Aralia: a Powerful Fault Tree Assessment Engine

Aralia is a computation engine for Boolean risk assessment models (Fault Trees, Bloc Diagrams, Event Trees, ...). Based on the Binary Decision Diagrams technology, Aralia is certainly one of the most efficient tools today available to assess these models.

Aralia Features:

• Numerous basic event probability distributions: constant, exponential, Weibull, periodic-test, ...
• Exact computations of Top Event probabilities.
• Exact computations of Importance Factors (RAW, RRW, MIF, CIF, DIF, ...).
• Time dependent analyses.
• Sensitivity analyses.
• Efficient computation and storage of minimal cutsets and prime implicants.
• Efficient mechanisms for cutset extraction.

Aralia:more than 10 years of experience

Aralia has been first developed by A. Rauzy (LaBRI/CNRS Bordeaux) in the 1990's as part of a partnership between the University and several companies (Cogema, Commissariat à L'Energie Atomique, Dassault-Aviation, Elf-Aquitaine, Electricité de France, Renault, Schneider Electric and Technicatome).

Aralia is developed since 2001 by arboost technologies.

Aralia is calculation engine. It is embedded in the following tools.

• Aralia Workshop: designed by the "Groupe Aralia" and distributed by Dassault Data Services.
• Cecilia-OCAS: designed by Dassault-Aviation and distributed by Dassault Data Services.
• JaGRIF: designed by Total-Fina-Elf and distributed by Dassault Data Services.
• KB3: designed and distributed by Electricité de France (RDSoft).
• RiskMan: designed and distributed by ABS Consulting.
• Fault Tree free: designed and distributed by Mistubishi Heavy Industries and Tepco Systems.
• SimFia: designed and distributed by APSYS.
• TDC FTA: TDC FTA belongs to the methodological TDC Worksuite designed by TDC

More than 1000 licenses of Aralia are used worldwide.

Aralia version 4 is an entirely new version written in C++ by arboost technologies. Aralia version 4 is available as a DLL to be embeded in any soft that performs assessment of Boolean models.

The Aralia Users' Group

The development of Aralia is guided by the Aralia Users' Group. The Aralia Users' Group organizes technical meetings for Aralia users and distributors, sub-groups of interest, ... Since 1991, the "Groupe Aralia", then the Aralia Users' Group, has organized at least two meetings a year.

Articles about Aralia's mathematical and algorithmic foundations can be found on A. Rauzy webpage.

Versions

The current version of Aralia is version 4.4e. You can download it here.

Warning: versions 4.0 suffer from few bugs that have been corrected in version 4.1. They are no longer available on the site. You are strongly encouraged to move to version 4.4.