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37 results on '"Xie, Chao-Fan"'

5. Stability and Convergence Analysis of the Discrete Dynamical System for Simulating a Moving Bed.

Author

Xie, Chao-Fan, Zhang, Hong, and Hwang, Rey-Chue

Subjects
*FINITE difference method, *MOVING bed reactors, *FINITE element method, *PARTIAL differential equations, *CHEMICAL engineering
Abstract

The efficiency of controlling the simulated moving bed (SMB) has long been a critical issue in the chemical engineering industry. Most existing research relies on finite element methods, which often result in lower control efficiency and are unable to achieve online control. To enhance control over the SMB process, this paper employs the Crank–Nicolson method to develop a discrete dynamical model. This approach allows for the investigation of system stability and convergence, fundamentally addressing the sources of error. During the discretization of partial differential equations (PDEs), two main types of errors arise: intrinsic errors from the method itself and truncation errors due to derivative approximations and the discretization process. Research indicates that for the former, the iterative process remains convergent as long as the time and spatial steps are sufficiently small. Regarding truncation errors, studies have demonstrated that they exhibit second-order behavior relative to time and spatial steps. The theoretical validation shows that the iteration works effectively, and simulations confirm that the finite difference method is stable and performs well with varying SMB system parameters and controller processes. This provides a solid theoretical foundation for practical, real-time online control. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Parameter Estimation of Redundant System

Author

Xie, Chao-Fan, Xu, Lin, Zhang, Fuquan, Xu, Lu-Xiong, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Pan, Jeng-Shyang, editor, Li, Jianpo, editor, and Tsai, Pei-Wei, editor

Published
2020
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14. The Order and Failure Estimation of Redundancy System Based on Cobweb Model

Author

Xie, Chao-Fan, Xu, Lin, Xu, Lu-Xiong, Zhang, Fuquan, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Krömer, Pavel, editor, Alba, Enrique, editor, Pan, Jeng-Shyang, editor, and Snášel, Václav, editor

Published
2018
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18. Application of Intelligent Control in Chromatography Separation Process.

Author

Xie, Chao-Fan, Zhang, Hong, and Hwang, Rey-Chue

Subjects
INTELLIGENT control systems, CHEMICAL products manufacturing, SEPARATION (Technology), MOVING bed reactors, WATER consumption
Abstract

Chromatographic separation plays a pivotal role in the manufacturing of chemical products and biopharmaceuticals. This technique exploits differences in distribution between stationary and mobile phases to separate mixtures, impacting final product quality. Simulated moving bed (SMB) technology, recognized for its continuous feed, enhances efficiency and increases production capacity while reducing solvent and water consumption. Despite its complexity in controlling variables like flow rates and valve switching times, traditional control theories fall short. This study introduces an intelligent fuzzy controller resembling an approximate neural network (NN) for SMB control. Simulation results demonstrate the controller's effectiveness in achieving desirable outcomes for the SMB system. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Evaluation System Based on Neural Network Model

Author

Xu Lin, Xie Chao-Fan, and Xu Lu-Xiong

Subjects
Probabilistic neural network, Evaluation system, Artificial neural network, business.industry, Time delay neural network, Computer science, Artificial intelligence, business
Published
2017

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