Abstract
Purpose
This study presents a nonlinear transformation-based data augmentation approach to diagnose delaminations such as interlaminar, through-hole and buckle, in relatively complex composites. The approach uses tailored vibration signals of relatively simplified composites and employs a convolutional neural network (CNN).
Methods
The present study involves modeling several composite structures with and without interlaminar, through-hole and buckle delaminations using finite-element method (FEM)-based simulation. A vibration experiment is also conducted for the case of interlaminar delamination. In our method, it is assumed that all vibration signals of simplified composites and healthy condition of complex real composites are obtained that paves the way to investigate the delamination conditions of real composites. Then, the present approach adopts the nonlinear transformation method mapping the signals of complex healthy composites and simplified healthy composites. The difference between the transformed signals of complex real composites and the reference signals of simplified composites is utilized for the virtual spectrogram computed by the short-time Fourier Transform (STFT). These virtual spectrograms fed into a CNN-based diagnosis system to diagnose the types and locations of delaminations.
Results
For interlaminar cases, the simulation and experimental vibration signals are diagnosed with 100 and 92.5%, respectively. Through-hole and buckle cases are both diagnosed with an accuracy of 100%. Using nonlinear transformation to classify vibration signals prior to diagnosis has been shown to be highly advantageous for delamination diagnosis.
Conclusion
The results allow the diagnosis of three cases of complex composites with simplified composites using the delamination diagnosis system.
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Data Availibility
Data are available from the corresponding author on reasonable request.
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Funding
The authors are grateful for financial support received from National Research Foundation (NRF) of the Korea grant funded by Korea government (MSIT) (No. 2018R1A5A7025522).
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Appendix
Appendix
Detail Geometries
In this present study, various geometries are employed to conduct several examples. These geometries were applied identically to the finite-element models. Table 1 shows the detailed geometries of the finite-element models. In the experiment, data were generated by repeating the experiment for each single geometry specimen. Table 2 shows the detailed geometries of the experiment specimens.
Auxiliary Example 1: Vertical Through-Hole
For the auxiliary example, the through-hole case is investigated in Fig. 16. The same material properties are set except for the through-hole. The responses of the through-holes with 5 mm diameter at the three different locations (57.5 mm, 115 mm and 172.5 mm distances from the end of the right side) are computed. The three different holes of complex delaminated models are modeled differently from simplified delaminated models and located at 100 mm, 200 mm and 300 mm distances from the end of the right side. The boundary condition including the impact loading is set to the same of the first example. The responses of the simplified reference models (H.R.S.) with and without the through-hole are easily obtained and the response of the complex healthy model (H.S.) is obtained prior. The nonlinear transformation function can be defined in Fig 17a. Then, the response of the unknown real system is measured and mapped in Fig. 17b. This transformed signal is then defined as the mapped unknown signal (M.U.S.) in Fig. 17b. By comparing the simplified reference signals and mapped complex signals, the condition of the unknown model can be approximately determined. The training and verification data were decided with the virtual spectrograms generated by the differences between the vibration signals of the simplified and complex models in Fig. 18. In the diagnosis system, Fig. 9a shows that it is possible to diagnose the through-hole and health conditions with high accuracy and the diagnosis system that applied the concept of transfer learning using CNN was effective.
Auxiliary Example 2: Buckle Delamination with Compressive Force
For the auxiliary example, a monitoring problem for buckle delamination which is one of the most widely observed failures especially for thin film or coating on a substrate is considered in Fig. 19. All the detailed parameters are presented in the figures. In Figs. 19, Fig. 20, Fig. 21 and Fig. 9b, the results show that the present scheme can be applied for the buckle delamination too.
Finally, the diagnosis system is performed once more to diagnose all delamination types (interlaminar, through-hole and buckle delamination cases) and locations. To carry out the diagnosis, 5 data are selected for all cases and are used for training and verification data. As a result, it was possible to make a diagnosis system to classify various delamination types and locations successfully with 100% accuracy in Fig. 10. Although the diagnosis of delaminations using the FE model is performed well, the diagnosis may not be performed with high accuracy in a real experiment.
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Kim, DY., Woo, YJ., Sim, SG. et al. Delamination Diagnosis System Using Nonlinear Transformation-Based Augmentation Approach for CNN Transfer Learning. J. Vib. Eng. Technol. 12, 3213–3230 (2024). https://doi.org/10.1007/s42417-023-01040-1
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DOI: https://doi.org/10.1007/s42417-023-01040-1