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

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...

AI Technical Summary

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

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