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Journal of Zhejiang University SCIENCE C 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/FITEE.2300058


Separation identification of neural fuzzy wiener-hammerstein system using hybrid signals


Author(s):  Feng LI, Hao YANG, Qingfeng CAO

Affiliation(s):  College of Electrical and Information Engineering, Jiangsu University of Technology, Changzhou 213001, China; more

Corresponding email(s):   lifeng@jsut.edu.cn

Key Words:  Wiener-Hammerstein system, Neural fuzzy network, Correlation technique, Hybrid signals, Identification strategy


Feng LI, Hao YANG, Qingfeng CAO. Separation identification of neural fuzzy wiener-hammerstein system using hybrid signals[J]. Frontiers of Information Technology & Electronic Engineering, 1998, -1(-1): .

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author="Feng LI, Hao YANG, Qingfeng CAO",
journal="Frontiers of Information Technology & Electronic Engineering",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/FITEE.2300058"
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Abstract: 
A novel separation identification strategy for the neural fuzzy wiener-Hammerstein system using hybrid signals was developed in this study. The wiener-Hammerstein system is described by a model consisting of two linear dynamic elements with a static nonlinear element in between. The static nonlinear element is modeled by a neural fuzzy network (NFN) and the two linear dynamic elements are modeled by an autoregressive exogenous (ARX) model and an autoregressive model (AR), respectively. When the system input is Gaussian signals, the correlation technique is used to decouple the identification of the two linear dynamic elements from the nonlinear element. First, based on the input-output of Gaussian signals, the correlation analysis technique is used to identify the input linear element and output linear element, which addresses the problem that the intermediate variable information cannot be measured in the identified wiener-Hammerstein system. Then, zero-pole match method is adopted to separate the parameters of the two linear elements. Furthermore, the recursive least squares technique is used for identifying the nonlinear element based on the input-output of random signals, which avoids the impact of output noise. The feasibility of the presented identification technique is demonstrated by an illustrative simulation example and a practical nonlinear process. The simulation results show that the proposed strategy can obtain higher identification precision than existing identification algorithms.

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