Application Of Variable-domain Fuzzy Control In Graphene Temperature Control

With the development of The Times,the emergence of graphene has attracted the attention of the scientific community,and it is widely used in industrial production and scientific research.In this paper,the temperature range of graphene prepared by oxidation method is controlled.During the preparation of the overall temperature is the most important indicators affect output,mainly considering temperature degeneration,hysteresis and nonlinear limit characteristics,the current in the kettle temperature as control object of study,the PID algorithm has been throughout the control field,is based on the PID intelligent control design a new type of controller,including interference is contained in the background of this paper to adjust the process of temperature control,designed to meet the requirements of the preparation of graphene oxide temperature control system.Through the analysis of the process flow of graphene prepared by oxidation method,the temperature-flow linkage control mode is constructed by taking the rise time,overshoot and regulation time into consideration.The opening of cold and hot media valve is used as the main regulating device and the temperature as the feedback signal,so as to improve the control efficiency.Combined with kettle temperature parameter relationship model with cold and hot medium,because of the large amount of PID control overshoot,unable to work in the nonlinear systems,once the parameters when the system after a substantial fluctuations is difficult to make a response,so will be combined into a new type of fuzzy-PID controller and fuzzy controller,temperature controller PID composite structure enhance its robustness.Due to the limitation of the quantization level of fuzzy control rules,the controlaccuracy is affected.If the fuzzy rules are added to identify weak temperature fluctuations,the workload will increase and the regulation time will increase,and the complex factors will be shaken.The rules are refined by combining the quantization factor and scale factor in the theory of variable theory domain.For this dual mode composite controller,the selection of switching mode is also very important.In order to maintain the smoothness of the switching process,this project USES the trapezoidal membership function method to complete the switching.The system simulation diagram proves that the fuzzy-PID composite temperature controller in the variable theory domain combined with the trapezoid membership degree switch can adjust faster and overshoot less under different temperature requirements of graphene prepared by oxidation method,and can quickly recover to the required range after interference.It shows that the control algorithm can achieve ideal effect in temperature control of graphene prepared by oxidation.