퍼지-PI 스미스 제어를 이용한 냉간 연속 압연기의 자동두께제어에 대한 연구

Abstract

In this thesis, a fuzzy-PI smith controller is proposed for Automatic Gauge Control in a 5-stand tandem cold rolling mill. The controller is basically comprised of smith predictive control, fuzzy control, and PI control. The smithpredictive control method is used to eliminate the time delay element generated by thickness measurement which is installed far away from the mill stand. Furthermore, the fuzzy control scheme is exploited to tune the parametersof PI controller automatically. The verification of control performance for the fuzzy-PI smith controller is conducted by using Hardware-In-the-Loop Simulator. The simulation results show that the proposed controller yields smallerundershoot, faster settling time, stronger robustness, and higher control accuracy compared to Monitor AGC and Mass Flow AGC which are widely and currently used in the steel industry.