期刊
NEURAL NETWORKS
卷 154, 期 -, 页码 455-468出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neunet.2022.06.010
关键词
Gaussian mixture model; Multigrade-process; Process dynamics; Process monitoring; Sparse data; Variational autoencoder
资金
- Ministry of Science and Technology, Taiwan, R.O.C. [MOST 109-2221-E-033- 013-MY3, MOST 110-2221-E-007-014]
This paper introduces a method called source-aided variational state-space autoencoder (SA-VSSAE) for monitoring industrial processes with sparse target data. The method enhances the reliability of the target model by performing information sharing. Compared to traditional state-space models, SA-VSSAE extracts dynamic and nonlinear features and incorporates process uncertainty in a probabilistic form.
In industrial processes, different operating conditions and ratios of ingredients are used to produce multi-grade products in the same production line. Yet, the production grade changes so quickly as the demand from customers varies from time to time. As a result, the process data collected in certain operating regions are often scarce. Process dynamics, nonlinearity, and process uncertainty increase the hardship in developing a reliable model to monitor the process status. In this paper, the sourceaided variational state-space autoencoder (SA-VSSAE) is proposed. It integrates variational state-space autoencoder with the Gaussian mixture. With the additional information from the source grades, SAVSSAE can be used for monitoring processes with sparse target data by performing information sharing to enhance the reliability of the target model. Unlike the past works which perform information sharing and modeling in a two-step procedure, the proposed model is designed for information sharing and modeling in a one-step procedure without causing information loss. In contrast to the traditional state-space model, which is linear and deterministic, the variational state-space autoencoder (VSSAE) extracts the dynamic and nonlinear features in the process variables using neural networks. Also, by taking process uncertainty into consideration, VSSAE describes the features in a probabilistic form. Probability density estimates of the residual and latent variables are given to design the monitoring indices for fault detection. A numerical example and an industrial polyvinyl chloride drying process are presented to show the advantages of the proposed method over the comparative methods. (c) 2022 Elsevier Ltd. All rights reserved.
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