[OPTICAL REVIEW Vol. 1, No. 2 (1994) 150-152]

Stability Evaluation of Inference Methods for Optoelectronic Fuzzy Inference System

Hideo ITOH,1 Tatsuya YAMADA,2 Bruno HOUSSAY,1 Seiji MUKAI1 and Shin-ichiro UEKUSA2

1Optical Information Section, Optoelectronics Division, Electrotechnical Laboratory, Tsukuba, Ibaraki, 305 Japan, 2Department of Electronics and Communication, School of Science and Technology, Meiji University, Kanagawa, 214Japan

(Accepted September 9, 1994)

System stability of various membership functions and fuzzy control methods are compared by numerical simulations to determine the feasibility of optoelectronic fuzzy inference method. An inverted pendulum is used for the destination system. A Gaussian membership function is better than a triangular one. MIN operations of grade evaluation and modification of consequent membership functions are better than other operations. SUM operation of consequent operation is better than MAX operation.

Key words : optoelectronic, fuzzy control, Gaussian, product-sum-gravity, beam scanning, system stability, simulation