A multimode mechanism-guided product quality estimation approach for multi-rate industrial processes

Discrete and delayed laboratory analyses of product quality restrict the operational opti-mization of industrial processes. However, it is challenging to build an accurate online esti-mation model for product quality because of complex process dynamics, multiple working conditions, and multi-rate characteristics. Therefore, a multimode mechanism-guided pro-duct quality variable estimation model is proposed in this study. First, representative fea-tures are extracted from high-dimensional and redundant process variables via both feature engineering and deep learning to describe the internal reaction state. Then, the rep-resentative features are used to partition the data samples which are used to train the multi-mode long short-term memory (LSTM) network to increase the adaptability of the estimation model. Finally, the LSTM units are cascaded to learn the variation in the quality variable against time to handle the multi-rate problem. The mechanism models are placed in parallel with the LSTM units to guide the learning process. The estimation model utilizes production data, mechanism knowledge and working condition information, which increases model interpretability and adaptability. A zinc fluidized bed roaster is used to illustrate the proposed estimation approach. The simulation results demonstrate the feasi-bility and effectiveness of the proposed multi-rate estimation approach.(c) 2022 Elsevier Inc. All rights reserved.

Automated summary

This study proposes a multimode mechanism-guided product quality variable estimation model. Representative features are extracted through feature engineering and deep learning, and a multi-mode LSTM network is trained to increase adaptability. The LSTM units are cascaded to handle the multi-rate problem, and mechanism models guide the learning process. The estimation model utilizes production data, mechanism knowledge, and working condition information for improved interpretability and adaptability.