Water supply pipe leakage detection locating signal processing method

Abstract

The invention discloses a water supply pipe leakage detection locating signal processing method. The method includes: firstly determining the burst interference exists to the acquired information, if the burst interference exists, performing burst interference removing process, if the burst interference does not exist or the burst interference has been removed, performing noise suppression process to the signal; as a whole de-noising pretreatment process is completed, determining whether the leakage exists according to the processed signal, and adding a function of identifying the difference from the true leakage to the fixed interference sound source during the determination, if the leakage does not exist, directly giving out the detecting result, if it passes the identification and the true leakage exists, further performing leak point positioning, and giving out the final test results and the leakage point position. The invention has beneficial technical effect of improving signal quality by removing burst interference in the acquired signal and noise restraining and the like de-noising processes when performing leakage detection to the water supply pipe, thereby enhancing the pipeline leak detection accuracy and leak-point positioning accuracy under complex noise environments; having practical value that it firstly determines whether true leakage acoustic singles are included in the acquired signal and then locates the leakage points.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of fluid delivery pipelines, in particular to a signal processing method for detecting and locating leaks of water supply pipelines. Background technique [0002] When the water supply pipeline leaks, when the high-pressure water in the water pipe is sprayed outward from the leakage of the pipeline, due to the interaction between the embedded media such as cavitation noise, turbulent noise, friction between the injected water and the pipe wall, and water impacting the soil outside the pipe, It will cause acoustic vibration at the pipeline leak, such as figure 1 shown. By picking up the acoustic signal in the pipeline or on the ground, performing corresponding signal processing, and extracting the detection information, it is possible to judge whether a leak has occurred and locate the leak point. Picking up the vibration and acoustic signals caused by leaks for detection is the main diff...

AI Technical Summary

Problems solved by technology

[0004] In the process of leak detection and location, when picking up the acoustic signal of water supply pipeline leakage, the environmental conditions are complex, and various types of unpredictable non-stationary interference may occur at any time, such as traffic noise such as car horns and engines, and ground drilling during mechanical construction. Vibration and shock, the sound of machines running, the voice noise of human speech, etc., the existence of non-stationary interference will directly lead to the failure of detection and positioning methods; The noise generated by the reflection of the sudden change of the cross section and pipe wall material, the water noise excited at the valve and the elbow, etc. are affected by various stationary noises, so the signal-to-noise ratio of the actually received leakage observation signal is extremely low, thus affecting the detection sensitivity and positioning results the accuracy of

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