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Assessment of Geometrical Features of Internal Flaws with Artificial Neural Network

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Abstract

In nondestructive testing (NDT), geometrical features of a flaw embedded in the material such as its location, length, and orientation are critical factors to assess the severity of the flaw and make post-manufacturing decisions to improve the design. In this study, artificial intelligence (AI) based NDT approach was applied to the ultrasonic oscillograms obtained from virtual ultrasonic NDT to estimate geometrical features of a flaw. First, a numerical model of NDT specimen was constructed using acoustic finite element analysis (FEA) to produce the ultrasonic signals. The model was validated by comparing the simulated signals produced from the numerical model with the experimental data from actual NDT tests. Then, 750 numerical models containing flaws with different locations, lengths, and orientation angles were generated by FEA. Next, the oscillograms produced by the models were divided into 3 datasets: 525 for training, 113 for validation, and 112 for testing. Training inputs of the network were parameters extracted from ultrasonic signals by fitting them to sine functions. Lastly, to evaluate the network performance, outputs of the network including flaw’s location, length, and angle were compared with the desired values for all datasets. Deviations of the outputs from desired values were calculated by a regression analysis. Statistical analysis was also performed by measuring root mean square error (RMSE) and efficiency. RMSE in x-location, y-location, length, and angle estimations are 0.09 mm, 0.19 mm, 0.46 mm, and 0.75°, with efficiencies of 0.9229, 0.9466, 0.9140, and 0.9154, respectively for the testing dataset. Results suggest that the proposed AI-based method has the potential to interpret the oscillograms from ultrasonic NDT to estimate geometrical features of flaws embedded in the material.

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Abbreviations

ρ :

Matter density

C :

Speed of sound

p t :

Total acoustic pressure

t :

Time

q d :

Dipole domain source

Q m :

Monopole domain source

x :

X_location of the crack

y :

Y_location of the crack

l :

Length of the crack

θ :

Angle of the crack

MSE :

Mean squared error

n :

Number of outputs

Y i(j):

ANN output

T i(j):

Desired output

m :

Number of training samples

RMSE :

Root mean square error

X d :

Desired variable

X s :

Estimated variable

E :

Efficiency

X d :

Average of the desired variable

NDT:

Non-destructive testing

ANN:

Artificial neural network

RMSE:

Root mean square error

E:

Efficiency

FFNN:

Feed forward neural network

BP:

Back propagation

FFBP:

Feed forward back propagation

MSE:

Mean squared error

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Acknowledgements

The work was supported by Korea-Canada AI Research for Manufacturing sponsored by Korea Electrotechnology Research Institute (KERI).

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Correspondence to Yanjun Qian.

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Lari, S., Qian, Y. & Kwon, HJ. Assessment of Geometrical Features of Internal Flaws with Artificial Neural Network. Int. J. Precis. Eng. Manuf. 22, 777–789 (2021). https://doi.org/10.1007/s12541-021-00515-z

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