Journal
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
Volume 127, Issue -, Pages 121-131Publisher
ELSEVIER
DOI: 10.1016/j.chemolab.2013.06.013
Keywords
Weighted kernel principal; component analysis; Nonlinear process monitoring; Probability density estimation; Moving window
Categories
Funding
- 973 project of China [2013CB733600]
- National Natural Science Foundation of China [21176073]
- Program for New Century Excellent Talents in University [NCET-09-0346]
- Fundamental Research Funds for the Central Universities
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Kernel principal component analysis (KPCA) has been widely used in nonlinear process monitoring: however, KPCA does not always perform efficiently because useful information may be submerged under retained KPCs. To address this shortcoming, probability density estimation- and moving weighted window-based KPCA (PM-WKPCA) is proposed. PM-WKPCA is used mainly to estimate the probability and evaluate the importance of each KPC by kernel density estimation and then set different weighting values on KPCs to highlight the useful information. The status of the process is also evaluated comprehensively using weighted statistics within a moving window. The efficiency of the proposed method is demonstrated by the following: case studies on a numerical nonlinear system, the simulated continuously stirred tank reactor process, and the Tennessee Eastman process. Monitoring results indicate that the proposed method is superior to the conventional PCA, KPCA, and some typical extension methods. (C) 2013 Elsevier B.V. All rights reserved.
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