Anti-disturbance control method of rolling mill vertical reduction system under typical working conditions

Abstract

The invention discloses an anti-disturbance control method for the vertical reduction system of a rolling mill under typical working conditions. In consideration of the unknown model parameters and the execution dead zone of the servo valve, an adaptive parameter estimation and inversion method using an exponential reaching law is used. The anti-disturbance controller combined with step control method splits the dead zone into a linear function and a piecewise function, and derives an anti-disturbance controller that can cope with unknown system structural parameters and unknown asymmetric dead zones; the simulation shows that the controller While ensuring the closed-loop stability of the system, it can effectively suppress the disturbance caused by sudden load changes in the rolling process to the rolling mill reduction system, which is of great significance to the high-precision rolling of plates and strips.

Description

technical field [0001] The invention relates to the field of rolling mill control, which considers the nonlinearity of the rolling mill system containing servo valves, and conducts control technology research on the nonlinear rolling mill system, and particularly relates to a rolling mill vertical under typical working conditions where the model parameters are unknown and the servo valve execution dead zone is considered. The anti-disturbance control method of the depression system. Background technique [0002] The patent of this invention studies the special steel tandem cold rolling mill system. Due to the continuous improvement of the quality requirements of the special steel in the development of advanced manufacturing industry, various disturbances in the rolling working environment will cause the strip to vibrate just now and appear vibration marks. The scratches seriously affect the quality of the board. However, conventional control methods use hydraulic cylinders ...

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Problems solved by technology

[0002] The patent of this invention studies the special steel tandem cold rolling mill system. Due to the continuous improvement of the quality requirements of the special steel in the development of advanced manufacturing industry, various disturbances in the rolling working environment will cause the strip to vibrate just now and appear vibration marks. Stains seriously affect the quality of the board

However, conventional control methods use hydraulic cylinders to suppress disturbances, and mostly treat hydraulic cylinders as a first-order or second-order linear link. The modeling of the rolling mill system is usually linearized, which was satisfied in the previous production. application requirements, but a series of plans proposed in recent years have increasingly increased the precision requirements of steel, and the original control method has been unable to meet the development of advanced manufacturing industries.

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