ACTIVE DISTURBANCE REJECTION CONTROL ALGORITHM FOR THE UNWINDING TENSION SYSTEM IN GRAVURE PRINTING MACHINE

In high-speed and high-precision printing process, the stability of tension control is essential for printing control system because the fluctuation and variation of tension have an important influence on the precision of the print register. This paper presents a unique decoupling controller based on active disturbance rejection control (ADRC) method in order to strengthen the stability of the tension in unwinding system of gravure printing machines. In this paper, we first construct a nonlinear decoupling model in order to get the order and the static decoupling part of the unwinding system. Secondly, based on the order and the static decoupling part, an ADRC decoupling controller is designed for the unwinding tension system of gravure printing machines. Finally, the results of simulation with ADRC and PID controllers show that the proposed tension controller achieves a good decoupling control for unwinding system and has better robustness against internal and external disturbance than traditional PID controller in tension control of the unwinding system.