(57) In a method and a corresponding device for the active compensation of periodic disturbances
of known frequency during hot or cold rolling, such as roll eccentricities, by means
of a control system, with the aid of a linear dynamic controller (2) which comprises
a model (Pu) that describes one part of the dynamic behaviour of the controlled system (1), an
output variable (y) is determined from an input variable (u) on the basis of a reference
variable (r), and a compensation signal (uLMS) is generated on the basis of said output variable and a measured output variable
(y) of the controlled system (1) and is impressed on the input variable (u) fed to
the controlled system (1). As a result, the tracking control is decoupled from the
disturbance control, and the controller according to the invention can therefore be
inserted into existing control loops for the thickness of the rolling material and/or
for the position of the rolls and/or for the rolling force and/or for the roll bending.
The compensation signal is generated without prior identification of the eccentricity,
which thus permits a more rapid correction of the disturbances.
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