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论文类型：期刊论文

发表时间：2022-06-28

发表刊物：控制理论与应用

卷号：35

期号：6

页面范围：822-831

ISSN号：1000-8152

摘要：Aiming at low control accuracy and overshoot oscillation problem of the monitor automatic gauge control (AGC) in hot tandem mill due to time-delay and parameter mismatch problem, firstly, the method of time delay estimation based on the wavelet cross-correlation is proposed to determine the delay step; then, the fractal extrapolation interpolation algorithm is used to give the prediction model considering the time delay, and the vertical scale factor is deduced by using the chaos optimization algorithm; finally, PID controller parameters are optimized by using the ladder type dynamic matrix control (DMC) in order that they are adaptively adjusted according to the different working conditions. Compared with the traditional AGC, Smith-AGC and IFEIP-AGC (improved fracted expolotion prediction, IFEIP), the simulation results show that the proposed method can effectively alleviate control overshoot and oscillation phenomenon of exit strip thickness caused by time delay, and the improved system has better dynamic and static characteristics under the condition of external disturbance and system parameter mismatch.

备注：新增回溯数据