Patent ID: 8255074

Claim:
An operating method for a determining device attached to a rolling mill, wherein during operation of the rolling mill, a rolling stock running through the rolling mill is machined by means of a machining device, and the machining device is controlled by means of a controller, the method comprising: generating a time profile of a pre-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location upstream of the machining device, as the rolling stock runs through the rolling mill, generating a time profile of a post-machining variable of the rolling stock based on a series of measurements of the rolling stock over time at a location downstream of the machining device, as the rolling stock runs through the rolling mill, calculating a time-based variance of the pre-machining variable time profile representing the variability of the pre-machining variable over time, calculating a time-based variance of the post-machining variable time profile representing the variability of the post-machining variable over time, calculating a controller characteristic based on (a) the time-based variance of the pre-machining variable time profile and (b) the time-based variance of the post-machining variable time profile, the controller characteristic being configured for reducing a subsequently calculated time-based variance of the post-machining variable time profile, using at least the setpoint variable and the calculated controller characteristic to determine a manipulated variable for the machining device, outputting the manipulated variable to the machining device, and adjusting the machining of the rolling stock by the machining device in accordance with the manipulated variable output to said machining device.