Journal of the Korean Institute of Intelligent Systems (한국지능시스템학회논문지)

Korean Institute of Intelligent Systems (한국지능시스템학회)
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An Optimal COA Defuzzifier for a Fuzzy Logic controller

퍼지 논리 제어기를 위한 최적의 COA 비퍼지화기

  • 조인현 (동아대학교 컴퓨터공학과) ;
  • 이동석 (동아대학교 컴퓨터공학과) ;
  • 김종훈 (동아대학교 컴퓨터공학과) ;
  • 김대진 (동아대학교 컴퓨터공학과)
  • Published : 1996.12.01
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Abstract

This paper proposes an optimal COA(Center Of Area) defuzzification method that improves the contr~lp erformance of a fuzzy logic controller. The defuzzification method incorporates both the membership values and the effective span of membership function6 in calculating a crisp value. An optimal effective span is determined automatically by the genetic algorithm thrqugh the training of some typical examples. Simulation of the proposed COA defuzzifier to the truck backer-upper control problem is presented and the control performance of the praposed COA defuzzifier outperforms that of the conventional COA defuzzifier by more than 20% in terms of ayerage tracing distance.

본 논문은 퍼지 논리 제어기의 제어 성능을 향상시키는 최적의 COA(Center Of Area) 비퍼지화 방법을 제안한다. 제안한 비퍼지화 방법은 플랜트의 제어를 위해 필요한 확정치(Crisp Value)를 얻기 위해 소속 함수값과 소속함수의 폭을 동시에 이용한다. 주어진 문제에 가장 최적인 소속 함수의 폭은 유전자 알고리즘에 의해 자동적으로 결정된다. 제안한 비퍼지화 방법을 트럭 후진(Truck backer-upper) 제어 문제에 적용하여 얻어진 시뮬레이션 결과로부터 소속 함수만을 고려한 기존의 COA 비퍼지화 방법보다 평균 주행거리 면에서 20% 이상 짧아짐을 확인하였다.

Keywords

References

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