Identification of the nonlinear systems based on the kernel functions

Jimei Li, Feng Ding, Erfu Yang

Research output: Contribution to journalArticlepeer-review


Constructing an appropriate membership function is significant in fuzzy logic control. Based on the multi-model control theory, this article constructs a novel kernel function which can implement the fuzzification and defuzzification processes and reflect the dynamic quality of the nonlinear systems accurately. Then we focus on the identification problems of the nonlinear systems based on the kernel functions. Applying the hierarchical identification principle, we present the hierarchical stochastic gradient algorithm for the nonlinear systems. Meanwhile, the one-dimensional search methods are proposed to solve the problem of determining the optimal step sizes. In order to improve the parameter estimation accuracy, we propose the hierarchical multi-innovation forgetting factor stochastic gradient algorithm by introducing the forgetting factor and using the multi-innovation identification theory. The simulation example is provided to test the proposed algorithms from the aspects of parameter estimation accuracy and prediction performance.
Original languageEnglish
Pages (from-to)6917-6933
Number of pages17
JournalInternational Journal of Robust and Nonlinear Control
Issue number14
Early online date20 Jun 2021
Publication statusPublished - 25 Sep 2021


  • Gaussian membership function
  • gradient search
  • hierarchical identification
  • multi-innovation identification
  • nonlinear system
  • parameter estimation


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