Related Topics:

Failure Modes and Reliability Analysis (FMRA)

FMRA Record Properties

Add to Mirror Group Window

By adding multiple cause records to a mirror group, you can place the same cause in more than one location in the FMRA hierarchy. This is useful when you need to consider common cause failures (i.e., single faults that result in the failure of multiple components) in your analysis. Typical examples of common cause failures include impact, vibration, temperature, contaminants, miscalibration, improper maintenance, and so forth.

Adding Causes to Mirror Groups

In Xfmea, mirroring is accomplished by adding causes to a mirror group via the Mirror Group window. To add a cause to a mirror group, select it in the FMRA and choose FMRA > RAM Analysis > Mirrors > Add Cause to Mirror Group.

All cause records in a mirror group (i.e., "mirrored causes") are treated as representing the very same cause. To accommodate this, the use of mirror groups will change the properties of cause records in the following ways:

Removing Causes from Mirror Groups

To remove a cause from a mirror group, select it and choose FMRA > RAM Analysis > Mirrors > Remove Cause from Mirror Group.

To remove all causes from all mirror groups, choose FMRA > RAM Analysis > Mirrors > Clear All Mirror Groups. (Note that this does not delete mirror groups; it only removes causes from them. To delete mirror groups, use the Resource Manager.)

 

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