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Plate model prediction control method

A technology of model predictive control and plate shape, applied in the direction of contour control, etc.

Active Publication Date: 2015-04-22
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is: aiming at the above-mentioned deficiencies in the prior art, propose a flatness flatness model predictive control method that can effectively solve the problem of control lag when the running speed of the strip steel is low, so as to serve as the basis of the existing flatness feedback control Supplementary, to create more favorable conditions to ensure the quality of cold-rolled strip steel

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Embodiment Construction

[0057] The shape control system of this embodiment is as follows: figure 1 As shown, it mainly includes a rolling control computer 1 whose control output terminals are respectively connected to each roll through an interface unit, and a shape meter 2 whose signal output terminals are connected to corresponding ports of the rolling control computer. The detection mechanism in the shape meter 2 has a distance of 1 = 3.2m from the exit of the 5# frame (also referred to as 5 frame) to the shape measurement roller. When the strip running speed V figure 2 ):

[0058] The first step is to use the least square method to regress the quadratic curve on a set of standard measured flatness data collected by the flatness meter to obtain the quadratic flatness component in the actual flatness curve (that is, the quadratic term coefficient A 2 ——reflects the symmetrical shape) and the first-order shape component (namely, the first-order coefficient A 1 ——reflecting asymmetric plate shape),...

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Abstract

The invention relates to a plate model prediction control method and belongs to the technical field of steel rolling quality control. The plate model prediction control method includes: when a rolling control computer detects that a band steel speed is lower than a preset value, taking a secondary plate shape component and a first plate shape component in an actual plate shape curve as target values of model parameter optimization; obtaining a static secondary plate shape component, a static first plate shape component, a dynamic secondary plate shape component and a dynamic first plate shape component according to a static prediction model and a dynamic prediction model; after the static secondary plate shape component and the static first plate shape component are taken as control initial values, respectively comparing the dynamic secondary plate shape component and the dynamic first plate shape component with the corresponding target values, and outputting corresponding control parameters according to comparing results. Reasonable prediction parameters are adopted to substitute for actual measuring parameters for comparison and control, so that control hysteresis when the band steel rotating speed is low can be avoided, existing plate shape feedback control can be supplemented, and cold rolling quality is guaranteed.

Description

technical field [0001] The invention relates to a method for steel rolling quality control, in particular to a plate shape model predictive control method, which belongs to the technical field of steel rolling quality control. Background technique [0002] The shape of cold-rolled strip directly affects the productivity, yield and cost of downstream industries, as well as the appearance of products. Therefore, shape control is of great significance for improving the quality of cold-rolled strip. [0003] The shape of the strip includes two dimension indicators, vertical and horizontal. As far as the longitudinal direction of the strip is concerned, the shape usually refers to the flatness, commonly known as wave shape, that is, the flatness along the length direction of the strip; Generally speaking, the strip shape refers to the cross-sectional shape of the strip, that is, the thickness distribution in the width direction of the strip, and the convexity is the most commonly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/28
Inventor 严加根顾廷权王金华刘华缪明华尤仁美陈宗仁汤红生
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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