Reliability Evaluation of NC Machine Tools considering Working Conditions
Joint Authors
Yang, Zhaojun
Li, Hongzhou
Xu, Binbin
Chen, Chuanhai
Kan, Yingnan
Liu, Guofei
Source
Mathematical Problems in Engineering
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-05-04
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
Reliability evaluation is the basis for reliability design of NC machine tools.
Since traditional reliability evaluation methods do not consider the working conditions’ effects on reliability, there is a great error of a result of a traditional method compared with an actual value.
A new reliability evaluation model of NC machine tools is proposed based on the Cox proportional hazards model, which describes the mathematical relation between the working condition covariates and the reliability level of NC machine tools.
Firstly, the coefficients of working condition covariates in the new reliability evaluation model are estimated by the partial likelihood estimation method; secondly, the working condition covariates which have no effects on the reliability of NC machine tools are eliminated by the likelihood ratio test; then parameters of the baseline failure rate function are estimated by the maximum likelihood estimation method.
Thus, the reliability evaluation model of NC machine tool is obtained under different working conditions and the reliability level of NC machine tools is obtained.
Case study shows that the proposed method could establish the relation between the working condition covariates and the reliability level of NC machine tools, and it would provide a new way for the reliability evaluation of NC machine tools.
American Psychological Association (APA)
Li, Hongzhou& Yang, Zhaojun& Xu, Binbin& Chen, Chuanhai& Kan, Yingnan& Liu, Guofei. 2016. Reliability Evaluation of NC Machine Tools considering Working Conditions. Mathematical Problems in Engineering،Vol. 2016, no. 2016, pp.1-11.
https://search.emarefa.net/detail/BIM-1112938
Modern Language Association (MLA)
Li, Hongzhou…[et al.]. Reliability Evaluation of NC Machine Tools considering Working Conditions. Mathematical Problems in Engineering No. 2016 (2016), pp.1-11.
https://search.emarefa.net/detail/BIM-1112938
American Medical Association (AMA)
Li, Hongzhou& Yang, Zhaojun& Xu, Binbin& Chen, Chuanhai& Kan, Yingnan& Liu, Guofei. Reliability Evaluation of NC Machine Tools considering Working Conditions. Mathematical Problems in Engineering. 2016. Vol. 2016, no. 2016, pp.1-11.
https://search.emarefa.net/detail/BIM-1112938
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1112938