期刊
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
卷 235, 期 8, 页码 1499-1513出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1350650120972302
关键词
Guideway; wear; quasicontinuum medium method; exponential wear model; precision retention
资金
- National Natural Science Foundation of China [51975012]
- Beijing Nova Programmer Interdisciplinary Cooperation Project [Z191100001119010]
- National Science and Technology Major Project [2018ZX04033001003]
In this paper, a multiscale method based on the quasicontinuum medium principle is proposed to describe the degradation process of guideway linear precision using an exponential model. By obtaining micro-topography information of the guideway surface through the Depth From Defocus (DFD) method, the wear state of the guideway is verified under different loading conditions, confirming the validity of using the QM method to establish the guideway exponential wear model.
At present, wear models and accuracy prediction of guideway are established based on elastoplastic mechanics of continuous media. These methods are limited to describe the process of accuracy degradation by using the material performance defined based on macroscopic hypothesis condition. In this paper, the multiscale method based on quasicontinuum medium(QM) principle is proposed to describe the degradation process of guideway linear precision with an exponential model. According to the wear distribution of the guideway surface with the micro-morphology evolution process, the measurement value of the guideway linear precision is modeled systematically. Then, using the quasicontinuum medium method instead of the continuum hypothesis, the exponential wear model of guideway is established. The exponential wear model uses the wear exponent to describe the wear status based on linear precision measurement rather than tremendous wear volume tests. By means of Depth From Defocus (DFD) method, the micro-topography information of the guideway surface is obtained. Therefore, the wear state of the guideway is verified under different loading conditions, and the validity of using the QM method to establish the guideway exponential wear model is verified.
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