Water supply pipeline leakage detecting and positioning method

Abstract

The invention provides a water supply pipeline leakage detecting and positioning method which is characterized in that a signal collected by a sensor is subjected to enhancement through spectral subtraction, the frequency spectrum variance of the signal after enhancement is calculated, a double-threshold method is adopted for judgment, that is, if the frequency spectrum variance is within the threshold range, which indicates that leakage occurs, the leakage point is positioned, a BP neural network is utilized to form a filter, a water leakage signal is separated from noise and subjected to generalized correlation analysis, time delay estimation is carried out according to the weight function with a good signal-to-noise ratio selectivity, three time delays of the sensor are acquired, and a water leakage positioning model is utilized for calculation to acquire water leakage point position information. According to the water supply pipeline leakage detecting and positioning method, the spectral subtraction method is adopted for signal enhancement, the double-threshold method is utilized for leakage judgment, if the frequency spectrum variance is within the threshold range, which indicates that leakage occurs, and therefore the accuracy is higher; besides, the non-leakage estimation method is adopted for estimation of the noise spectrum, the signal-to-noise ratio is increased more obviously, meanwhile the BP neural network is adopted for filtering, the generalized correlation time delay estimation accuracy is improved, and the water leakage point positioning accuracy is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of water leakage detection and positioning, and in particular relates to a water supply pipeline leakage detection and positioning method. Background technique [0002] Leakage detection and location of tap water pipelines is an important prerequisite for pipeline maintenance and repair. According to official statistics, the average leakage rate of water supply pipe networks in more than 600 cities in China exceeds 20%, and the highest is more than 60%. In most areas of our country, the leakage can only be judged when the tap water leaks in a large area, or even the pipeline bursts. Therefore, detecting and locating the leakage point in time is of great significance for saving water resources. [0003] The actual pipeline water leakage signal is a mixture of the leakage signal and various background noises. The leakage signal can be considered as a stable signal. Environmental noise includes pipeline vibr...

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Problems solved by technology

The leakage signal can be considered as a stable signal. Environmental noise includes pipeline vibration noise caused by running water flow, ground vibration caused by motor vehicle drivi...

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