Study On Numerical Simulation Of Microwave Heating And Temperature Control

Microwave heating is considered to be an important discovery in the history of scientific research.It has been widely used in production and life fields such as food processing,ceramic sintering,metal smelting,waste treatment and tumor treatment,which has brought huge benefits to society.However,the existence of uniform heating of the medium,local hot spots and thermal runaway are still important problems restricting the further development of microwave heating.Especially in industrial applications,microwave heating equipment usually has multiple microwave source feeders due to power reasons.Therefore,it is of great significance to analyze the thermal performance of multi-feeder microwave heating equipment and implement accurate and efficient feedback control of the media process temperature.Microwave heating technology is an interdisciplinary subject,involving microwave electromagnetic fields,heating medium temperature fields,material property analysis,and control system design based on the principle of automatic control.This paper studies the heating uniformity and temperature control of a high-power multifeeder microwave heating device.The main research contents include: device thermal performance numerical simulation,control system design,system simplified model identification,and ANFIS control strategy simulation and experimental analysis.First,in the thermal analysis section of the device.A 1/2 full-size finite element model was constructed based on COMSOL and verified by experiments,which proved the effectiveness of the model.Based on this verification model,the effect of the number of feed ports on the heating uniformity of the medium and the temperature rise characteristics of the local temperature measurement points were analyzed.The temperature rise characteristics of the local temperature measurement points were also verified by experiments.Secondly,a temperature control system for multi-inlet microwave heating process and a human-computer interaction interface were designed.Based on the autoregressive ergodic(ARX)model,the black box model of the system was identified and the simplified transfer function of the system was obtained..Finally,the simulation and experimental analysis of ANFIS control strategy.Based on the simplified transfer function of the system,the performance of microwave heating temperature control of Bang-Bang,PID,fuzzy PID and ANFIS are compared and analyzed by simulation.Based on OPC communication,the design of ANFIS temperature controller is realized by MATLAB and PLC.Furthermore,the control performance of ANFIS for temperature measurement point of medium is verified by comparing Bang-Bang,PID and fuzzy PID through experiments.Simulation and experimental results show that,among the four control strategies,ANFIS has the characteristics of fast response and high control accuracy,so it has good engineering practical value.The research in this paper is helpful to understand the improvement of the heating uniformity of the medium by the multi-feed port,and provides important help to promote the wide application of the multi-feed microwave heating device.