A Novel Control System Design Framework and its Application to Robust Steel Rolling

Toshio Eisaka


Control system design, robust control, rolling mill, transfer function


A control system design framework based on characteristic transfer functions is presented and applied to robust control of a tandem cold rolling mill. Compared to conventional design scheme such as Q-parameter approach, the proposed one enables numerical optimization with a prescribed order controller. Moreover, multi-objective control problems can be dealt with step-by-step in order of precedence. Namely, various practical control problems can be flexibly considered based on the scheme. We applied this scheme to gage and tension control of a tandem cold mill rolling. Simulation results described that the proposed scheme offers a potential for improvement compared to conventional Invers Linear Quadratic design.

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