Related Topics:
	Failure Modes and Reliability Analysis

Setting the Operation Properties for an FMRA

Before you perform analytical calculations or simulations in the FMRA, make sure you at least specify the operating time for the top-level item. If applicable, you can also specify other operation properties at the individual item level.

These properties are located under the Operation heading when you select an item in either the system hierarchy or FMRA in Xfmea/RCM++/RBI.

• Operating Time: The amount of time for which the system is expected to operate (and the time for which the results are estimated). This can be modified at the system level only. When you perform a simulation-based calculation, you can also edit this value in the simulation settings window.

• Current Age: The age of the item at the start of the analysis. It allows you to define items that have already accumulated age prior to the start of the current mission (i.e., used components).

• Duty Cycle: Allows you to model situations where the actual usage during system operation is not identical to the usage for which you have data.

• Continuous operation at the rated load is considered to be a duty cycle of 1.

• Any other level of usage is expressed as a percentage of the rated load value or operating time. A duty cycle higher than 1 indicates a load in excess of the rated value.

• Maintenance Group: Allows you to keep a record of the maintenance group that an item is assigned to. This field is for reference only and does not affect any calculations.