Damage identification method and equipment based on two-dimensional convolutional neural network

Abstract

The invention discloses a damage identification method and device based on a two-dimensional convolutional neural network, and belongs to the field of structural health monitoring, and the method comprises the steps: carrying out the frequency sweeping in a preset frequency band, and measuring the conductance signal of a structure at each frequency point; dividing the preset frequency band into a plurality of sub-frequency bands, calculating the deviation of the conductance signal in each sub-frequency band relative to the conductance signal in each sub-frequency band in a non-damage state, and taking the n sub-frequency bands with the maximum deviation as a target frequency band; extracting one-dimensional conductance signals under n target frequency bands, and constructing two-dimensional data by every two one-dimensional conductance signals to obtain a prediction sample; inputting the prediction sample into a trained damage identification model so as to predict the current quality loss amount of the structure and obtain the damage state of the structure; wherein the damage identification model is a two-dimensional convolutional neural network and is used for predicting the mass loss amount of the structure through two-dimensional data. According to the method, the different electrical impedance information can be accurately classified and quantified, and quantitative analysis and characterization of structural damage are realized.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, and more specifically relates to a damage identification method and equipment based on a two-dimensional convolutional neural network. Background technique [0002] With the rapid development of infrastructure construction, various large-scale civil and industrial buildings have emerged one after another, and gradually move towards diversification, sophistication, complexity and internationalization. At the same time as the development of my country's architecture, people's requirements for structural safety have increased with it. For all kinds of buildings at present, the loads are gradually complicated, including direct loads, indirect loads and accidental loads, and the coupling of this series of loads often leads to structural fatigue damage, structural damage and resistance decline. In addition, the building may also be affected by its own and external factors during its use, su...

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Problems solved by technology

[0003] However, piezoelectric impedance technology also has its problems. Although this method can use the changes in the impedance spectrum measured by piezoelectric sheets to reflect structural damage and realize damage identification of complex structures, the judgment of damage is mostly at the qualitative level, which is difficult to achieve. Quantification and characterization of structural damage

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