Study on Dynamic Characteristics of Sliding Friction Interfaces in Feed System During Non-stable Starting Stage*

The feeding system with the sliding friction interfaces generates flexible shock and vibration when the driving motor is discontinuously accelerated during the starting stage. Due to the influences of the nonlinear frictional force behavior between the sliding interfaces the motion accuracy and service life of the feeding system are degraded. To understand the variation trend of the frictional force in starting transition stage from the pre-sliding regime to the macro slip regime, a LuGre model of the sliding interfaces based on the parameters identification of model using particle swarm optimization (PSO) is established, which is integrated into a joint MATLAB-ADAMS simulation model to describe frictional dynamics characteristic of the feed system. The effects of the frictional force and motor's acceleration curve on the feed system is analyzed. The simulation results show that the flexible shock of the feed system is partially offset by the frictional force between the sliding interfaces during unstable start-up stage and can be suppressed by S-type velocity curve with continuous jerk.