Rolling mill main transmission system output feedback control method considering input limitation

Abstract

The invention discloses a rolling mill main transmission system output feedback control method considering input limitation. The method comprises the following steps that S1, establishing a kinetic model of a rolling mill main transmission system; S2, designing a high-gain extended state observer, and obtaining estimated values of a system state and total disturbance; S3, introducing a performancefunction, and constraining transient and steady-state performances of a rolling mill rotating speed tracking error; and S4, according to the estimated values of the system state and the total disturbance obtained in the step S2, formulating an output feedback control strategy for the rolling mill main transmission system constrained by the performance function, and under the condition that inputis limited, converging the roller rotating speed tracking error into a preset area. According to the method, the transient performance of the system can be optimized, the convergence rate can be increased, the steady-state performance of the system can be guaranteed, the control precision can be improved, through the design of an observer, interference accurate estimation and compensation under the output feedback meaning are achieved, and the robustness of the whole system is improved.

Description

technical field [0001] The invention relates to the control field of a rolling mill system, in particular to an output feedback control method of a main drive system of a rolling mill considering input constraints. Background technique [0002] Cold-rolled sheet has a wide range of applications in the industrial field. With the development of society and the continuous improvement of manufacturing level, the demand for high-quality sheet based on high-speed, high-precision rolling process is also increasing. The main transmission system of the rolling mill is a complex mechanical dynamic structure elastically connected by multi-mass bodies. During the rolling process, the high nonlinearity of the rolling mill system and the influence of external disturbances will cause the entire main transmission system to be in an unstable state, which is very easy to Causes the torsional vibration of the rolling mill. The torsional vibration of the rolling mill will greatly affect the qu...

AI Technical Summary

Problems solved by technology

If the input saturation problem is not considered and the input exceeds the range that the motor can withstand, it may cause the motor to fail or even be damaged, and then the closed-loop system will become unstable.

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