Thesis (M.Sc.)-Cairo nivsersity,2022.

Bibliography: p.

The looper control of hot strip finishing mill is one of the most critical control items in hot strip rolling mill process. It is a highly complex nonlinear system, with strong states coupling and uncertainty that present a difficult control challenge. Loopers are placed between finishing mill stands not only to control the mass flow of the two stands but also to generate a constant specific strip tension during rolling, independent of the actual strip stock which influences the width of the strip. some of the applicable control architectures for the finishing mill are reviewed. Two general approaches are considered, the first is based on a loop or SISO (single input single output) strategy, while the second is based on a MIMO strategy:
In the loop approach, two different schemes are considered with distinct loop configuration. For both schemes, PID and fuzzy-PID are considered for comparison purpose.
Since in the second scheme the most important loop is the looper control loop, it is investigated whether a nonlinear sliding mode control can significantly improve the response.
In the multi variable or MIMO approach, standard LQR (linear quadratic regulator) is investigated after linearization of the system

يعتبر النحكم في الشد في خطوط الدرفلة علي الساخن من اعقد انظمة التحكم عمليا لكونه غير خطي , متعدد الابعاد , مقترن بمتغيرات الحالة ويحتوي علي كثير من معاملات غير مؤمكدة القيم. ويمثل ال looper الاداة الرئيسية للتحكم في تدفق خام الحديد وكذلك الشد به حيث يؤثر على سمك المنتج . يكون ال looper مثبتا بين قائمين (stands) في خط الدرفلة النهائي . تقوم الرسالة بعرض طرق التحكم المختلفة في منظومة التحكم المذكورة ويتم المقارنة بينها للوصول الى افضلها ومجال تطبيقها.

Issues also as CD.

Text in English and abstract in Arabic & English.