Adaptive control for the head-end strip gauge using recursive least squares at hot strip mill

Gauge control using an interstand thickness gauge is an important strip gauge control in a hot strip mill. This method measures the interstand thickness deviation by interstand gauge when the head-end strip passes the interstand thickness gauge, predicts thickness deviations that will be occur in following stands, and adjusts the roll gaps according to predicted gauge deviation. Although the effect is depends on that prediction accuracy, the current method does not have the adaptive control and thus is unable to compensate for gauge deviation caused by circumstance change. This paper proposes the adaptive control using recursive least squares for prediction of thickness deviation. The effects of the proposed algorithm are verified using computer simulations