Optimum Gain Design for Hydraulic Screw-Down AGC
Akira KITAMURA, Kazuo NOSE, Masami KONISHI, Takamasa NAKADA
This paper describes a method how to design optimum control gains for hydraulic screw-down AGC systems. In this method, control algorithm is fixed and just the control gains are optimized. The problems treated here are gaugemeter AGC and absolute AGC which has a zero in its transfer function. Applying the optimum regulator, the Riccati equation with compatibility conditions are analytically solved to find the optimum gains. As a result, these gains are proved to be a function of a plastic coefficient of the rolling material, mill constant and parameters which characterize the dynamic response of the electro-hydraulic mechanism. This method is successfully applied to the AGC for plate rolling mill as a gain optimization system. As a result, the gauge deviation has shown a decrease of 35 % in average, compared with that before application.