Journal
IFAC PAPERSONLINE
Volume 48, Issue 8, Pages 611-616Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ifacol.2015.09.035
Keywords
Kernel input-output canonical variate analysis; process monitoring; quality monitoring; principal component analysis
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Funding
- National Nature Science Foundation of China [61273160]
- Doctoral Fund of Shandong Province [BS2012ZZ011]
- Fundamental Research Funds for the Central Universities [14CX02174A]
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Traditional process monitoring methods based on kernel canonical variate analysis do not extract variances. They cannot judge whether a process fault that is detected affects product quality. A nonlinear quality-relevant process monitoring method based on kernel input-output canonical variate analysis (KIOCVA) is proposed. Firstly, Process variables and quality variables are mapped into higher-dimensional linear feature spaces via unknown nonlinear mappings respectively The higher-dimensional linear feature spaces are projected to three subspaces. an input-output correlated subspace that captures correlations between process data and quality data, an uncorrelated input subspace and an uncorrelated output subspace. To monitoring the variances of the uncorrelated input subspace and the uncorrelated output subspace, principal component analysis is performed. Correlations and variances in the higher-dimensional linear feature spaces are extracted by means of nonlinear kernel functions. The proposed KIOCVA method can judge the process fault that is detected affects product quality or not. The effectiveness of the proposed method is demonstrated by case studies of Tennessee Eastman process. (C) 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. Ail rights reserved.
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