Optimization and Innovative Modification of a Model Used to Determine the Amount of Adjustment of an Actuator for Flatness Control

Abstract

Calculation of the amount of adjustment of an actuator is an important step in flatness control during the cold rolling process. It has a direct effect on the precision with which flatness of strip is controlled. In this paper, an optimal evaluation function for evaluating actuator adjustment is defined based on the efficiency of the actuator and is solved by using a feasible-directions algorithm. This approach can not only determine the amount of adjustment that is optimal but also eliminates the problems associated with irreversible iteration in the traditional method. The software package Visual Studio is used to perform graphical modeling and a function block generator is used to create an optimum function block. The proposed model has been tested on a five-stand tandem cold-rolling mill. The results show that the flatness control deviation is reduced from 9% to 5%, which demonstrates that the model is highly effective.