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Multi-time-scale model and stability control method for hot strip rolling thin strip flatness and gauge control system

A stable control method and control system technology, applied in the general control system, control/adjustment system, adaptive control, etc., can solve the problem of difficult to obtain high control performance, unable to meet the high-precision control indicators of strip product shape and thickness Requirements and other issues to achieve the effect of overcoming coupling and external interference, high-precision stable control, and reducing steady-state errors

Active Publication Date: 2018-04-20
AUTOMATION RES & DESIGN INST OF METALLURGICAL IND
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Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-time scale model and a stable control method for the shape and thickness control system of hot continuous rolling thin strips, which solves the problem that the existing control methods cannot meet the requirements of the shape and thickness of strip products in the process of hot continuous rolling of thin or ultra-thin strips. , The problem of high-precision control index requirements for plate thickness
[0006] The technical solution of the present invention is to propose a multi-time scale modeling and stability analysis method for the comprehensive control system of hot continuous rolling thin or ultra-thin strip steel plate thickness, so as to solve the problem that it is difficult to obtain high control performance in existing theories and methods

Method used

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  • Multi-time-scale model and stability control method for hot strip rolling thin strip flatness and gauge control system
  • Multi-time-scale model and stability control method for hot strip rolling thin strip flatness and gauge control system
  • Multi-time-scale model and stability control method for hot strip rolling thin strip flatness and gauge control system

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Embodiment approach

[0042] Adopt the present invention to carry out control to hot continuous rolling thin or ultra-thin strip plate thickness comprehensive control system below, illustrate the implementation method of the present invention, concrete process is as follows:

[0043] Step 1: Stability Analysis of Discrete Linear Singular Perturbation Model for Hot Strip Shape and Thickness

[0044] A four-high hot rolling mill with roll bending is selected as the controlled object, and a discrete-time linear singular perturbation model is established as in formula (1), and the stability analysis of the model is carried out using control law (2). The simulation parameters are shown in Table 1.

[0045] Table 1 Simulation parameters

[0046]

[0047] Use the initial value x(0)=[0.2 0.01 0 1×8 ] T , ε=0.01, carry out the simulation, the response curve of the closed-loop system is as follows figure 1 and 2 .Simulation results show that this model can be asymptotically stable and obtain high con...

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Abstract

The invention relates to a multi-time-scale model and stability control method for a hot strip rolling thin strip flatness and gauge control system, and belongs to the field of ferrous metallurgy control technology. For a hot strip rolling thin or ultra-thin strip flatness and gauge integrated control system, a multi-time-scale modeling and stability analysis method is proposed to solve the problem of difficulty in obtaining high control performance by the existing theories and methods. Singular perturbation techniques are adopted for multi-time-scale modeling, system state variables are decomposed into slow and fast categories, and a discrete time linear singular perturbation model for the hot strip rolling thin or ultra-thin strip flatness and gauge control system is established. Based on this model, a slow state feedback and output integrator combined controller is designed, the theorem of solving the controller gain is deduced using a linear matrix inequality method, and the effectiveness of the method is illustrated by simulation and verification. The advantages are that decoupling of the strip flatness and gauge is unnecessary, the dynamics of the controlled system can be accurately characterized, high-precision control performance indexes of the strip flatness and gauge are gained, and the simulation results show the effectiveness of the method.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy control, and in particular relates to a multi-time scale modeling and stability analysis method for a hot continuous rolling strip shape and thickness control system. It is especially suitable for the shape and thickness control of hot continuous rolling thin plates, especially ultra-thin plates, and can also be used for modeling and control of cold rolling situations and other complex systems. Background technique [0002] Hot rolling thin or ultra-thin strip steel can not only be used as raw material for cold rolling, but also can be directly applied to automobiles, ships, electrical cabinets and containers without cold rolling. At present, the proportion of hot thin strips replacing cold strips in foreign countries is about 20%-40%, such as 30%-40% in the United States, about 27% in Europe, and about 25% in Mexico, and there is a growing trend, but the thickness specifications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 陈金香
Owner AUTOMATION RES & DESIGN INST OF METALLURGICAL IND
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