Related Topics:

System Hierarchy

FMEAs

Universal Reliability Definitions (URDs)

Performing Calculations with the FMRA

Failure Modes and Reliability Analysis (FMRA)

RCM++ includes a failure modes and reliability analysis (FMRA) that is used to:

What's Changed? In previous versions of RCM++, an item's reliability was defined in the Item Reliability window, which was accessed from the system hierarchy. Now, reliability is defined using probability models that can be assigned via the FMRA to items from the system hierarchy and/or to functions, failures and causes from the FMEA.

The FMRA can be enabled or disabled by choosing View > FMRA > Show FMRA.

When the FMRA is enabled, you can access it by clicking the FMRA tab of the System panel.

This view displays all of the items in the system hierarchy, in addition to any functions, failures and causes that have been defined for those items. All of these records are arranged in a tree-like configuration like the one shown next.

By default, the software assumes a reliability-wise series configuration. According to this assumption and the above hierarchy, System 1 fails if Cause 1 occurs or if either of its two components fails. Component A fails if Cause 2 occurs, and Component B fails if Cause 3 or Cause 4 occurs. If you do not want to assume a series configuration and you have BlockSim 8 installed on your computer, you can use BlockSim to synchronize the hierarchy with RBDs and arrange the records in a more complex configuration.

Available Columns

The columns of the FMRA display calculation results and additional information about each record in the hierarchy. To hide or display columns, right-click the column headers in the FMRA, then click Customize Columns to select which columns you want to display. These settings are stored per computer/username on the FMRA page of the Application Setup, so any project that you open on this computer will have the same columns displayed.

The following columns can be displayed:

Note: It is not possible to simulate failure times for components whose reliability is defined by a constant value. Failure times can be simulated only in contexts where reliability is time-dependent. Thus, the calculated operating costs for any component with a constant reliability will be zero. In these situations, it may be advisable to change the model from a constant value to a time-dependent distribution. See Changing Constant Probability Models to Distributions.

 

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