Volume 38, Number 5, October 2020
|Page(s)||1001 - 1009|
|Published online||08 December 2020|
Rigid-Body Dynamic Analysis of Multi-Stage Planetary Roller Screw Mechanism
Shaanxi Engineering Laboratory for Transmissions and Controls, Northwestern Polytechnical University, Xi'an 710072, China
2 China Academy of Launch Vehicle Technology, Beijing 100076, China
Based on the structural characteristics of the multi-stage Planetary Roller Screw Mechanism (PRSM), the motion and force among the different stages are analyzed. In terms of the Newton's second law, the rigid-body motion equations of the multi-stage PRSM without considering the manufacturing and assembly errors are derived. Then, the method for solving the motion equations is given. The forces acting on the parts in the multi-stage PRSM and the motion of the mechanism can be obtained from the present rigid-body dynamic model. The influence of the friction coefficients among the different stages on the dynamic characteristics of the multi-stage PRSM is discussed. The results show that the forces acting on the first-stage PRSM are larger than that acting on the second-stage PRSM, although the nominal radius of the screw in the first-stage PRSM is smaller. The friction coefficient between the nut and the screw in the different stages has the great influence on the efficiency of multi-stages PRSM with small helix angles, while that among the screws in the different stages has the slight effect on the efficiency.
Key words: multi-stage planetary roller screw mechanism / motion analysis / force analysis / dynamics
关键字 : 多级行星滚柱丝杠 / 运动分析 / 受力分析 / 动力学
© 2020 Journal of Northwestern Polytechnical University. All rights reserved.
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