Journal
AICHE JOURNAL
Volume 61, Issue 12, Pages 4126-4139Publisher
WILEY
DOI: 10.1002/aic.14937
Keywords
latent variable model; slow feature analysis; process data analysis; soft sensor
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Funding
- National Basic Research Program of China [2012CB720505]
- National Science Engineering Research Council of Canada (NSERC)
- Alberta Innovates Technology Futures (AITF)
- National Natural Science Foundation of China [21276137]
- China Scholarship Council (CSC)
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Latent variable (LV) models provide explicit representations of underlying driving forces of process variations and retain the dominant information of process data. In this study, slow features (SFs) as temporally correlated LVs are derived using probabilistic SF analysis. SFs evolving in a state-space form effectively represent nominal variations of processes, some of which are potentially correlated to quality variables and hence help improving the prediction performance of soft sensors. An efficient expectation maximum algorithm is proposed to estimate parameters of the probabilistic model, which turns out to be suitable for analyzing massive process data. Two criteria are also proposed to select quality-relevant SFs. The validity and advantages of the proposed method are demonstrated via two case studies. (c) 2015 American Institute of Chemical Engineers
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