The dynamics study of the stick-slip driving system based on LuGre dynamic friction model

In this paper, a dynamics model of stick-slip driving system based on LuGre friction model was proposed. In the building of dynamics model of stick-slip driving system, a novel structure of stick-slip stage was designed and LuGre friction model was selected which is most suitable for the stick-slip driving. Combined with LuGre model and dynamics model of flexible hinge, the dynamics model of stick-slip system was built and simulated in Simulink software. The displacement, speed and acceleration curve of PZT, inertial mass and slider were obtained. Experiment prototype and the testing of stick-slip driving system were also designed. The actual displacement curve of different direction of slider and the step displacement curve of PZT were tested and the problem of different direction with different displacement was found. In order to better compare testing results and simulation results, simulation results and testing results were processed to show in a figure. The simulation results are validated by the testing results. Therefore, the dynamics model is suitable to study the novel stick-slip stage and a kind of problem in stick-slip driving.