Journal of Industrial Technology (산업기술연구)
- Volume 16
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- Pages.231-237
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- 1996
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- 1229-9588(pISSN)
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- 1598-1371(eISSN)
A Quantitative Analysis of the Nonlinearity of Fuzzy Logic Controller
퍼지논리 제어기의 비선형성의 정량적 해석
Abstract
In this paper, the nonlinear I/O characteristic of fuzzy logic controller is analyzed by using cell concept. Sources of the nonlinearity in a fuzzy logic controller include the fuzzification, the fuzzy reasoning and the defuzzification. A closed form expression for the defuzzified output is derived in case of a fuzzy logic controller with two inputs, triangular memberships, MacVicar-Whelan type linguistic rules, and direct fuzzy reasoning. As a result, it is shown that fuzzy logic controller is a nonlinear controller. Also its nonlinearity is analyzed with respect to the conventional PID control and the sliding mode control.
Keywords