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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.