ARTIS - Fault Tree Analysis

ARTIS applies all of the availability modelling definitions to fault tree analysis, by replacing ‘capacity’ and 'production', on a continuous scale, by ‘mission’, on a binary scale. This gives rise to a set of definitions of well established terms like 'mission reliability' and 'mission criticality' that is consistent with common practice in fault tree analyses.

The large advantages of using the availability modelling approach to carry out fault tree analyses are the ease, transparency and efficiency of modelling and the automated generation of the results with the hierarchy of criticality rankings and minimum cut sets. These features also provide a convenient basis for carrying out, and building on, failure mode, effect and criticality analyses (FMEA, FMECA).

A production availability model can be interpreted as a success tree by:

A success tree is logically equivalent to a fault tree by de Morgan's theorem. The top event of the fault tree represents the set of system states with capacity 0 in the availability model. The cut sets are the minimum sets of downtime events of all these system states.

You can try out ARTIS V2.2 with any recent Firefox, Chrome, Safari or Opera web browser by touching, tapping or clicking the image below; this will open the demonstration model on a new page in your browser and you can start the trial from there. ARTIS does not use any plug-ins or add-ons but you will need to use a recent browser version, with Javascript enabled.

The ARTIS V2.3 user interface, showing the fault tree analysis demonstration model.

After opening the demonstration model, the quick route to do a run is:

The model is based on a NASA training course, as described here .

You might save the demonstration model on your own computer (using your browser's "save as web page, complete") and continue from there to build your own model. For further guidance, please refer to the ARTIS wiki .

For commercial use, SecuoS offers both short- and long term service agreements.

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