Flexible Electronics Electrospinning Dynamic Modeling And Feedback Control By Tuning Pump Flow

There has been great progress in the studies on manufacture techniques of microscale/nanoscale flexible electronic devices in recent years.Electrospinning,as one of the most important patterning methods in flexible electronics manufacturing,is widely used in the manufacture of TFT thin film transistor groove.However,the electrospinning dynamics involve complex nonlinearities and uncertainties.As a high-precision process,electrospinning is greatly affected by external noises.These all pose challenges to electrospinning dynamics modeling and feedback control.This paper have done research on the process of electrospinning jet dynamics modeling and feedback controller development based on pump flow adjustment in three parts.1)For the construction of experimental system,an electrospinning experimental platform based on pump flow adjustment is designed with online monitoring of electrospinning process,online setting of pump flow and real-time acquisition of jet diameter,which laid a good foundation to dynamics modeling and controller development.2)With the experimental data,the nonlinearities of electrospinning dynamics such as hysteresis and creep is analyzed.Then the electrospinning dynamics is modeled by nonlinear modeling methods such as NARX model and Koopman operator model.Comparing the modeling results of these two methods,when the training data is sufficient,the modeling error of Koopman operator based on EDMD is smaller,which can better explain the dynamics of electrospinning.3)A closed-loop control system with pump flow as input and electrospinning jet diameter as output is developed.To solve the uncertainties in electrospinning dynamics,an interval type-2 fuzzy logic controller is developed.Experimental results show that with the interval type-2 fuzzy controller,the diameter of electrospinning jet becomes stable and adjustable,and the tracking error is within ±1?m.These results show that the interval type-2 fuzzy logic controller is superior in dealing with uncertainties of electrospinning dynamics compared with PID and traditional type-1 fuzzy controller.The systematic studies of the electrospinning process in this paper provide good ideas for modeling of electrospinning dynamics.The feedback controller can effectively stabilize electrospinning process and promote the application of electrospinning in flexible electronic manufacturing.