A comparison of several machine learning techniques for the centerline segregation prediction in continuous cast steel slabs and evaluation of its performance. (English) Zbl 1422.74082
Summary: Centerline segregation in steel cast products is an internal defect that can be very harmful when slabs are rolled in heavy plate mills. Consequently, anticipate its presence is a matter of importance to prevent future risks. The aim of this study was to obtain a predictive model able to perform an early detection of central segregation severity in continuous cast steel slabs. This study presents a novel hybrid algorithm, based on support vector machines (SVMs) in combination with the particle swarm optimization (PSO) technique, for predicting the centerline segregation from operation input parameters determined experimentally in continuous cast steel slabs. This optimization technique involves kernel parameter setting in the SVM training procedure, which significantly influences the regression accuracy. Additionally, a multilayer perceptron network (MLP) and a multivariate adaptive regression splines (MARS) approach, this last method also in combination with the particle swarm optimization (PSO) technique, were fitted to the experimental data with comparison purposes. To this end, the most important physical-chemical parameters of this industrial process are monitored and analyzed. The results of the present study are two-fold. In the first place, the significance of each physical-chemical variables on the segregation is presented through the model. Secondly, some models for predicting segregation are obtained with success. Indeed, regression with optimal hyperparameters was performed and coefficients of determination equal to 0.98 for continuity factor estimation and 0.97 for average width were obtained when this hybrid PSO-SVM-based model with RBF kernel function was applied to the experimental dataset, respectively. Furthermore, the results obtained with the MLP and PSO-MARS-based models are clearly worse than those obtained with the PSO-RBF-SVM-based model. The agreement between experimental data and the model confirmed the good performance of the latter. Finally, conclusions of this innovative research work are exposed.
MSC:
| 74N05 | Crystals in solids |
| 62G08 | Nonparametric regression and quantile regression |
| 62H30 | Classification and discrimination; cluster analysis (statistical aspects) |
| 68T05 | Learning and adaptive systems in artificial intelligence |
| 68T20 | Problem solving in the context of artificial intelligence (heuristics, search strategies, etc.) |
Keywords:
support vector machines (SVMs); multivariate adaptive regression splines (MARS); particle swarm optimization (PSO); artificial neural networks (ANNs); continuous cast steel slabs; centerline segregation predictionReferences:
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