Nonlinear Decoupling Control with ANFIS-Based Unmodeled Dynamics Compensation for a Class of Complex Industrial Processes

Yajun Zhang, Tianyou Chai, Hong Wang, DIanhui Wang, Xinkai Chen

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Complex industrial processes are multivariable and generally exhibit strong coupling among their control loops with heavy nonlinear nature. These make it very difficult to obtain an accurate model. As a result, the conventional and data-driven control methods are difficult to apply. Using a twin-tank level control system as an example, a novel multivariable decoupling control algorithm with adaptive neural-fuzzy inference system (ANFIS)-based unmodeled dynamics (UD) compensation is proposed in this paper for a class of complex industrial processes. At first, a nonlinear multivariable decoupling controller with UD compensation is introduced. Different from the existing methods, the decomposition estimation algorithm using ANFIS is employed to estimate the UD, and the desired estimating and decoupling control effects are achieved. Second, the proposed method does not require the complicated switching mechanism which has been commonly used in the literature. This significantly simplifies the obtained decoupling algorithm and its realization. Third, based on some new lemmas and theorems, the conditions on the stability and convergence of the closed-loop system are analyzed to show the uniform boundedness of all the variables. This is then followed by the summary on experimental tests on a heavily coupled nonlinear twin-tank system that demonstrates the effectiveness and the practicability of the proposed method.

Original languageEnglish
Pages (from-to)2352-2366
Number of pages15
JournalIEEE Transactions on Neural Networks and Learning Systems
Issue number6
Publication statusPublished - 2018 Jun


  • Adaptive neural-fuzzy inference system (ANFIS)
  • complex industrial process
  • decoupling
  • multivariable and nonlinear systems
  • twin-tank level control system

ASJC Scopus subject areas

  • Software
  • Computer Science Applications
  • Computer Networks and Communications
  • Artificial Intelligence


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