基于动态压力信号的管道泄漏特征提取方法研究

Extraction method for pipeline leakage feature based on dynamic pressure signal

动态压力变送器能直接测量管道压力的动态变化,因而比基于普通压力变送器的管道泄漏检测具有更高的灵敏度。研制了一种应用于长输油气管道泄漏检测的动态压力变送器,并介绍了其结构组成和工作原理。用动态压力变送器获取了管道的动态压力信号,利用经验模态分解的方法将信号分解为多个固有模态函数(IMF)之和,选择主要的IMF分量进行归一化峭度分析,从而提取信号的特征向量。现场应用实例表明,该方法能够有效地对管道泄漏和调泵调阀等事件进行特征信号提取。

A dynamic pressure transmitter for the long-distance oil and gas transmission pipeline was designed.The dynamic pressure transmitter can directly measure the dynamic change of pipeline pressure.In the pipeline leakage detection,the dynamic pressure transmitter has higher sensitivity than the general pressure transmitter to obtain the dynamic pressure signal along the pipeline.Then the detected signal was decomposed into a sum of finite intrinsic mode functions（IMF） by empirical mode decomposition（EMD）.The normalized kurtosis value of the main IMF components was analyzed,and the eigenvectors of the detected signal could be extracted.The application examples show that the features of the signals resulted from pipeline leakage or operations of pump and valve can be extracted by the signal analysis method.