Hybrid Modeling of Ball Screw Drives With Coupled Axial,Torsional, and Lateral Dynamics精编.pdf

Hybrid Modeling of Ball Screw Drives With Coupled Axial, Torsional, and Lateral Dynamics Chinedum E. Okwudire It has been a common practice to assume that the torsional and axial dynamics are Yusuf Altintas totally decoupled from the lateral dynamics of the screw when modeling ball screw Professor drives. However, experiments show that there is a considerable coupling between them, Fellow ASME which could adversely affect the positioning accuracy and fatigue life of the drive. In this e-mail: altintas@mech.ubc.ca paper, the lateral dynamics of the screw is explicitly incorporated into the hybrid finite element model of ball screw drives. The ball screw is modeled by Timoshenko beam Manufacturing Automation Laboratory, elements, and the balls, joints, bearings, and fasteners are modeled as pure springs. Rigid University of British Columbia, components are modeled as lumped masses. The proposed screw-nut interface model, 6250 Applied Sciences Lane, which includes the effects of lateral vibrations, is shown to predict the coupling between Vancouver, BC, V6T 1Z4, Canada axial, torsional, and lateral dynamics of ball screw drives. The effects of this dynamic coupling on the positioning accuracy of the drive are also presented with experimental