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Steel and Composite Structures Volume 46, Number 3, February10 2023 , pages 319-334 DOI: https://doi.org/10.12989/scs.2023.46.3.319 |
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Crack detection in folded plates with back-propagated artificial neural network |
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Oguzhan Das, Can Gonenli and Duygu Bagci Das
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| Abstract | ||
| Localizing damages is an essential task to monitor the health of the structures since they may not be able to operate anymore. Among the damage detection techniques, non-destructive methods are considerably more preferred than destructive methods since damage can be located without affecting the structural integrity. However, these methods have several drawbacks in terms of detecting abilities, time consumption, cost, and hardware or software requirements. Employing artificial intelligence techniques could overcome such issues and could provide a powerful damage detection model if the technique is utilized correctly. In this study, the crack localization in flat and folded plate structures has been conducted by employing a Backpropagated Artificial Neural Network (BPANN). For this purpose, cracks with 18 different dimensions in thin, flat, and folded structures having 15°, 30° 45° and 60° folding angle have been modeled and subjected to free vibration analysis by employing the Classical Plate Theory with Finite Element Method. A Four-nodded quadrilateral element having six degrees of freedom has been considered to represent those structures mathematically. The first ten natural frequencies have been obtained regarding healthy and cracked structures. To localize the crack, the ratios of the frequencies of the cracked flat and folded structures to those of healthy ones have been taken into account. Those ratios have been given to BPANN as the input variables, while the crack locations have been considered as the output variables. A total of 500 crack locations have been regarded within the dataset obtained from the results of the free vibration analysis. To build the best intelligent model, a feature search has been conducted for BAPNN regarding activation function, the number of hidden layers, and the number of hidden neurons. Regarding the analysis results, it is concluded that the BPANN is able to localize the cracks with an average accuracy of 95.12%. | ||
| Key Words | ||
| crack detection; Finite Element Method; folded plates; machine learning; neural network; vibration | ||
| Address | ||
| Oguzhan Das:National Defence University, Air NCO Higher Vocational School, Department of Aeronautics Sciences, 35410, Izmir, Türkiye Can Gonenli:Ege University, Department of Machine Drawing and Construction, 35100, Izmir, Türkiye Duygu Bagci Das:Ege University, Department of Computer Programming, 35100, Izmir, Türkiye | ||