• Title/Summary/Keyword: HEU

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A LMS Algorithm with Fuzzy Variable Step Size (퍼지 가변 스텝 크기 LMS 알고리즘)

  • Lee, Chul-Heu;Kim, Koan-Jun
    • Journal of Industrial Technology
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    • v.13
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    • pp.33-41
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    • 1993

  • In this paper, a new LMS algorithm with a fuzzy variable step size (FVS LMS) is presented. The change of step size ${\mu}$, at each iteration which is increases or decreases according to the misadaptation degree, is computed by a proportional fuzzy logic controller. As a result the algorithm has very good convergence speed and low steady-state misadjustment. As a measure of the misadaptation degree, the norm of the cross correlation between the estimation error and input signal is used. Simulation results are presented to compare the performance of the FVSS LMS algorithm with the normalized LMS algorithm.

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Fuzzy PID control System by Parallel PI and PD Control (PI와 PD의 병렬 구성에 의한 퍼지 PID제어 시스템)

  • Lee, Chul-Heu
    • Journal of Industrial Technology
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    • v.13
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    • pp.43-48
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    • 1993

  • In this paper, a new PID fuzzy controller (FC) is presented. The linguistic control rules of PID FC is separated into two parts : one is $e-{\Delta}e$ part, and the other is ${\Delta}^2e-{\Delta}e$ part. And then two FCs employing these rule base indivisually are synthesized. The control input to the process is decided by taking weighted mean of the outputs of two FCs. The proposed PID FC improve the transient response of the system and gives better performance than the conventional PI FC.

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