Fuzzy PID temperature adjusting method for steel billet reheating in strip steel hot continuous rolling production

Abstract

The invention provides a strip steel hot continuous rolling production billet reheating fuzzy PID temperature adjusting method and belongs to the field of strip steel hot continuous rolling production. The method comprises the following steps of performing T-S fuzzy partial differential equation modeling on a nonlinear billet internal temperature evolution dynamic model with spatial and temporal distribution characteristics to obtain a T-S fuzzy partial differential equation model of nonlinear billet internal temperature evolution dynamic; constructing a T-S fuzzy observer according to the T-S fuzzy partial differential equation model by adopting an observer-based feedback control technology; constructing a fuzzy PID temperature measurement tracking regulator based on a T-S fuzzy observer by applying a PID control strategy; and determining control parameters of the fuzzy PID temperature measurement tracking regulator, applying the fuzzy PID temperature measurement tracking regulator to the nonlinear billet internal temperature evolution dynamic model, and driving the billet lower surface temperature to be regulated to an expected temperature value. According to the method, non-intrusive steel billet temperature surface measurement and adjustment can be realized, so the lower surface temperature of the steel billet reaches an expected temperature value.

Description

technical field [0001] The invention relates to the field of strip steel hot continuous rolling production, in particular to a fuzzy PID temperature adjustment method for steel billet reheating produced by strip steel hot continuous rolling. Background technique [0002] In the hot strip rolling production process (strip hot rolling production process such as figure 1 As shown), precise temperature control is conducive to the industrial upgrading of the steel industry: energy saving, emission reduction and quality improvement. This is because energy consumption and steel product quality in hot rolling are closely related to temperature. Therefore, it is studied how to develop a simple, effective and reliable control algorithm to drive the heating unit to achieve the desired temperature distribution of the billet (the schematic diagram of billet reheating is shown in Fig. figure 2 shown), which has important practical application value for the industrial upgrading of the s...

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Problems solved by technology

[0005] Although PID control is widely used in the industrial field and has become one of the effective ways to solve the tracking control problem, the problem of billet surface temperature regulation is essentially a quasi-linear distributed parameter system boundary output tracking control problem

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