Abstract
The design and application of a multivariable control in the hot strip mill looper is mentioned in the paper. Basic equations of looper motion are derived in connection with rolling conditions. Optimized multivariable control, decoupling the mutual interactions in the looper, is demonstrated on the actual production mill. The performance is much superior to those with conventional methods. Under the ordinary rolling conditions the looper position variation is reduced to 1-2 degree and the interstand tension variation is negligibly small. The feasibility of supplement compensation of derivative action is investigated, simulation study proved further possibilities of the looper control.
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