Cold-rolling mill second flow thickness control method and device based on fuzzy control

Abstract

The invention relates to a cold-rolling mill second flow thickness control method and device based on fuzzy control. The method comprises the steps that the thickness of a strip steel outlet is pre-calculated according to a second flow equation, and an outlet thickness gauge is used for measuring the thickness and correcting the thickness to obtain an outlet thickness difference; the outlet thickness difference is divided into a plurality of fuzzy grades, and a subordinating degree value of the outlet thickness difference is obtained; and a fuzzy rule is determined, proportional and integral control output control amounts are calculated according to the fuzzy rule and the membership degree value, and the total output control amount is calculated according to the proportional and integral control output control amounts. According to the cold-rolling mill second flow thickness control method and device, the thickness of the strip steel outlet is firstly pre-calculated according to the second flow equation, and the outlet thickness gauge is used for measuring the thickness and correcting the thickness to obtain the outlet thickness difference; then the outlet thickness difference is divided into the multiple fuzzy grades, and a Gaussian subordinating degree function is used for obtaining the subordinating degree value; the fuzzy rule and the adaptive coefficient are set, and the control amounts of proportional control and integral control are respectively obtained; and finally the second flow AGC control amount is synthesized.

Description

technical field [0001] The invention relates to the technical field of steel rolling control, in particular to a fuzzy control-based method and device for controlling the second flow thickness of a cold rolling mill. Background technique [0002] The thickness control system of a single-stand reversing cold rolling mill generally includes three automatic gauge control methods: feedforward, second flow, and monitoring. Among them, the second flow AGC is the main method of feedback control. The second flow AGC is based on the law of second flow identity in the deformation zone, which means that the mass flow of the metal before and after the frame is constant, and because the width of the strip steel before and after the frame is basically the same, then The speed and thickness of the strip before and after the frame maintain a strict proportional relationship, namely: [0003] V en × h en =V ex × h ex [0004] where V en -Strip inlet speed; V ex - strip exit speed; h ...

AI Technical Summary

Problems solved by technology

[0007] At present, the second-flow AGC method practical in industry generally calculates the adjustment amount of the roll gap through proportional integral (PI) control. As we all know, the selection of proportional-integral parameters has a great influence on the control performance of PI control, and the second-flow AGC control usually only uses one or two A set of fixed control parameters, or the operator will manually input a set of control parameters when rolling a certain steel grade based on experience, and basically does not have the ability to dynamically adjust. Can not achieve better control effect when large

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