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How can I use an FMEA block diagram to define the scope of an analysis?



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In Xfmea/RCM++/RBI an FMEA block diagram is a visible depiction of the system or assembly that will be analyzed in a design FMEA. These diagrams help to define the scope of a particular analysis and may also provide additional information that will be useful to the analysis team when they attempt to identify potential failure modes. In Version 10, the block diagram can now be interactive with both the system hierarchy and the FMEA.


For example, consider the system hierarchy shown next for an all-terrain bicycle.

System Hierarchy

To create an FMEA block diagram based on this configuration, select the bicycle in the System panel then choose System Hierarchy > Current Item > Diagrams > FMEA Block Diagram.

FMEA Block Diagram Icon

After the diagram is created, you can rearrange the blocks as needed and add connections to define the interfaces between the components (physical, material exchange, energy transfer or data exchange). Choose Diagram > Settings > Connect Blocks and select the connection type.

Connect Blocks

To add blocks for additional interactions (such as the Ground and Rider in this example), choose Diagram > Blocks > Add Block.

Add Block

The following image shows some of the interactions that could be defined for the bicycle.

FMEA Diagram

If you want to use the interactions from the diagram as a starting point for identifying potential failure modes in the FMEA, use the Connections panel to select the connections that you want to consider, then choose Diagram > Blocks > Create Functions.

Create Functions Icon

The following picture shows the new FMEA with functions automatically created based on the selected interactions.