期刊
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
卷 151, 期 -, 页码 190-200出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemolab.2016.01.001
关键词
Multimode process monitoring; Time-space locality preserving coordination; Internal representation; Posterior probability; Global model
类别
资金
- National Natural Science Foundation of China [61374140, 61403072]
In this paper, an original algorithm called time-space locality preserving coordination (TSLPC) is put forward to monitor multimode processes. First, a block-wise matrix with multimodality labels is defined for dealing with the multimode problem. The information of internal representations and posterior probabilities is contained in the defined block-wise matrix. In order to make the posterior probabilities of data belonging to each mode more accurate, a novel distance applying the neighborhood information is developed. Next, considering the within-mode serial correlation, not only nearest data based on the distance but also adjacent data based on the time are selected as neighbors in the proposed TSLPC algorithm. Then, the low-dimensional global characterization of the defined block-wise matrix can be acquired by optimally preserving the neighborhood structure of the dataset. In addition, the proposed TSLPC algorithm establishes a global model for multimode processes on the basis of the defined block-wise matrix, which is different from traditional multimode process monitoring methods where multiple local models corresponding to multiple modes are constructed. Finally, the multimode continuous stirred tank reactor (CSTR) process and the multimode Tennessee Eastman (TE) process are studied to show the advantage of the proposed TSLPC method. (C) 2016 Elsevier B.V. All rights reserved.
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