Abstract
In tackling the problem of liquid steel level regulation in the mold of a continuous steel caster, the values of some system parameters, such as the clogging degree and the discharge coefficients of nozzles, are seldom precisely known. The discrete control laws developed in this work employ on-line estimated values of these parameters, to produce a stable regulation of mold and tundish levels for an industrial-type two-strand continuous slab caster. The estimation procedure is delayed by one time step (the sampling time) in order to become realizable; when the sampling time is small enough, the discrete control scheme gives stability and convergence properties that are analogous to those of an ideal control scheme with accurate knowledge of the parameter values.
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