An Iterative Recursion Based Acoustic Location Method for Multiple Leakage Points in Water Supply Pipelines

Abstract

The invention discloses a water supply pipeline multi-leakage point sound positioning method based on iterative recursion. The method mainly comprises two parts of leakage sound signal cross spectrumphase spectrum calculation and multi-leakage source iteration estimation. Firstly, cross-power spectrum analysis is carried out for collected multi-leakage point sound signals, and the signal cross spectrum phase spectrum and corresponding frequency point distribution are determined. In the multi-leakage source iterative estimation process, the signals are firstly subjected to generalized cross-correlation time delay estimation, a linear change line group of the signal cross spectrum phase spectrum is determined according to the time delay estimation value, and frequency points associated withleakage points are determined through utilizing the linear change line group step by step. Estimation of the next leakage point is realized through removing the frequency points associated with the previous leakage point in the signals, and the number and the position of the pipeline leakage points are estimated through multiple times of iterative recursion calculation.

Description

technical field [0001] The invention relates to a method for locating multiple leak points in a water supply pipeline, in particular to a method for locating multiple leak points in a pipeline based on iterative recursion. The method is suitable for analysis and processing of leak sound signals of water supply pipes, and belongs to the field of non-destructive testing. Background technique [0002] Urban water supply pipeline is an important infrastructure in modern society. However, due to environmental corrosion, water pressure fluctuations and external disturbances, leakage of water supply pipelines occurs from time to time. The leakage of the water supply pipeline will not only cause the waste of water resources, but also cause secondary disasters such as ground collapse due to erosion of the surrounding foundations. Safe operation and avoidance of resource waste have important theoretical significance and application value. [0003] For the needs of urban pipeline le...

Images