Roping is a severe band-like surface defect that occurs in deformed aluminum alloy sheets. Accurate roping prediction and rating are essential for industrial applications. Recently, the authors introduced an artificial neural network (ANN) model to efficiently forecast roping behavior across the thickness of large regions with texture gradients. In this study, the previously proposed ANN model for roping prediction is briefly reviewed, and a few-shot learning (FSL)-based method is developed for roping grading with limited samples. To consider the directionality of the roping patterns, the roping dataset constructed from experimental observations is transformed into the frequency domain for more compact characterization. A transfer-based FSL method is further presented for grade roping with manifold mixup regularization and the Sinkhorn mapping algorithm. A new component-focused representation is also implemented for data-processing, exploiting the close correlation between roping and power distribution in the frequency domain. The ultimate FSL method achieved an optimal accuracy of 95.65% in roping classification with only five training samples per class, outperforming four typical FSL methods. This FSL approach can be applied to grade the roping morphologies predicted by the ANN model. Consequently, the combination of prediction and grading using deep learning provides a new paradigm for roping analysis and control.
The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-024-00499-9
Yuan-Zhe Hu
,
Ru-Xue Liu
,
Jia-Peng He
,
Guo-Wei Zhou
,
Da-Yong Li
. Deep learning methods for roping defect analysis in aluminum alloy sheets: prediction and grading[J]. Advances in Manufacturing, 2024
, 12(3)
: 576
-590
.
DOI: 10.1007/s40436-024-00499-9
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