Research Of Constant-Tension Control Strategy In Gravure Press Machine

Tension control is a very important part of process control in printing and parking service. The quality of control decides the product quality and productivity. Main objects discussed in the study focus on the unwinding or winding tension control for the gravure press machine. A film tension control system features great dynamic change, strong coupling between film velocity and tension, many sources of disturbance in winding and unwinding processes, and also a non-linear system. The tension among machines is coupling too. The tension in any place will lead to tension fluctuation in other places. Tension control becomes more difficult because modern gravure press machine possessing high speed and auto material-exchanging. The traditional PI control can not satisfy the requirements of control precision and system stability.This paper analyses thoroughly the tension control system and get the math model of the simple system. It indicates the way that set up equation of the dynamical system. A tension controller has finished for the unwinding process of the gravure printing machine, which main control setup is 80C196KC singlechip and which control elements are magnetic powder brake and magnetic powder clutch. Finally hardware is simply clarified in this dissertation. The control tactics of the system has been discussed in this discourse . We propose a novel approach to optimize the parameters of tension PID controller with pseudo parallel genetic algorithm employed. The criteria take the integral of absolute error and time for evaluation. Based on this evaluation function, we optimize the parameters of tension PID controller. We conduct computer simulation studies to evaluate the performance of the proposed method and our results are promising. When used with tension plants, the proposed technique can improve the control performance of PID controllers.