A New Method for Structural Damage Location Based on Acoustic Emission

Abstract

The invention relates to the field of damage detection, in particular to a new method for locating structural damage based on acoustic emission. S1, collect the acoustic emission signals when the structure to be tested is damaged by each acoustic emission sensor; S2, calculate the time difference between the acoustic emission signals reaching any two acoustic emission sensors; S3, input all the time differences in step S2 into the training In the neural network model, the damage position of the structure to be tested is obtained, and the damage position is the relative position between the damage position of the structure to be tested and one of the acoustic emission sensors S. The detection method of the invention can reduce the influence of the acoustic emission signal on the accuracy of the detected damage position due to the dispersion phenomenon, the propagation path and the environmental noise during the propagation process.

Description

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

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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