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손명공(Myung-Gong Sohn),손천돈(Cheon Don Son),김구화(Goohwa Kim),이덕만(Duk-Man Lee),권성하(Sung-Ha Kwon),정은태(Eun Tae Jeung) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.2
This paper presents a control method to maintain stable mold level for unsteady bulging in high speed casting. The stabilizing mold level is an important factor to get high quality products. But, for various reasons, there are several disturbance factors which make mold level unstable. Bulging is one of disturbance factors and considered for the current stage of study. We design a disturbance observer to attenuate the effect of bulging which is periodic mold level disturbance. Since the period of bulging varies with the casting speed, the parameters of disturbance observer are changed by the casting speed. Simulation is illustrated to demonstrate stable performance of the proposed method in comparison with a previous method in a variable operating frequency.
T-S fuzzy 모델을 이용한 비선형 시스템의 tracking 제어에 관한 연구
손명공(Myung-Gong Shon),성동한(DongHan Seong),손천돈(Cheon Don Son),정은태(Eun Tae Jeung),권성하(Sung-Ha Kwon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper deals with a tracking problem for nonlinear systems using its T-S fuzzy model and internal model. We extend the internal model of linear systems to an internal model of T-S fuzzy systems to accompany with state error of zero. A sufficient condition of the existence of a tracking controller for T-S fuzzy systems is expressed by linear matrix inequalities. A system of inverted pendulum on cart is illustrated to verify our method.