Induction heating closed loop simulation method based on finite element model and system identification

Abstract

The invention discloses an induction heating closed loop simulation method based on finite element model and system identification. The method adopts ANSYS software to build a billet electromagnetic induction heating finite element model, and the simulation of billet induction heating process is realized through solving the model, thus obtaining the simulation data. The system input and output time history which is obtained through the finite element simulation is used for substituting the experimental data, a least square system identification method is adopted to process the input and output time history, and thus, system response characteristic parameters are obtained; then, a proportion integration differentiation (PID) feedback controller is designed on the basis of the model; and finally, an ansys parameter design language (APDL) is adopted to introduce the PID feedback controller into the finite element model, so the simulation process of an induction heating closed loop system is realized. The method takes the advantages of the induction heating finite element model, realizes the coupling of electromagnetic induction heating and a control system, can greatly improve the simulation precision, and facilitates the advanced performance analysis of induction heating closed loop control.

Description

Technical field [0001] The invention belongs to the field of power electronics applications, and relates to a closed loop simulation method of an electromagnetic induction heating process, in particular a closed loop simulation method of an induction heating process based on a finite element model and system identification. Background technique [0002] Induction heating technology uses electromagnetic fields to generate eddy currents to heat workpieces. Because of its fast heating speed, non-deformation of heated parts, less pollution and low energy consumption, it is widely used in billet forging, rolling, heat treatment and other industrial fields. [0003] After literature search, Zhao Min from Zhejiang University of Technology used ANSYS finite element software to establish a calculation model for finite element simulation of induction heating before forging in his master's thesis "Finite Element Simulation Analysis of 45 Steel Billet Before Forging" (2006.4), and established ...

AI Technical Summary

Problems solved by technology

This method uses the finite element induction heating model and system identification method to directly tune the PID controller to realize the simulation of the closed-loop control of the induction heating temperature, reflecting the coupling effect of the electromagnetic induction heating and the control system, which can greatly improve the simulation accuracy and overcome the existing The heating temperature in the equipment has poor real-time response, and the heating temperature is difficult to control, etc.

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