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박철재(Cheol Jae Park) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.2
This paper proposes a cooling stop temperature control(CSTC) concept which aims at obtaining the uniform temperature and quality of the material along the longitudinal and lateral direction of the strip. The CSTC is designed using the experimental CCT(Continuous Cooling Transformation), TTT(Time Temperature Transformation) curves and the temperature control model by the heat transfer governing equation, and the temperature control simulator. The cooling pattern and the rolling speed can be solved by the CSTC. It is shown through the field test of the hot strip mill of POSCO that the phase transformation ratio of the high carbon steel is considerably improved by the proposed temperature control.
열연 고강도강의 비정상부 온도제어를 위한 LBCC 개발
박철재(Cheol Jae Park),윤강섭(Kang Sup Yoon) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.4
In this paper, a LBCC (Latter Bank Cooling Control) for the high strength steel is proposed to obtain the desirable temperature and the property of the rnaterial along the longitudinal direction of the steel on the ROT (Run-Out Table) process A cooling valve is modeled to analyze the response of the ROT banks. The control concept is derived from a field data, a valve model considering the valve response and a TTT (Time-Temperature Transformation) diagram. The propæed control is verified from the simulation results under the various carbon quantities. 1t is shown through the field test of the hot strip mill that the deviation of the CT (Coiling Temperature) is considerably decreased by the proposed temperature control.
CCD 폭 측정 시스템 및 퍼지 PID를 이용한 CFWC 제어기 설계
박철재(Cheol Jae Park) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.11
In this paper, we propose a CFWC (CCD and fuzzy PID based width control) scheme to obtain the desired delivery width margin of a vertical rolling mill in hot strip process. A WMS(width measurement system) is composed of two line scan cameras, an edge detection algorithm, a glitch filter, and so on. A dynamic model of the mill is derived from a gauge meter equation in order to design the fuzzy PID controller. The controller is a self-learning structure to select the PID gains from the error and error rate of the width margin. The effectiveness of the proposed CFWC is verified from simulation results under a width disturbance of the entry in the mill. Using a field test, we show that the performance of the width control is improved by the proposed control scheme.
박철재(Cheol Jae Park) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.8
본 논문에서는 배치식 살균기의 문제점을 분석하여 연속 살균기를 모델링하고 설계하였으며 온도편차를 제어하였다. 살균기의 노즐 직경, 홀 직경, 노즐 길이 등의 설계 파라미터를 이용하여 온도를 해석하였다. 살균기의 온도편차에 중요한 노즐 직경, 제트박스의 직경, 노즐의 홀 피치 등의 설계 파라미터를 반응표면분석법에 의하여 최적화하였다. 그리고 본 연구에서 제안한 설계 파라미터를 이용하여 살균기의 실험장치를 개발하여 온라인으로 테스트를 실시하였다. 온라인 테스트 결과 목표온도까지 상승하는데 약 7.3 min 소요되었고 온도편차는 약 0.84℃로 양호하였으며 해석적으로 최적화를 실시한 결과와 동일한 최적조건을 도출하였다. In this paper, we analyzed the problems of a batch-type sterilizer and design a continuous sterilizer to control the temperature deviation. The temperature deviation is analyzed with respect to design parameters such as a nozzle diameter, hole diameter, and nozzle length. The significant temperature parameters are optimized using the response surface methodology. An experimental apparatus is developed using the optimized design parameters. Using a field test, we show that the target temperature is obtained in about 7.3 minutes and the temperature deviation is improved about 0.84℃. The optimized parameters from the test are equal to the analytical parameters.
측정지연이 있는 ROT 공정의 외란제거를 위한 SPDR 제어기 설계
박철재(Cheol Jae Park) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.10
In this paper, we propose an SPDR (Smith Predictor for Disturbance Reduction) scheme to improve the temperature control by reduction of the disturbance in ROT process with measurement delay. The proposed controller is a combination of Astrom’s modified Smith predictor with a disturbance reduction controller and a grey predictor. The grey prediction is used to calculate the inverse of the measurement delay and to predict future variations and tendencies of system output. The simulation results demonstrate the successful performance of the proposed disturbance reduction controller and enhance the robustness of the proposed control scheme.
박철재(Cheol Jae Park) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.3
In this paper, a new looper controller is proposed to minimize the tension variation of a strip in the hot strip finishing mill. The proposed control technology is based on a receding horizon control (RHC) to satisfy the constraints on the control input/state variables. The finite terminal weighting matrix is used instead of the terminal equality constraint. The closed loop stability of the RHC for the looper system is analyzed to guarantee the monotonicity of the optimal cost. Furthermore, the RHC is combined with a 4SID(Subspace-based State Space System Identification) model identifier to improve the robustness for the parameter variation and the disturbance of an actuator. As a result, it is shown through a computer simulation that the proposed control scheme satisfies the given constraints on the control inputs and states: roll speed, looper current, unit tension, and looper angle. The control scheme also diminishes the tension variation for the parameter variation and the disturbance as well.