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Dynamic Temperature Control with Variable Heat Flux for High Strength Steel
박철재 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.3
We propose a dynamic temperature control (DTC) scheme for high strength steel to obtain the desired temperature and properties of steel in the run-out table (ROT) process. A control model with variable heat flux is developed to reduce the temperature deviation from the actual temperature of the strip, the temperature drop due to water cooling. The control concept uses field data and a time-temperature transformation (TTT) diagram. A ROT dynamic simulator (RoDys) with four simulation modes using the control model is developed to achieve the desired steel properties. The effectiveness of the proposed control scheme is verified from simulation results under a disturbance of the rolling speed. Using a hot strip mill field test, we show that the performance of the temperature control is sig-nificantly improved by the proposed control scheme.
소둔산세 공정의 사행제어기 개발 및 측정지연 보상에 관한 연구
박철재 제어·로봇·시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.12
In this paper, we propose a control technology to prevent and reduce the center position error in the annealing and pickling process. A coupling control is developed to solve the problem of independent control using individual sensors. We design a receding horizon controller (RHC) to reduce the error and consider the limiting conditions of control input and state variables based on actual data. We also design a filtered predictive PI (FPPI) controller structure to reduce the measurement delay problem, disturbance and modeling error at high frequencies. The simulation results demonstrate the successful performance of the command following and the disturbance reduction by the proposed control scheme. .