 |
Related Topics: |  |
 |
 |
|
 |
 |
 |
If you have the Synthesis version of ReliaSoft's life data analysis software, Weibull++, installed on your computer, you can transfer your data from RGA to a Weibull++ standard folio. This option available for time-to-failure data (except Multiple Systems – Known Operating Times), multi-phase data (except Mixed Data) and fielded data.
The current versions of RGA and Weibull++ are integrated via the Synthesis Platform. This means that when you transfer your RGA data, the same database will be automatically opened in the Weibull++ application. The RGA data will then be stored in a new Weibull++ standard folio that is in the same project as your RGA data.
To transfer your RGA data, first calculate the parameters of the data set, and then choose Growth Data > Transfer Data > Transfer to Weibull++ or click the icon on the Main page of the control panel.
The Transfer to Weibull++ window appears, as shown next. The options that are available will depend on the type of RGA data sheet and model you are using.
The What to Transfer? area allows you to specify how your RGA data will be handled in Weibull++.
First failure for each system transfers only the first failure time of each system in the RGA data sheet. Choose this option if you wish to use the Weibull++ standard folio to fit a life distribution to the first times to failure and calculate the reliability (i.e., probability of operating without failure for a period of time) of the system.
Time between failures in individual systems transfers all the failure times of each system in the RGA data sheet. Although it is generally not recommended to fit a life distribution to repairable systems data, you might choose this option if you wish to use the Weibull++ standard folio to fit a distribution to the data set for simulation in BlockSim, ReliaSoft's system reliability and maintainability analysis software.
If the failure times in RGA are cumulative, then the process converts the times into their equivalent non-cumulative failure times (because data entry in the Weibull++ standard folio is always non-cumulative). If the data in the RGA data sheet are already non-cumulative, then no conversion will occur and the failure times that are transferred to Weibull++ will appear as they do in RGA.
Time between failure IDs across systems transfers all the failure times in the RGA data sheet based on the unique failure modes in each system (you will need to select one of the options in the Apply Failure ID area to serve as the identifier for the failure modes). Choose this option if you wish to use the Weibull++ standard folio to fit a distribution to each failure mode (assuming that the systems are the lowest repairable units).
If a failure mode did not occur in a particular system, then it will be treated as a suspension for that system. Similar to the previous option, if the failure times are cumulative, the process converts the data into their equivalent non-cumulative failure times; if the data are already non-cumulative, then no data conversion will occur.
The Apply Failure ID? area allows you to specify how each data point in the Weibull++ data sheet will be grouped into subsets:
The None option does not group the data points in the Weibull++ data sheet.
The Use the "Mode" column option is available only when using the Crow Extended or Crow Extended - Continuous Evaluation models. It transfers the combined information from the Classification and Mode columns in the RGA data sheet to the Subset ID column in Weibull++. For example, for an RGA data point that has the classification "BD" for mode "100," that data point will be categorized as part of subset "BD100" in Weibull++.
The Use the "Comment" column option uses any text/values that were entered in the Comments column of the RGA data sheet to group the data points in Weibull++.
When you select to apply a failure ID, all subsets are assumed to end at the same time. For example, if you have two systems where the observation period for System 1 ended at 100 hours and for System 2 at 150 hours, then the transferred data for System 1 will automatically include a suspension time that covers the difference between the end times of the two systems.
Note that if the data were cumulative, then the suspension time would be the difference between the last failure time for System 1 and the last failure time for System 2 (e.g., 150 - 100 = 50 hours), but if the RGA data were non-cumulative, then the suspension time would be the difference between the last failure time for system 1 and the total test duration (e.g., if the observation period ended at 250 hours, then the suspension time would be 250 - 100 = 150 hours).
The following examples show pictures of how data from a cumulative Failure Times data sheet in RGA may be transferred to a Weibull++ standard folio. Here is the original RGA data.
RGA Failure Times data sheet (cumulative)
Example 1: Here is the data set transferred to Weibull++ using the "Time between failures in individual systems" option with no failure ID applied. The cumulative times have been converted to non-cumulative. All failure times are transferred, but the failure mode is not identified.
Example 2: Here is the data set transferred to Weibull++ using the "Time between failures in individual systems" option and the "Use the Mode column" option. The cumulative times have been converted to non-cumulative. The failure times are grouped into subsets based on the combined information from the Classification and Mode columns in the RGA data sheet. The suspension data are added automatically to ensure that all the subsets have the same termination time.
Example 3: Here is the data set transferred to Weibull++ using the "Time between failures in individual systems" option and the "Use the Comment column" option. The results are the same as example 2, except that the failure IDs came from the Comments column in the RGA data sheet.
© 1992-2015. ReliaSoft Corporation. ALL RIGHTS RESERVED.