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Foundation ::
Failure Analysis ::
CRANS
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CRANS
Configurable Real-Time Analysis System
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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In a real-time environment, the results of changes or failures in a
complex, interconnected system need evaluation quickly. Tabulations showing
the effects of changes and/or failures of a given item in the system are
generally only useful for a single input, and only with regard to that item.
Subsequent changes become harder to evaluate as combinations of failures
produce a cascade effect. When confronted by multiple indicated failures
in the system, it becomes necessary to determine a single cause. In this
case, failure tables are not very helpful.
CRANS, the Configurable Realtime
ANalysis System, can interpret a logic tree, constructed by the user,
describing a complex system and determine the effects of changes and failures
in it.
Items in the tree are related to each other by Boolean operators.
The user is then able to change the state of these items (ON/OFF
FAILED/UNFAILED). The program then evaluates the logic tree based on these
changes and determines any resultant changes to other items in the tree.
CRANS can also search for a common cause for multiple item failures, and
allow the user to explore the logic tree from within the program.
A "help"
mode and a reference check provide the user with a means of exploring an
item's underlying logic from within the program. A commonality check determines
single point failures for an item or group of items. Output is in
the form of a user-defined matrix or matrices of colored boxes, each box
representing an item or set of items from the logic tree. Input is via mouse
selection of the matrix boxes, using the mouse buttons to toggle the state
of the item.
CRANS carries the NASA case number MSC-21845. It was originally released as part of the NASA COSMIC collection.
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