Novel structural damage positioning method based on acoustic emission

Abstract

The invention relates to the field of damage detection, in particular to a novel structural damage positioning method based on acoustic emission. The method comprises the following steps: S1, collecting acoustic emission signals emitted when a to-be-detected structure is damaged through each acoustic emission sensor; S2, calculating the time difference of the acoustic emission signals arriving at any two acoustic emission sensors; S3, inputting all the time differences in the step S2 into a trained neural network model, and obtaining the damage position of the to-be-detected structure, wherein the damage position is the relative position between the damage position of the to-be-detected structure and one acoustic emission sensor S. The detection method provided by the invention can reduce the influence of a frequency dispersion phenomenon, a propagation path and the environmental noise on the accuracy of the detected damage position in the propagation process of the acoustic emission signals.

Description

technical field [0001] The invention relates to the field of damage detection, in particular to a new method for structural damage location based on acoustic emission. Background technique [0002] The orthotropic steel deck (structure) is welded by mutually perpendicular longitudinal ribs, diaphragms, and decks. Due to the dense arrangement of longitudinal ribs and the sparse arrangement of transverse diaphragms in structure, there is a large difference in stiffness in two directions perpendicular to each other, so it is called orthotropic steel bridge deck. With the advantages of light weight, good integrity and large bearing capacity, the structure better solves the contradiction between the bridge's self-weight, load-bearing and span, and is widely used in large and medium-sized highway and railway bridges at home and abroad. However, the orthotropic steel bridge deck not only participates in the overall stress of the structure as a part of the main girder, but also dir...

AI Technical Summary

Problems solved by technology

However, the orthotropic steel bridge deck not only participates in the overall stress of the structure as a part of the main girder, but also directly bears the repeated load of the wheel, resulting in too many local stress cycles, plus the influence of welding defects and stress concentration , making it prone to fatigue cracks

If the cracks cannot be found in time, it will also cause problems such as water accumulation in the longitudinal ribs, further reduce the service performance and durability of the bridge, lead to the collapse of the bridge deck system, and even cause the sudden destruction of the entire bridge

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