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Sliding mode control: an approach to regulate nonlinear chemical processes

Camacho1, Smith

  • 1Departamento de Circuitos y Medias, Universidad de Los Andes, Merida, Venezuela. ocamacho@ing.ula.ve

ISA Transactions
|June 28, 2000
PubMed
Summary
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A new sliding mode controller design uses a simple process model. This method provides fixed controller structures and tuning equations for improved performance in chemical processes.

Area of Science:

  • Chemical Engineering
  • Control Systems

Background:

  • First-order-plus-deadtime (FOPDT) models are common in process control.
  • Designing controllers for nonlinear systems presents challenges.

Purpose of the Study:

  • To develop a novel sliding mode controller design method.
  • To create a fixed-structure controller with straightforward tuning.

Main Methods:

  • The controller design is based on a first-order-plus-deadtime (FOPDT) process model.
  • Tuning equations are derived as a function of the FOPDT model's characteristic parameters.

Main Results:

  • A fixed-structure sliding mode controller was successfully designed.
  • Simulations on two nonlinear chemical processes demonstrated effective controller performance.

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Conclusions:

  • The proposed approach offers a systematic way to design sliding mode controllers for FOPDT processes.
  • The method is suitable for controlling nonlinear chemical systems.