Method for suppressing the influence of roll eccentricities on a control for a rolling-stock thickness in a roll stand

US5647238A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Siegbert Steidl · Herzogenaurach, DE
• Clemens Jungkunz · Erlangen, DE
• Klaus Berger · Pocking, DE

Key dates

• Filing date: Mar 27, 1995
• Grant date: Jul 15, 1997
• Expiry date: Mar 27, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G05D5/03
• WIPO field: Control
• WIPO sector: Instruments

Abstract

To suppress the influence of roll eccentricities on a feedback control of a rolling-stock thickness in the thickness control, it is generally known to provide an insensitive dead zone for signal fluctuations caused by the roll eccentricities, and for the zone width of this insensitive dead zone to be varied relative to the magnitude of the signal fluctuations. To prevent actual thickness fluctuation in the rolling stock from leading to a widening of the dead zone, it is provided for the signal fluctuations drawn upon to vary the zone width (x) to be filtered by one or more band-pass filters (26, 27), whose mid-frequencies correspond to the fundamental frequency (.omega.) and, in some instances, to the first or further harmonic component frequencies (2.omega.) of the roll eccentricities (.DELTA.R).