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IEICE TRANSACTIONS on Fundamentals

Chaotic Responses in a Self–Recurrent Fuzzy Inference with Nonlinear Rules

Kazuo SAKAI, Tomio MACHIDA, Masao MUKAIDONO

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Summary :

It is shown that a self–recurrent fuzzy inference can cause chaotic responses at least three membership functions, if the inference rules are set to represent nonlinear relations such as pie–kneading transformation. This system has single input and single output both with crisp values, in which membership functions is taken to be triangular. Extensions to infinite memberships are proposed, so as to reproduce the continuum case of one–dimensional logistic map f(x)=Ax(1–x). And bifurcation diagrams are calculated for number N of memberships of 3, 5, 9 and 17. It is found from bifurcation diagrams that different periodic states coexist at the same bifurcation parameter for N9. This indicates multistability necessarily accompanied with hysteresis effects. Therefore, it is concluded that the final states are not uniquely determined by fuzzy inferences with sufficiently large number of memberships.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E77-A No.11 pp.1736-1741
Publication Date
1994/11/25
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Section on Nonlinear Theory and Its Applications)
Category
Fuzzy System--Theory and Applications--

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