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A hybrid ICA-SVM approach for determining the quality variables at fault in a multivariate process. (English) Zbl 1264.94066
Summary: The monitoring of a multivariate process with the use of multivariate statistical process control (MSPC) charts has received considerable attention. However, in practice, the use of MSPC chart typically encounters a difficulty. This difficult involves which quality variable or which set of the quality variables is responsible for the generation of the signal. This study proposes a hybrid scheme which is composed of independent component analysis (ICA) and support vector machine (SVM) to determine the fault quality variables when a step-change disturbance existed in a multivariate process. The proposed hybrid ICA-SVM scheme initially applies ICA to the Hotelling $T^{2}$ MSPC chart to generate independent components (ICs). The hidden information of the fault quality variables can be identified in these ICs. The ICs are then served as the input variables of the classifier SVM for performing the classification process. The performance of various process designs is investigated and compared with the typical classification method. Using the proposed approach, the fault quality variables for a multivariate process can be accurately and reliably determined.

MSC:
 94A12 Signal theory (characterization, reconstruction, filtering, etc.) 62P30 Applications of statistics in engineering and industry 62H30 Classification and discrimination; cluster analysis (statistics)
LIBSVM; FastICA
Full Text:
References:
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