Application Of Fuzzy Immune Self-adaptive PID For Constant Tension Control System

As the main control equipment in acrylic fibers product lines, paper, metallurgy making lines, the control precision affects the quality of the products. The control means based traditionally on controlled object are difficult to satisfy the demands of closed-loop control. The intelligence control that is based on knowledge and independent of models is a new way to solve the kind of questions, and it can improve the control quality.In view of practical use, taking the constant tension system of the lines as controlled plant, the thesis studies the nonlinear stochastic and complicated process with casual disturbance, high demands to dynamic process. This system is analyzed and mathematical model is built in this paper. The combination feasibility and mode of fuzzy system, immune system and PID control are studied, and then a compound control scheme-fuzzy adaptive PID control method that based on the immune feedback mechanism is proposed based the principium of immune feedback system and the approaching ability for nonlinear function of fuzzy rational logic, also the comparison among compound control, PID control and fuzzy self-adjusted PID control is made in simulation. The result of simulation experiment shows the improved performance is superior to the traditional PID controller. It works well with high dynamic and static performance, because of its advantages such as quick response , steady output, effective anti-interference and good robustness. The design is so simple that it can be applied to practice.