Non-linear control in rolling mills: A new perspective

被引:0
作者
Kugi, A [1 ]
Novak, R [1 ]
Schlacher, K [1 ]
机构
[1] Dept Automat Control, A-4040 Linz, Austria
来源
IAS 2000 - CONFERENCE RECORD OF THE 2000 IEEE INDUSTRY APPLICATIONS CONFERENCE, VOLS 1-5 | 2000年
关键词
rolling mill; hydraulic positioning system; non-linear control; thickness control; hydraulic gap control;
D O I
暂无
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
This paper is concerned with the application of modern non-linear control techniques to the thickness control in rolling mills. It turns out that the performance of the closed loop can be significantly improved by taking into account the essential non-linearities of the to-be-controlled plant already in the controller design. These non-linear control strategies totally differ from the common approach of linearizing the non-linear system around a nominal operating point because, they are not limited to a more or less small neighborhood of the operating point, but are valid all over the operating range. Practically, these non-linear control concepts are a possible answer to the trend of modern rolling mills towards tighter thickness tolerances, thinner final strip thicknesses, faster production rates and shorter off-gauge lengths. However, a straight forward application of the well established non-linear control theory does not always lead to a control concept that is practically feasible. It is rather unavoidable to consider all the special features and properties of the plant. By means of the gap control of a mill stand with a hydraulic positioning system we will show in detail the advantages of a non-linear control approach. Finally, simulation and measurement results will demonstrate the feasibility and the excellent performance of the proposed design.
引用
收藏
页码:2613 / 2620
页数:8
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