Research On Tension Control System Of Automatic Fiber Laying Machine

Composite materials have been widely used in military and civil industries such as aviation and aerospace because of the advantages of high specific strength,high specific modulus,light weight,high strength,wear resistance and anti-interference,which make up for the defects of some metal materials in terms of performance.Automatic fiber placement technology is an important part of the composite material forming process.The quality of the placement process directly determines the final quality of the product as well.The fiber tension control technology in the laying process is the core technology in the forming process.The research on the fiber tension control system in the fiber laying process is of great significance to improve the quality of products such as winding or laying.At present,the laboratory will carry out research on the tension control system of fiber laying based on robots.Therefore,a tow tension control system is designed in this paper.The main research contents of this paper are as follows:Firstly,the scheme of fiber tension control system was determined.Through comparative analysis,it can be seen that most of the current research on tension control system adopts PLC control method,but the future research direction of the laboratory is to be combined with robots,the motion controller can be well combined with robots.Therefore,this project uses the motion controller as the main controller,the computer as the upper computer,the servo motor as the executive element of the system,and the tension sensor as the detection element of the system closed-loop tension control scheme.In this process,the servo motor adopts the speed control mode,and the fiber tension of the system is established by the speed difference of the retracting motor.the three-dimensional model diagram of the tension control system experiment platform is drawed,the components of the tension system are selected and analyzed,and the construction of the experiment platform is completed finally.Secondly,the working principle of the system was analyzed,and the mathematical models and transfer function of each parts are established.By establishing the mathematical model of the system,the transfer function is obtained,and the control system is simulated and analyzed in Matlab/Simulink.The control system adopts PID control and Fuzzy PID control,and carries on the feasibility verification analysis and simulation of the system in Simulink.In the face of tension and velocity disturbance of the system,the two control algorithms were compared and analyzed,and their respective advantages and disadvantages are obtained.Then,the software design of the tension control system is completed.The upper computer interface of the system adopts a modular design method,which can achieve tension setting input,real-time monitoring and other tension experimental analysis functions.In addition,the experimental data can be processed in real-time and displayed in graphics;the historical data can be saved and processed for easy query.Finally,the experimental platform of tension control system is built and the experimental study of tension control system is completed and analyzed.In the tension experimental platform,the tension control experiment research is carried out on the speed control mode of the servo motor,the parameters of PID control and Fuzzy PID control are adjusted,the response of the system to the two algorithms is observed,and the control performance indicators of the system are calculated.Through the above work,the designed tension control system can meet the control requirements is verified.