基于KPLS和TD的热连轧精轧末架微调AGC

热连轧传统的厚度控制方式主要依靠精轧机组下游机架的监控AGC(automatic gauge control)来消除厚差,易造成末架调节量过大,对板形产生非常不利的影响.为此提出一种基于KPLS(kernel partial least squares)和TD(tracking differentiator)的热连轧精轧末架微调AGC,通过对前一卷带钢轧制信息进行非线性特征抽取,找出F5,F6机架间过程变量的关系,从而可以在F6机架保持辊缝和压力基本不变的前提下,仅通过调节F5机架的辊缝而使厚度精度达到控制要求.现场实验证明了这一观点.

Micro adjustment AGC of last stand in hot finishing mill based on KPLS and TD

Conventional thickness control of hot rolling mainly depends on the monitoring automatic gauge control (AGC) of downstream stands to reduce thickness deviation. This method brings excessive adjustment on the last stand, and has passive effects on profile. In order to alleviate this influence, micro adjustment AGC of last stand in hot finishing mill based on kernel partial least squares (KPLS) and tracking differentiator (TD) is proposed in this paper. It established relations between F5 and F6 stands' process variables through nonlinear feature extraction from rolling information of previous strip. Accordingly, the thickness precision can be reached by regulating the gap of F5 while keeping the F6 gap and force basically constant. Field experiment also proves this idea.