Type-3 Fuzzy System for Dynamic System Control

Document Type : Research Paper

Authors

1 ASOIU

2 Department of Electrical and Electronic Engineering, AAIRC, Mersin-10, Lefkosa, North Cyprus, Turkey

3 Department of Computer Engineering, AAIRC, Mersin-10, Lefkosa, North Cyprus, Turkey

Abstract

Many dynamic processes are characterized by parametric or structural uncertainties due to internal and external
disturbances. Existing deterministic models could not handle the uncertainties inherent in these processes. A valuable
alternative to control these processes is the use of a type-3 fuzzy system. Since type-3 fuzzy systems use threedimensional
membership functions, they have more capacity to model uncertainties. This paper introduces the design
of a type-3 fuzzy logic system (FLS) for the control of dynamic plants. Utilizing type-3 fuzzy logic, the architecture
of the type-3 fuzzy control system (T3FCS) is proposed. The knowledge base of the controller is constructed and its
design stages are presented. The inference mechanism of type-3 FLS is developed using α slices and interval type-3
membership functions. The proposed type-3 FLS is utilized for controlling nonlinear dynamic plants. The modeling
of the proposed T3FCS is performed and transient response characteristic is derived using different stepwise excitation
signals. A comparison of the designed system with the type-1 FLS-based system is provided. The obtained simulation
result demonstrates the efficiency of using the proposed type-3 FLS in the control of dynamic systems characterized by
uncertainties.

Keywords

Main Subjects


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