Abstract
To realize the accurate motion control of the ball screw feed system, it is necessary to establish a reasonable dynamic model. However, the dynamic characteristics of the ball screw feed system are time-varying and nonlinear in practice. Therefore, a Linear Parameter Varying (LPV) modeling method is proposed. Firstly, the rigid body model considering the mechanical and electrical characteristics and the flexible body model considering the change of table position and workpiece mass are established, and the model parameters are further identified. Then, the LPV model is established based on the rigid body model and flexible body model. Finally, the LPV model is proved to be able to well characterize the time-varying dynamic characteristics of the ball screw feed system, which is proved by simulation experiment of modal analysis.
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