查看文章

In this study, a multi-degree-of-freedom model is developed to investigate the vibration characteristics of a feed system with nonlinear kinematic joints. Linear guide, ball screw, and ball bearing are the main kinematic joints that connect and support the worktable of a feed system. Considering the contact behaviors of rolling balls, contact force is a piecewise smooth function of displacements of the multi-degree-of-freedom system. In terms of modeling, geometry and material parameters are determined according to the experimental feed system and the model is verified by a dynamic experiment. The motion equations of the system are derived to evaluate the effects of force excitation and screw-nut position on the vibration amplitude and stable state of the vibratory system. With the variation of screw-nut position, there exist jumping phenomena for displacement and deformation amplitude near the resonance …