The Failure Times button in the Results tab of a reliability element allows you to view a distribution of the time to failure (from all modes) for the component:
Note: The Display button for
Failure Times is grayed out when the model is in Scenario Mode. That is,
you cannot view these results when running and comparing scenarios.
The Mean value that is displayed represents the Mean Time to Failure (MTTF) for the component.
The times to failure represent the time intervals between when the component starts operating to when it fails (i.e., the time to failure). Of course, if repairs are taking place, a single realization of the system can have multiple time intervals between failures. The distribution that is displayed incorporates all intervals for all realizations.
Note: If a component is being
modeled as a system, a "failure" includes instances when the system fails
directly and when it stops operating due to an internal requirement not being
met. However, if it stops operating due to an external requirement not
being met, this is not treated as a failure.
Ideally, a simulation will have produced a large number of failures and a well-defined distribution will have been developed by GoldSim. However, in some cases, the component will be unfailed at the end of the realization. This represents a censored sample of the failure time of the form “Failure time > X” , where X represents the time that the element had been operating as of the end of the realization. The manner in which this information is used to compute the failure distribution is described in Appendix A.
Note: GoldSim will only plot a
failure distribution if there are at least 10 failure records (a failure record
being either an actual failure time or a failure time of the form "Failure time
> X"). In addition, at least 25% of the records must be an actual failure
time (rather than a censored sample).
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