Abnormal signal orientation method in pipeline

Abstract

The invention provides an abnormal signal orientation method in a pipeline. The method comprises the following steps of: acquiring and extracting output signals of two transmitters of a preset time length as first acquired data; performing normalization processing, mean adjustment and bipolar processing of the output signals on two frames of data of the first acquired data to obtain second acquired data; searching a signal maximum extreme value from the two frames of data of the second acquired data according polarity of the signal and performing trailing edge processing of an abnormal signal on the two frames of data of the second acquired data to obtain third acquired data; performing forward and backward bidirectional one-time linear interpolation of M-1 points on any path of signal for the third acquired data to form two interpolation sequences; and calculating cross correlation coefficient curves of the two sequences and another signal sequence respectively to obtain propagation direction of a pipeline leakage signal. According to the method, the propagation direction of the abnormal signal in the pipeline can be reliably determined.

Description

technical field [0001] The present invention relates to the technical field of abnormal signal propagation and orientation in pipelines with short-distance installation intervals of double transmitters, in particular to the technical field of abnormal signal orientation in pipeline leakage location in pipeline networks such as natural gas and liquid transportation, especially to pipeline networks An anomaly signal orientation method in the pipeline to determine the propagation direction of the anomaly signal in the pipeline. Background technique [0002] As one of the five major transportation industries, pipeline transportation, such as natural gas transportation and liquid (such as sewage, oil, etc.) transportation, plays an irreplaceable role in national economic construction, especially urban construction. However, the pipeline network formed by these transportation pipelines Due to reasons such as long-term service, corrosion and aging, and man-made damage, leakage acci...

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Problems solved by technology

[0005] However, due to the existence of interference signals, the limitation of sampling accuracy and the limitation of sampling period, in order to accurately determine the propagation direction of abnormal signals, the installation distance between the two transmitters is actually required to be much larger than the above theoretical value

The installation spacing requirements of two adjacent transmitters are far from being met by the existing stations and valve rooms, so that the propagation direction of abnormal signals in the pipeline cannot be well determined in actual work, nor can it be satisfied. practical work needs

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