漏定位运算量大而不易实现在线检测的问题,设计一种运算快速、实时测量的定位方法。以泄漏液体的声学特性为依据,建立测漏模型,将捕获的信号离散化后极化处理,用极性相关法计算渡越时间,从而得到漏点到测点的距离。为验证极性相关法定位的可行性与可靠性,设计声学管网测漏仪。通过实验证明极性相关法能够有效提高相关函数的运算速度,易于在微处理芯片中进行实时分析,实现了工程中管网泄漏的在线定位测量。

Leakage point location of pipelines needs much computation so that it is hard to implement the real-time detection.In order to solve the problem,we designed a leak detect method which can calculate fast to reduce the heavy computation and implement the on line measurement. Based on acoustic characteristics of the liquid leakage,a leak detection model was built to conduct polarization processing after discretizing the captured signal. The distance from leakage point to measuring point can be calculated by using the polarity correlation algorithm to capture the transition？ time. Polarity correlation algorithm can effectively improve the arithmetic speed of correlation function and can make it easy to handle real- time analysis in micro- chips. Based on acoustics,we also designed leak detector of pipelines to verify the detecting method of polarity correlation algorithm. The experiment shows that the detector realizes the online detection of leakage pipelines with sufficient precision in engineering.