Mean Time to Achieve a Failure-Free Requirement under Provisions of Spare and Repair
This paper obtains an expression for the mean test-time to achieve a failure-free requirement under the provisions of spare and repair.
Mean Time to Achieve a Failure-Free Requirement
A common reliability test procedure is to test until a given, consecutive, failure-free time has passed. This paper gives expressions for the mean time to test completion, for both elapsed and operating time, for general probability distributions. The situations in which the test is monitored periodically and the repair time is not zero are considered. The standard deviation of completion time is also discussed. The special case in which the time-to-failure distribution is exponential is treated in some detail.
Failure-Free Reliability Tests.
Abstract : A failure-free reliability test is compared with a fixed-time test under a two-parameter Weibull failure distribution. The distribution of the length of the failure-free test is derived, along with conditional failure probabilities for items still operating at the end of the original burn-in time. Graphs are provided for calculating expected test length and conditional failure probabilities. (Author)