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관측기 모델 선정을 통한 모델 불확실성을 갖는 선형 시불변 시스템 강인 안정화
오상록(Sangrok Oh),김정수(Jung-Su Kim),심형보(Hyungbo Shim) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.8
This paper presents a robust observer?based output feedback control for stabilization of linear time invariant systems with polytopic uncertainties. To this end, this paper not only finds a robust observer gain but also suggests how to determine the model used in the observer, which is not obvious due to model uncertainties in the conventional observer design method. The robust observer gain and the observer model are selected in a way that the whole closed-loop is stable by solving LMIs and BMIs (Linear Matrix Inequalities and Bilinear Matrix Inequalities). A simulation example shows that the proposed robust observer-based output feedback control successfully leads to closed-loop stability.
오상록(SangLok Oh),이갑조(Gab-jo Lee),김종관(Jong-Kwan Kim) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
The dimensions and forms of precise machined parts are different to kinds of machine. It will be variant according to machine wear, tool form, cutting method and cutting condition at the same machine. At that time, the most important things are controlled and measured by appropriate measuring instruments. This paper aims to contribute to improving measurement accuracy through evaluation and consideration about various roundness in the machining company.
오상록(Sang-Lok Oh),진도훈(Do-Hun Chin),윤문철(Moon-Chul Yoon),류인일(In-Il Ryoo),하만경(Man-Kyung Ha) 한국생산제조학회 2005 한국생산제조학회지 Vol.14 No.5
This paper presents several time series methods to analyze the chatter mechanics by using the power spectrum of these algorithms considering the cutting dynamics. In this study, several time series models such as AR(burg, forward-backward, geometric lattice, instrument variable, least square, Yule Walker), ARX(ls, iv4), ARMAX, ARMA, Box Jenkins, Output Error were modeled and compared with one another. Finally, it was proven that time series modelings are also a desirable and reliable algorithm than the other conventional methods(FFT) for the calculation of the chatter mode in turning operation. Also, the spectrum of times series methods is a little bit more powerful than the FFT for the detection of a high noisy and weak chatter mode. The radial cutting force Fy has been used for spectrum and chatter stability lobe analysis in this study.