CN-121977171-A - Dynamic detection method and system for secondary water supply leakage

CN121977171ACN 121977171 ACN121977171 ACN 121977171ACN-121977171-A

Abstract

The invention provides a dynamic detection method and a dynamic detection system for secondary water supply leakage, which relate to the technical field of intelligent sensors and comprise the steps of collecting dynamic polarization relaxation signals in real time according to a distributed sensor array attached to the outer wall of a pipeline, carrying out optimization correction on the dynamic polarization relaxation signals to obtain corresponding dynamic polarization relaxation correction signals, carrying out feature extraction on the dynamic polarization relaxation correction signals to obtain corresponding polarization relaxation characteristic parameters, constructing a correlation model of the polarization relaxation characteristic parameters, leakage positions and leakage amounts according to a pipeline three-dimensional model and pressure field distribution data, adding non-leakage interference factor indexes to the correlation model to obtain corresponding suspicious leakage areas, and carrying out quick inversion calculation on corresponding leakage point coordinates according to the suspicious leakage areas to implement a corresponding maintenance scheme.

Inventors

ZHOU FEI
SHEN TAO
TONG JING
WANG XIANGBING
HU HAIDONG
Dai Kaihua

Assignees

浙江宁鼎环保科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260202

Claims (9)

1. A dynamic detection method for secondary water supply leaks, the method comprising: collecting dynamic polarization relaxation signals in real time according to a distributed sensor array attached to the outer wall of a pipeline; Performing optimization correction on the dynamic polarization relaxation signals to obtain corresponding dynamic polarization relaxation correction signals; extracting features of the dynamic polarization relaxation correction signals to obtain corresponding polarization relaxation feature parameters; According to the three-dimensional model of the pipeline and the pressure field distribution data, constructing a correlation model of the polarization relaxation characteristic parameters, the leakage position and the leakage amount, adding a non-leakage interference factor index to the correlation model, and further obtaining a corresponding suspicious leakage area; and according to the suspicious leakage area, rapidly inverting and calculating the corresponding leakage point coordinates, and further implementing a corresponding maintenance scheme.
2. A dynamic detection method for secondary water leakage according to claim 1, wherein the process of acquiring dynamic polarization relaxation signals comprises: according to the pipe diameter, pipe material, pipe burial depth and pipe trend of the secondary water supply pipe, distributed optical fiber polarization sensor arrays are uniformly distributed along the axial direction of the outer wall of the pipe, signal acquisition parameters are set, and then each sensor unit is synchronously controlled through a data acquisition terminal, and dynamic polarization relaxation signals of different positions of the outer wall of the pipe are acquired in real time.
3. A dynamic detection method for secondary water leakage according to claim 2, wherein the process of optimally correcting the dynamic polarization relaxation signal comprises: Taking the dynamic polarization relaxation signal in the leakage-free state as a baseline signal, and carrying out baseline correction on the dynamic polarization relaxation signal according to the baseline signal; performing temperature compensation correction on the dynamic polarization relaxation signals after baseline correction based on the corresponding acquired environmental temperature data; And filtering and denoising the dynamic polarization relaxation signals subjected to temperature compensation correction, so as to obtain dynamic polarization relaxation correction signals.
4. A dynamic detection method for secondary water leakage according to claim 3 wherein the process of feature extraction of the dynamic polarization relaxation correction signal comprises: Calculating relaxation time according to the dynamic polarization relaxation correction signal by adopting an exponential decay fitting method; When (when) And when the polarization intensity of the corresponding position approaches to the polarization intensity steady-state value, obtaining the polarization intensity steady-state value reduction amplitude of the corresponding position according to the steady-state polarization intensity in the leakage-free state and the polarization intensity steady-state value of the corresponding position.
5. The method for dynamic detection of secondary water supply leaks according to claim 4, wherein the process of constructing a model of the correlation of the polarization relaxation characteristic parameters with the leak location, leak amount, comprises: and constructing a leakage quantity multiple regression model and a preliminary leakage risk judging model according to the inherent correlation of the polarization relaxation characteristic parameters, the leakage quantity and the leakage position.
6. The method for dynamic detection of secondary water supply leaks according to claim 5, wherein non-leakage interference factor indices are added to the correlation model to obtain corresponding suspicious leak regions.
7. The method for dynamic detection of secondary water supply leakage according to claim 6, wherein the three-dimensional coordinates of the leakage point including the axial coordinates, the radial coordinates and the circumferential coordinates of the leakage point are determined by a weighted least squares inversion method based on the polarization relaxation characteristic parameters and the pressure field data in the suspicious leakage area.
8. The method for dynamic detection of secondary water supply leaks according to claim 7, wherein the step-wise maintenance scheme is formulated according to the leakage quantity multiple regression model and the three-dimensional coordinates of the leakage points, and comprises a micro leakage maintenance scheme, a medium leakage maintenance scheme and a large leakage maintenance scheme.
9. A dynamic detection system for secondary water supply leakage, which realizes the dynamic detection method for secondary water supply leakage according to any one of the claims 1 to 8, and is characterized by comprising a data acquisition module, a data correction module, a feature extraction module, a correlation model construction module and an intelligent positioning module; The data acquisition module is used for acquiring dynamic polarization relaxation signals in real time according to the distributed sensor array attached to the outer wall of the pipeline; the data correction module is used for carrying out optimization correction on the dynamic polarization relaxation signals to obtain corresponding dynamic polarization relaxation correction signals; the feature extraction module is used for carrying out feature extraction on the dynamic polarization relaxation correction signals to obtain corresponding polarization relaxation feature parameters; The correlation model construction module is used for constructing a correlation model of the polarization relaxation characteristic parameters, the leakage position and the leakage amount according to the pipeline three-dimensional model and the pressure field distribution data; And the intelligent positioning module is used for rapidly inverting and calculating the corresponding leakage point coordinates according to the suspicious leakage area.

Description

Dynamic detection method and system for secondary water supply leakage Technical Field The invention relates to the technical field of intelligent sensors, in particular to a dynamic detection method and a system for secondary water supply leakage. Background The secondary water supply is used as a key link of the urban water supply system, and the running state of the pipeline is directly related to the water supply stability and the water resource utilization rate. The current secondary water supply pipeline is buried underground in many ways, and is influenced by various factors such as geological environment change, pipeline aging, material loss and the like, and leakage problems frequently occur. The existing leakage detection method is mostly dependent on manual inspection, pressure monitoring or single-point sensing detection, and has the problems of low detection hysteresis, weak resistance of interference factors, insufficient positioning accuracy of leakage positions and leakage amounts and the like. Meanwhile, the prior art is difficult to establish accurate association between the detection signal characteristics and leakage parameters, cannot quickly realize three-dimensional positioning and grading maintenance guidance of leakage points, and brings a plurality of troubles to the efficient operation and maintenance of a secondary water supply pipeline. Accordingly, a dynamic detection method and system for secondary water leakage is now provided. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a dynamic detection method and a system for secondary water supply leakage. In order to achieve the above purpose, the invention provides a dynamic detection method for secondary water supply leakage, which comprises the following steps: collecting dynamic polarization relaxation signals in real time according to a distributed sensor array attached to the outer wall of a pipeline; Performing optimization correction on the dynamic polarization relaxation signals to obtain corresponding dynamic polarization relaxation correction signals; extracting features of the dynamic polarization relaxation correction signals to obtain corresponding polarization relaxation feature parameters; According to the three-dimensional model of the pipeline and the pressure field distribution data, constructing a correlation model of the polarization relaxation characteristic parameters, the leakage position and the leakage amount, adding a non-leakage interference factor index to the correlation model, and further obtaining a corresponding suspicious leakage area; and according to the suspicious leakage area, rapidly inverting and calculating the corresponding leakage point coordinates, and further implementing a corresponding maintenance scheme. Further, the process of acquiring dynamic polarization relaxation signals includes: according to the pipe diameter, pipe material, pipe burial depth and pipe trend of the secondary water supply pipe, distributed optical fiber polarization sensor arrays are uniformly distributed along the axial direction of the outer wall of the pipe, signal acquisition parameters are set, and then each sensor unit is synchronously controlled through a data acquisition terminal, and dynamic polarization relaxation signals of different positions of the outer wall of the pipe are acquired in real time. Further, the process of optimally correcting the dynamic polarization relaxation signal includes: Taking the dynamic polarization relaxation signal in the leakage-free state as a baseline signal, and carrying out baseline correction on the dynamic polarization relaxation signal according to the baseline signal; performing temperature compensation correction on the dynamic polarization relaxation signals after baseline correction based on the corresponding acquired environmental temperature data; And filtering and denoising the dynamic polarization relaxation signals subjected to temperature compensation correction, so as to obtain dynamic polarization relaxation correction signals. Further, the process of extracting features from the dynamic polarization relaxation correction signal includes: Calculating relaxation time according to the dynamic polarization relaxation correction signal by adopting an exponential decay fitting method; When (when) And when the polarization intensity of the corresponding position approaches to the polarization intensity steady-state value, obtaining the polarization intensity steady-state value reduction amplitude of the corresponding position according to the steady-state polarization intensity in the leakage-free state and the polarization intensity steady-state value of the corresponding position. Further, the process of constructing the correlation model of the polarization relaxation characteristic parameter and the leakage position and leakage amount comprises the following steps: and constructing a leakage quantity multip