Combined use of principal component analysis and self organisation map for condition monitoring in pickling process

Authors:
Salah Bouhouche;Mostepha Yahi;Jürgen Bast
Affiliations:
Iron and Steel Applied Research Unit-CSC, BP 196, Annaba 23000, Algeria;Welding and Control Research Center, CSC, Route Dely Brahim Cheraga, Algiers 16000, Algeria;HGUM, Institut für Maschinenbau, TU Bergakademie Freiberg, Cotta Strasse 4, D-9596, Germany
Venue:
Applied Soft Computing
Year:
2011

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Abstract

Process monitoring using multivariate statistical process control (MSPC) has attracted large industries types due to its practical importance and application. In this paper, a combined use of principal component analysis (PCA) and self organisation map (SOM) algorithms are considered. Habitually PCA method uses T^2 Hoteling's and squared predicted error (SPE) as indexes to classify processes variability. In this paper, new version of indexes called metric distances obtained from the self organisation map (SOM) algorithm replace the conventional indexes proper to PCA. A comparative study between SOM, the conventional PCA and the hybrid form of PCA-SOM is examined. Application is made on the real data obtained from a pickling process. As shown in different figures, the combined approach remains important comparatively to PCA but not more than SOM.