Implementing improved repetitive control in printing and die-cutting machine servo system for disturbance rejection

In this paper, we address the issue of improved performance of servo control for corrugated paper printing and die-cutting machine. For two important operations in corrugated paper manufacture process (lead-edge feeding and die-cutting), the motion characteristics are analyzed. Improved repetitive control method is proposed to improve accuracy of the system by rejecting disturbance. The improved method combines sliding mode control and repetitive control, repetitive control is used to reduce or eliminate periodic disturbances while sliding mode control is used to reduce the impact of load change. To verify the effectiveness of proposed control method, we take feeding roller servo system for lead-edge feeding operation as an example. According to the structure of lead-edge feeding servo system, an identification experiment is designed for feeding roller servo system, and obtain the mathematical model of the system by analyzing data of frequency domain response, then simulation results are present to illustrate the improved performance of proposed method.