Design method of rolling mill vertical vibration suppression controller based on self-adaptive fuzzy backstepping

Abstract

The invention provides a method for designing a rolling mill vertical vibration suppression controller based on self-adaptive fuzzy backstepping, which comprises the following steps of: firstly, establishing a four-degree-of-freedom mechanical-hydraulic coupling nonlinear model of rolling mill vertical vibration according to a dynamic principle of a rolling mill vibration system; setting the vertical vibration displacement of the working roll of the rolling mill to be close to zero as a control target according to the condition that the vertical vibration of the rolling mill causes the workingroll to jump up and down; and finally, in combination with a nonlinear model of rolling mill vertical vibration, selecting a proper Lyapunov function, solving a virtual controller, an actual controller and an adaptive law which enable V (t) to tend to zero when t tends to be infinite, and finally obtaining the predetermined performance controller design method for suppressing rolling mill vertical vibration. According to the method, the rolling mill vertical vibration nonlinear model more conforming to the actual working condition is established, the characteristic that the servo valve has adead zone and the limitation on roller vibration displacement are considered, the rolling mill vertical vibration suppressor is designed, vertical vibration occurring in the high-speed rolling processis rapidly and actively suppressed, and the stability of the high-speed plate and strip rolling process is guaranteed.

Description

technical field [0001] The invention relates to the technical field of metallurgical rolling control, in particular to a design method of a rolling mill vertical vibration suppression controller based on self-adaptive fuzzy backstepping. Background technique [0002] Vibration perpendicular to the rolling direction, or vertical vibration, often occurs during high-speed rolling of extremely thin strip steel. The vertical vibration of the rolling mill not only affects the dimensional accuracy and surface quality of the strip, but also causes damage to the rolling equipment if it is serious. At present, the emergency measures taken on site for the vertical vibration problem of the rolling mill is to reduce the rolling speed, but reducing the rolling speed affects the production efficiency of the strip, and cannot be used as an effective control measure for the vertical vibration of the rolling mill. Therefore, how to effectively solve the vertical vibration problem in the high...

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Problems solved by technology

In addition, in the actual rolling mill coupling vibration system, it is necessary to limit the roll jump displacement and the dead zone problem of the electro-hydraulic servo valve spool

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