Three-dimensional damage rapid positioning method for complex aqueduct structure

By employing the shortest path principle and numerical difference iteration method in the aqueduct structure, the problem of low damage localization efficiency in curved structures was solved, and efficient and accurate three-dimensional damage source localization was achieved.

CN121431677BActive Publication Date: 2026-06-09SICHUAN XIANGJIABA IRRIGATION DISTRICT CONSTRUCTION & DEVELOPMENT CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN XIANGJIABA IRRIGATION DISTRICT CONSTRUCTION & DEVELOPMENT CO LTD
Filing Date
2025-12-23
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies struggle to achieve efficient three-dimensional damage localization in aqueducts with curved surfaces, especially since traditional linear propagation models fail and ray tracing-based methods are computationally intensive and unsuitable for thin-walled structures.

Method used

By employing the concept of shortest path on curved surfaces combined with numerical difference and fast iteration methods, a parameterized model of the aqueduct cross section is established. The first arrival time of the signal is picked up using the STA/LTA long-short time window energy ratio method, a set of propagation paths on the aqueduct surface is constructed, and the coordinates of the damage source are solved by using the Jacobian matrix and damped least squares iteration.

Benefits of technology

It achieves efficient and robust three-dimensional damage source localization for complex aqueduct structures, simplifies the calculation process, and improves localization accuracy and efficiency.

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Abstract

The present application relates to the field of hydraulic structure, particularly to a kind of three-dimensional damage fast positioning method of complex aqueduct structure;Acoustic emission or microseismic signal in aqueduct structure is collected, and STA / LTA long-short time window energy ratio method is used to pick up the first arrival time of signal;Curved surface structure model composed of channel surface and side wall is constructed;Parameterization is carried out to cross section, and according to the position relationship of damage point and sensor in parameter space, channel surface propagation path set is constructed;For each pair of damage point and sensor, the path with the minimum path length of channel surface is selected as the shortest propagation path, and the theoretical arrival time is calculated accordingly;Residual function between theoretical arrival time and measured arrival time is established, and Jacobian matrix of arrival time variation is constructed;Damage source coordinates and occurrence time are solved.The present application establishes the parameterization model of aqueduct cross section, uses the shortest path idea of curved surface to replace traditional ray tracing, and combines numerical difference and fast iteration method, to realize efficient and robust damage source positioning.
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Citation Information

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