Research And Implementation Of Constant Temperature Control System Based On Genetic Ant Colony Algorithm

Based on the research of thermophysical properties measurement technology for high temperature materials,this project designs a high precision temperature control system for high temperature heating furnace of material thermal diffusivity measurement device.At present,the temperature control system is involved in all kinds of industrial production links,essential facilities and scientific research equipment.But the controlled object belongs to the nonlinear,large lag,large inertia system,and there is randomness and instability.In some special research fields,the precision of temperature control can not reach the standard.How to further improve the precision of temperature control is an important topic in the study of temperature control.In this paper,high-temperature heating furnace of material thermal diffusivity measurement device is taken as a research object,and a constant temperature control system based on genetic ant colony algorithm is designed.Aiming at the PID parameter self-tuning problem,the slow convergence rate of genetic algorithm and the slow accumulation of early pheromone of ant colony algorithm,PID control algorithm based on genetic ant colony hybrid algorithm is studied.According to the established mathematical model of high temperature heating furnace,a simulation experiment of self-tuning of PID parameters by Genetic-Ant Colony Hybrid algorithm was carried out under MATLAB simulation platform.The simulation results are compared with those of genetic PID control and ant colony PID respectively.The results show that the control algorithm has some improvements in response time and control accuracy.For the actual situation of high-temperature thermal diffusion measurement,the design selected MCT HgCdTe detector as a temperature signal collector for improving signal detection accuracy in signal acquisition phase.For the current HgCdTe detector amplification circuit,there is a low common mode rejection ratio,long response time,poor sensitivity and stability defects.This article designed an improved signal acquisition circuit,signal amplifier and signal filtering circuit to achieve high-precision temperature signal acquisition.At the same time,this paper completed the core board layout,WIFI communication and control system design of closed-loop circuits.The transplantation of ?C/OS-II operating system in STM32 can achieve multitask control.PC software was programmed by MFC to achieve the functions of the parameters set and real-time temperature data display.The HL-150/150 W heating furnace is chosen as the experimental object.Through the measured data,the temperature control system designed in this paper is controlled at 100-300? range,and the control accuracy is ±1?.