Jun Li This email address is being protected from spambots. You need JavaScript enabled to view it.1 and Zhengmei Zhao1

1School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R. China


Received: September 20, 2020
Accepted: January 11, 2021
Publication Date: June 1, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202106_24(3).0018  


The critical issue in soft sensing modeling of the chemical processes is how to model multidimensional data with noise and strong nonlinearity. To handle the uncertainty of modeling and minimize the impact of uncertainty, a class of method using interval type-2 Takagi–Sugeno–Kang (TSK) fuzzy logic systems (FLS) combining the principal component analysis (PCA) algorithm are proposed. First, the linear principal components from the input variables of model can be effectively extracted by the PCA algorithm. The number of fuzzy rules is regarded as the clustering center, and the fuzzy c-means (FCM) clustering algorithm is then applied. The result of clustering centers is used as the centers of the fuzzy rule antecedent. Second, soft sensing models are established based on three types of interval type-2 TSK FLS, namely, A1-C1, A2-C0 and A2-C1, and the backpropagation(BP) algorithm is used to update the parameters of the antecedent and consequent membership function. To verify the effectiveness of the proposed method, different types of interval type-2 TSK FLS were applied to the soft sensing modeling prediction of three key product yields for industrial fluidized catalytic cracking unit. Experimental results confirm that, compared with other types of FLS methods and support vector machine, the employed Type-2 TSK FLS method with different types can achieve better prediction accuracy, among them, the A2-C1 TSK FLS method has higher modeling accuracy and faster convergence.

Keywords: soft sensors; modeling; interval type-2 TSK fuzzy logic system; principal component analysis; chemical process


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