Reliability Assessment Test Design for Numerical Control Machine Tools

Zhi Ming Wang

doi:10.4028/www.scientific.net/AMR.542-543.1218

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 542-543Reliability Assessment Test Design for Numerical...

Reliability Assessment Test Design for Numerical Control Machine Tools

Abstract:

According to the required interval estimation precision of mean time between failures (MTBF) and reliability for numerical control (NC) machine tools, where failure processes can be described by the power law process model, the minimal testing truncated time and sample size of the reliability assessment test are given using Fisher information matrix method. The results show that there are two main factors which affect the truncated time and sample size. They are the log ratio of upper bound to lower bound and confidence of interval estimation for reliability indices, respectively. Among them, the minimal sample size increases significantly as the improvement of required precision of interval estimation for reliability indices and confidence increases, but the minimal testing truncated time is less affected by these two factors.

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Periodical:

Advanced Materials Research (Volumes 542-543)

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1218-1221

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.542-543.1218

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Online since:

June 2012

Authors:

Zhi Ming Wang

Keywords:

Numerical Control Machine Tool, Power Law Process, Reliability Assessment, Sample Size, Testing Time

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