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엄혁,이진걸,양순용,김승수 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.4
In order to meet the requirement for higher thickness accuracy in tandem cold rolling processes, it is strongly necessary to have good performance in control units. To meet this requirement, this paper suggested an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills. Considering entry thickness variation and roll eccentricity simultaneously as the major disturbances, a synthesis of multivariable control systems was presented based on control theory, which could reflect the knowledge of input direction and spectrum of disturbance signals on design. Then, to effectively reject roll eccentricity, a weight function having some poles on the imaginary axis was introduced. This lead to a non-standard control problem, and the design procedures for solving this problem were analytically presented. The effectiveness of the proposed control method was evaluated through computer simulations and compared to that of the conventional linear quardratic control and feedforward control methods for roll eccentricity.
엄혁,최종환,양순용,이진걸,김승수 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.4
In this paper, the dynamic stability of a hydraulic excavator using ZMP concept is considered. When a load is moved in an excavator based on automation, an excavator often loses the stability and falls over. This is because a dynamic element is not included in the moment equilibrium equation that is used in order to judge a reversal. Consequently, reversal distinction algorithm including all a static and a dynamic element along a load movement in crane work is necessary. Zero Moment Point(ZMP) is a point on the floor where the resultant moment of the gravity, the inertial force of the manipulator and the external force is zero. This study is going to interpret the reversal stability of the excavator to which is applied ZMP concept through simulation.
엄혁,최종환,김승수,양순용,이진걸 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4
In this paper, the dynamic stability of a hydraulic excavator using ZMP concept is considered. When a load is moved in an excavator based on automation, an excavator often loses the stability and falls over. This is because a dynamic element is not included in the moment equilibrium equation that is used in order to judge a reversal. Consequently, reversal distinction algorithm including all a static and a dynamic element along a load movement in crane work is necessary. Zero Moment Point(ZMP) is a point on the floor where the resultant moment of the gravity, the inertial force of the manipulator and the external force is zero. This study is going to interpret the reversal stability of the excavator to which is applied ZMP concept through simulation.
신세대의 삶과 의식구조 : 진지하지 않은 역사가 만들어내는 혼돈
엄혁 창원대학교 학생생활연구소 1995 학생생활연구 Vol.8 No.-
일상의 환경과 삶의 조건에 의해 사람들의 감수성과 이미지는 만들어진다. 또한 정치, 경제, 예술 등 사회적 조건과 문화적 환경에 의해 사람들의 의식과 무의식은 형성된다. 그렇기 때문에 사람들의 감수성과 이미지를 연구한다는 것은 일상의 환경과 삶의 조건을 연구한다는 것이며 사람들의 의식과 무의식에 대한 관심은 사회적 조건과 문화적 환경의 관심을 의미하는 것이다.
Design of H∞ Control System for Tandem Cold Mills
Um, Hyuk,Kim, Seung-Soo,Yang, Soon-Yong,Lee, Jin-Gul 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.4
In order to meet the requirement for higher thickness accuracy in tandem cold rolling processes, it is strongly necessary to have good performance in control units. To meet this requirement, this paper suggested an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills. Considering entry thickness variation and roll eccentricity simultaneously as the major disturbances, a synthesis of multivariable control systems was presented based on H∞ control theory, which could reflect the knowledge of input direction and spectrum of disturbance signals on design. Then, to effectively reject roll eccentricity, a weight function having some poles on the imaginary axis was introduced. This lead to a non-standard H∞ control problem, and the design procedures for solving this problem were analytically presented. The effectiveness of the proposed control method was evaluated through computer simulations and compared to that of the conventional linear quardratic control and feedforward control methods for roll eccentricity.
최종환,엄혁,임태형,김승수,양순용,이병룡,안경관 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
The hydraulic excavator has been a popular research object for automation because of its multi-workings and economic efficiency. When it works crane tasks, most of disasters happen. The stability of the excavator having crane function has a close relation with excavator's posture, motion and load. In this paper, the stability of tipping-over has been analysed using Zero Moment Point(ZMP),