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Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions
Joint Authors
Source
Mathematical Problems in Engineering
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-07-08
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
The existing methods of determining testing period do not consider the effect of working condition covariates on reliability testing period of Numerical Control (NC) machine tools, which may lead to high-cost testing or low-precision assessment.
Aiming at the problem, a new method of determining the testing period considering working condition covariates is proposed.
The change rate of interval estimation of Mean Time between Failures (MTBF) is used as the criterion for determining the length of testing period.
The reliability model of NC machine tools is established by the Cox proportional hazards model, and the two-step estimation method is used to estimate parameters of the baseline failure rate function and the coefficients of working condition covariates.
The Bootstrap resamples are obtained by the Bootstrap resampling method.
And then the parameters of the baseline failure rate function and the coefficients of working condition covariates are estimated simultaneously by maximum likelihood method, and thus interval estimations of MTBF under each covariate are obtained.
The change rate models of MTBF interval estimation under each covariate level are established by Power function, and the testing periods under each covariate are obtained.
Case study indicates that the testing periods under each covariate obtained by the proposed method are more accurate than those obtained by the others, when the same criterion and confidence level 1-α are set.
American Psychological Association (APA)
Li, Hongzhou& Lixia, Sun. 2018. Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions. Mathematical Problems in Engineering،Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1205971
Modern Language Association (MLA)
Li, Hongzhou& Lixia, Sun. Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions. Mathematical Problems in Engineering No. 2018 (2018), pp.1-8.
https://search.emarefa.net/detail/BIM-1205971
American Medical Association (AMA)
Li, Hongzhou& Lixia, Sun. Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions. Mathematical Problems in Engineering. 2018. Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1205971
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1205971