Method and device for detecting leakage of fluid conveying pipeline based on wavelet and mode identification

Abstract

The invention disclose a method and a device for detecting leakage of a fluid conveying pipeline based on wavelet and mode identification, belonging to the technical field of fault diagnosis. The detection device comprise pressure transmitters, an ARM processor, a local area network and a GRS global positioning timing system; two ends of the fluid conveying pipeline comprise a head station and a tail station and are provided with the pressure transmitters which are connected with the ARM processor; the GPS and the ARM processor are connected; and the head station and the station exchange real-time data through the high speed local area network. The detection method comprises the following steps of: collecting pressure data of the two ends of the pipeline; sending the data to the ARM processor; confirming the position of a leakage point; if the leakage point does not locate on the two ends of the pipeline, then carrying out a judgment by utilizing a neural network module; and if the leakage exists, then generating an alarm. The invention can effectively decrease false alarm rate, reduce false judgments and omitted judgments; and through judging on a suspected leakage curve, manually increasing a target vector database, and perfecting an expert database, the invention is beneficial to improving analysis and perceptivity of operators on a leakage curve.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis, in particular to a method and device for detecting leakage of a fluid delivery pipeline based on wavelet and pattern recognition. Background technique [0002] With the development of the national economy, pipelines are playing an irreplaceable role in transporting fluids such as refined oil and crude oil due to their unique advantages in fluid transportation. However, with the development of pipeline transportation, aging, corrosion and man-made theft driven by economic interests have led to frequent pipeline leakage accidents, resulting in major economic losses, environmental pollution and safety hazards. Rapid and accurate detection of pipeline leakage is of great significance to the protection of the natural environment and national property. [0003] The negative pressure wave method means that when a pipeline leaks, the pressure at the leak will suddenly drop due to material loss, ...

AI Technical Summary

Problems solved by technology

[0005] At present, the main method of analyzing the output signal of the pressure transmitter is the wavelet transform method, which has the advantages of accurate positioning and high response sensitivity, and at the same time, the cost is that the probability of false alarms is relatively high, which is easy to cause waste of manpower and material resources, and cause on-site monitoring personnel to report alarms. weakened response

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