Non-linear ultrasonic guided wave parameter-free damage identification method and system based on frequency fusion

A non-linear ultrasonic and non-linear damage technology, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, processing detection response signals, instruments, etc., can solve problems such as damage identification methods that are difficult to monitor structures, and achieve broad application prospects and The effect of engineering use value, reducing operation risk and operation and maintenance cost, and prolonging the service life of the structure

Pending Publication Date: 2022-04-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most of the current damage identification algorithms rely on the baseline signal of the complete structure, but external environmental factors have a greater impact on the propagation of ultrasonic guided waves, making it difficult for the damage identification method based on the baseline signal to achieve long-term structural monitoring.

Method used

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  • Non-linear ultrasonic guided wave parameter-free damage identification method and system based on frequency fusion
  • Non-linear ultrasonic guided wave parameter-free damage identification method and system based on frequency fusion
  • Non-linear ultrasonic guided wave parameter-free damage identification method and system based on frequency fusion

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Embodiment 1

[0050]Embodiment 1 of the present invention provides a nonlinear ultrasonic guided wave non-parametric damage identification method based on frequency fusion, including the following process:

[0051] Obtain the optimal excitation frequency of the target detection area;

[0052] According to the optimal excitation frequency, the response signals when multiple frequencies symmetrically within the positive and negative intervals of the optimal frequency are obtained as the excitation frequency are obtained;

[0053] According to the second harmonic and third harmonic of each response signal, the nonlinear damage index corresponding to each excitation frequency is obtained;

[0054] The probability map of each excitation frequency is obtained by using the probability test reconstruction imaging method;

[0055] All the probability images are superimposed to obtain the final imaging result, and the point with the highest probability in the final imaging result is used as the dama...

Embodiment 2

[0092] Embodiment 2 of the present invention provides a nonlinear ultrasonic guided wave non-parametric damage identification system based on frequency fusion, including:

[0093] The optimum excitation frequency acquisition module is configured to: acquire the optimum excitation frequency of the target detection area;

[0094] The response signal acquisition module is configured to: according to the optimal excitation frequency, obtain a plurality of symmetrical frequencies within the positive and negative intervals of the optimal frequency as the response signal when the excitation frequency is used;

[0095] The nonlinear damage index acquisition module is configured to: obtain the nonlinear damage index corresponding to each excitation frequency according to the second harmonic and the third harmonic of each response signal;

[0096] The probability map generation module is configured to: use the probability test reconstruction imaging method to obtain the probability map ...

Embodiment 3

[0100] Embodiment 3 of the present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the non-linear ultrasonic guided wave parametric damage-free based on frequency fusion as described in Embodiment 1 of the present invention is realized. Identify the steps in the method.

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Abstract

The invention provides a non-linear ultrasonic guided wave parameter-free damage identification method and system based on frequency fusion. The method comprises the following steps: acquiring the optimal excitation frequency of a target detection area; according to the optimal excitation frequency, obtaining response signals when a plurality of symmetrical frequencies in the positive and negative intervals of the optimal frequency are used as excitation frequencies; obtaining a nonlinear damage index corresponding to each excitation frequency according to the second harmonic and the third harmonic of each response signal; obtaining a probability graph of each excitation frequency by using a probability test reconstruction imaging method; overlapping all probability images to obtain a final imaging result, and taking a point with the maximum probability in the final imaging result as a damage positioning point; according to the method, the influence of the optimal excitation frequency on the algorithm is weakened through frequency fusion, external interference is compensated, higher harmonic characteristic parameters serve as damage indexes, a probability test reconstruction algorithm method is applied to the field of nonlinear imaging, and higher-precision imaging and positioning recognition of structural damage are achieved.

Description

technical field [0001] The invention relates to the technical field of damage identification, in particular to a non-parametric damage identification method and system based on frequency fusion of nonlinear ultrasonic guided waves. Background technique [0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art. [0003] At present, large-scale industrial equipment and high-end equipment are widely used in metallurgy and chemical industry, high-end manufacturing industry, aerospace, rail transit, shipbuilding and other fields. Most of their operating environments are always accompanied by harsh working conditions such as alternating loads, pneumatic pressures, vibrations and shocks, variable temperature and humidity, etc., and are extremely prone to various damages such as fatigue cracks, corrosion, bumps and notches, which seriously affect safety and reliability and endanger property and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/46
CPCG01N29/04G01N29/46G01N2291/023
Inventor 贾磊腾飞宇姜明顺张法业张雷隋青美
Owner SHANDONG UNIV
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