• 대한전자공학회논문지
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• 제21권3호
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• pp.46-54
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• 1984

Yuwana와 Seborg의 방법으로는 큰 지연시간을 갖는 프로세서에 적용할 수 없는 문제점을 해결하기 위해서 새로운 제어기기 동조방법을 제시하였다. 제시된 동조방법은 제어기기의 기준점에 계단변화를 주는 단일 실험 테스트에 근거하고 있다. 시뮬레이션 결과는, 새로운 방법이 지연시간이 큰 프로세서에도 잘 적용될 뿐만 아니라 단일 실험 테스트 도중 발생할 수 있는 예기치 못한 부하외란에도 불구하고 여러가지 면에서 Ziegler와 Nichols의 방법이나 Cohen과 Coon의 방법보다 월등하다는 것을 보여주고 있다.

• 대한전자공학회논문지
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• 제23권5호
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• pp.647-652
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• 1986

The controller tuning methods proposed by Yuwana-Seborg and Suh utilizes Pade first order approximation for the delay terms in the closed loop transfer function. In this paper, the use of a Pade second-order approximation method is investigated. The simulation results show that the new method is superior to pervious approaches such as Ziegler-Nichols and Cohen-Coon methods.

• 전자공학회논문지B
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• 제30B권11호
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• pp.27-36
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• 1993

It is well know that the tuning method of Yuwana-Seborg (1982) can not be even applied to the relatively small delay system due to the phase errors from the Pad approximation suh (1984, 85, 86). Jutan and Rodriguez(1984), lee(1989), Chen(1989), Lee and Edgar(1990), etc have been tried to improve it. In this stydy, such recent results and their problems are investigated. A new tuning method by "a frequency scale transformation". which is based on a previous result of Suh(1984). is proposed. It can reduce the magnitude of the phase error significantly.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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• pp.106-108
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• 2005

The calculation of parameters of a process model is modified to find that better sliding mode controller for a process with time delay. A design method by Camacho has such problems as chattering, overshoot due to the Pade approximation errors for the time delay term of the first order model. In this paper, a new design technique for a sliding mode controller is proposed by introducing the modified Pade approximation considering the weight factor. The modified method is expected to provide a more accurate model with better control settings.