Process and device for determining the effect of adjustment of final control elements

A method for determining an effect of an adjustment of actuators used in the manufacture of a web of material, which adjusters are partially arranged over a width of the web and influence the properties of the web of material, which method includes the steps of:

• (a) adjusting at least one actuator;
• (b) making a prediction as to the effect of the adjustment of the at least one actuator derived from detection values on the behavior of at least one cross section property of the web upon adjustment of the at least one cross section;
• (c) inputting said prediction into a dynamic model;
• (d) measuring the at least one cross section property of the web before and after adjustment of the at least one actuator in step (a);
• (e) comparing the prediction of the effect of the actuator adjustment made in step (b) with the measured effect in step (c);
• (f) if the results of step (d) do not indicate a predetermined degree of agreement, modifying the detection values to obtain such predetermined degree of agreement between the predicted and the measured effects;
• and
• (g) repeating steps (a) to (f) inputting into the repeated step (b) the detection values modified in the previous step (f).