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• W2902487350 abstract "It is of great significance to study the dynamic characteristics of twin ball screw (TBS) feed system to improve the precision of gantry-type dual-driven computer numerical control (CNC) machine tools. In this paper, an equivalent dynamic model of the TBS feed system is established utilizing lumped mass method considering the stiffness of joints. Equivalent axial stiffness of screw-nut joints and bearing joints are both calculated by Hertz contact theory. Furthermore, a friction model is proposed because the friction force of the screw nut affects the stiffness of the joints. Then, the friction parameters are obtained by using the nonlinear system identification method. Meanwhile, a finite element model (FEM) is developed to assess the dynamic characteristics of TBS feed system under the stiffness of joints. Finally, validation experiments are conducted, and the results show that the positions of the nut and the velocities of worktable greatly affect the dynamic characteristics of the TBS feed system. Compared with the theoretical calculation, FEM and experiments indicate that the dynamic modeling proposed in this article can reach a higher accuracy." @default.
• W2902487350 created "2018-12-11" @default.
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• W2902487350 date "2018-12-01" @default.
• W2902487350 modified "2023-10-18" @default.
• W2902487350 title "Dynamic Modeling and Experiment Research on Twin Ball Screw Feed System Considering the Joint Stiffness" @default.
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• W2902487350 doi "https://doi.org/10.3390/sym10120686" @default.
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