Continuous casting machine mold bath surface level control method

摘要

PROBLEM TO BE SOLVED: To enable the holding of effective control by instantially following to the frequency even if the frequency of variation of bulging molten metal surface varies with casting speed. ;SOLUTION: The control method of the molten metal surface level in a mold for continuous casting machine is executed by executing a control calculation based on the molten metal 2 surface level in the mold 5 in the continuous casting machine and the setting molten metal surface level and using a gain scheduling controller obtd. with the result in a convex optimization problem under constraining condition to a linear matrix inequality as a control device 9 for outputting opening degree command of a sliding nozzle to a sliding nozzle controller 8 so that the molten metal surface level becomes the constant. The bulging frequency as the frequency in the variation of the bulging molten metal surface is followingly detected by executing an on-line frequency analysis to the molten metal surface level signal continuously detected, and based on this detected result, a parameter in the gain scheduling controller is continuously changed.;COPYRIGHT: (C)1999,JPO