Reliability HotWire

Reliability HotWire

Issue 114, August 2010

Tool Tips

*How do I use the two views in RGA 7 for entering data from multiple systems (Normal and Advanced)?

RGA 7 provides two ways of combining data from multiple individual systems into a single system for analysis purposes (called the “equivalent” system in reliability growth analyses and the “superposition” system in fielded systems analyses).

The Normal View displays the data for multiple systems all together in the same Data Sheet.

Multiple Systems Normal View

When entering data, you use the System ID column to specify which system the data point belongs to and you use the Event column to specify the type of event, i.e. the start time of the observation period (S), the individual failure times (F) and the end time of the observation period (E).

For data entry, this view is useful when you are copying or importing data from another data source (e.g. an Excel file) where you have the data for all systems in one place.

The Advanced View displays the data for each system in a separate Data Sheet. The panel on the left side of the window displays all of the systems that have been defined in the Folio and allows you to switch from one Data Sheet to the other.

Multiple Systems Advanced View

When entering data, you specify the start and end times in the first two cells of the Time to Event column and you enter the failure times in the remaining cells. You can use the panel on the left side of the window to add, delete and rename systems.

With this view, when you calculate the results for the combined “superposition” or “equivalent” system analysis, you can select which systems to include or exclude. This allows you to try different scenarios and may be useful in situations when you are analyzing your data in multiple ways.

*Can Xfmea and RCM++ share FMEA data with XFRACAS?

Yes. Here are the instructions for sharing FMEA data between Xfmea 5/RCM++ 5 and XFRACAS:

  • Using failure mode data from XFRACAS in Xfmea or RCM++:
    • You can use the XFRACAS Analysis page in XFRACAS to export a list of all failure modes for a selected part. You can then use the Import from Excel tool in Xfmea or RCM++ and select the XFRACAS option to import the XFRACAS data into the FMEA for a selected item. This provides valuable information about what failure modes (causes) have been observed in the field and how many times they occurred.
  • Using FMEA data from Xfmea or RCM++ in XFRACAS:
    • Xfmea and RCM++ are shipped with a predefined import/export template that you can use to export FMEA data to an Excel spreadsheet that can be imported into XFRACAS. To do so, use the Export to Excel tool in Xfmea/RCM++ and select the XFRACAS option. You can then use the Data Import Utility, Xfmea/RCM++ Failure Modes option in XFRACAS to import the FMEA data. Then, using the Add Lookup Issue - Failure Mode utility, you can configure XFRACAS to allow users to classify each incident, problem resolution report or failure analysis report with a particular segment of the FMEA for that product. This classification makes it easier to track how many times a particular problem occurs in the field.