期刊
MECHANISM AND MACHINE THEORY
卷 73, 期 -, 页码 76-90出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mechmachtheory.2013.10.008
关键词
Double-nut ball screw; Contact angle; Normal force; Dynamic contact stiffness
资金
- National Science and Technology Major Project of the Ministry of Science and Technology of China [2009ZX04011-031, 2012ZX04002-012]
This paper aims to investigate the dynamic contact stiffness characteristics of a double-nut ball screw operating at high speeds. The present study first established a proper transformed coordinate system according to the ball screw mechanism, then a variable contact angle is now considered as a function of the position angle of balls to reflect their dependence on the distribution in the raceway. It goes further to derive a contact stiffness matrix to capture the dynamic behavior of ball screws, which is based on the quasi-static method. The obtained numerical results are validated by experiment. Finally, the 5-dof dynamic model is employed to investigate the distribution of contact angles and normal force varying with the ball screw position angle under different operation condition and structure parameters, and the relation between dynamic contact stiffness and operation condition and structure parameters. (C) 2013 Elsevier Ltd. All rights reserved.
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