Decoupling control parameter method to study the mechanism of time-domain accuracy evolution in the feed system

The dynamic accuracy of the feed system in CNC machine tools is determined by its dynamic design. Currently dominant frequency-domain analysis and design methods lack a direct correlation with user-concerned time-domain indices such as positioning accuracy and repeatability accuracy. The feed system is composed of four subsystems: motion planning, control system, servo motor, and mechanical components. These subsystems are mutually coupled and collectively affect its time-domain accuracy. Among them, motion planning is determined by user requirements, while the control system’s parameters are adjustable. Therefore, the core of dynamic design lies in eliminating the interference of the control system under specific motion planning to conduct electromechanical system design. To address this, this paper proposes a control system decoupling method. For different mechatronic matching combinations, intelligent optimization algorithms optimize control parameters. This separates control system interference on time-domain accuracy, highlighting mechatronic matching’s influence mechanism. This study verifies its effectiveness via feed system integration models and experiments. It provides theoretical and practical guidance for time-domain accuracy-oriented dynamic optimization of feed systems.