método de controle para o menisco de um molde de fundição contínua

The control method for the meniscus of a continuous casting mold, comprises adjusting the inflow of liquid metal into a continuous casting mold by a closure device and withdrawing the partially solidified metal strand from the continuous casting mold by a withdrawal device. A measured actual value of the meniscus is fed to a meniscus controller, which determines a target position for the closure device on the basis of the actual value and a corresponding target value. The measured actual value is fed to a disturbance variable compensator. The control method for the meniscus of a continuous casting mold, comprises adjusting the inflow of liquid metal into a continuous casting mold by a closure device and withdrawing the partially solidified metal strand from the continuous casting mold by a withdrawal device. A measured actual value of the meniscus is fed to a meniscus controller, which determines a target position for the closure device on the basis of the actual value and a corresponding target value. The measured actual value is fed to a disturbance variable compensator. The target position for the closure device, or a target position corrected by a disturbance variable compensation value, or a corresponding actual value are further fed to the disturbance variable compensator. The disturbance variable compensator determines the disturbance variable compensation value. The corrected target position is fed to the closure device. The disturbance variable compensator comprises a model (21) of the continuous casting mold by means of which it determines an expected value for the meniscus on the basis of a model input value. The disturbance variable compensator further comprises a number of oscillating compensators (23) by means of which a frequency disturbance proportion is determined on the basis of the difference between the actual value und the expected value, each relative to a related disturbance frequency. The sum of the frequency disturbance proportions corresponds to the disturbance variable compensation value. The model input value is determined by the relation of i=p'+z1, where p' is the uncorrected target or actual position of the closure device and z' is a jump compensation value. The disturbance variable compensator comprises a jump determiner (22), by means of which it determines the jump compensation value by integrating the difference. The model of the continuous casting mold consists of a series connection of model integrator with a model dela