bearingcage: Large system bearing cage fracture test
In Auburngrads/SMRD: Statistical Methods For Reliability Data

Ball bearing assembly failure data

The service life requirement for a ball bearing assembly was specified such that t[0.1] (aka the B10 life) be greater that 8000 hours. Analysts were concerned that the design of the bearing cage in this assembly was inadequate and could lead to premature failures during service. Service times were collected for 1703 assemblies that were introduced into service over time. The analysts wanted to use the service life data to determine if a redesign was needed to ensure that the units could meet the service life requirement. Management was also interested in determining the number of additional failures that could be expected over the next year for the population of assemblies already in service.

A data.frame with 25 rows and 3 variables:

[, 1]	hours	Accumulated time at `event`	Numeric
[, 2]	event	Event observed at `hours` (failure/right-censored/left-censored/interval-censored)	Categoric
[, 3]	count	Number of events observed at `hours`	Numeric

Bearing cages are used in ball bearing assemblies to ensure that the ball bearings do not drift out of position relative to the other ball bearings during use.

Abernethy, R. B., Breneman, J. E., Medlin, C. H., and Reinman, G. L. (1983) Weibull Analysis Handbook, Air Force Wright Aeronautical Laboratories Technical Report AFWAL-TR-83-2079

Auburngrads/SMRD documentation built on Sept. 14, 2020, 2:21 a.m.