Introduction To FaultTree in Reliability Workbench

FaultTree+, the world’s most popular fault tree analysis software package, has been incorporated into Reliability Workbench since version 11. There are many benefits of FaultTree+ being integrated into Reliability Workbench. You can read more about the other Reliability Workbench modules on their appropriate pages.

The Reliability Workbench FaultTree+ (and FMECA) modules have been tested and certified by SGS-TÜV as suitable for safety analyses according to ISO26262.

What's in FaultTree+?

FaultTree+ in Reliability Workbench includes three modules:

  • Fault Tree Analysis. Allowing you to construct and analyze fault tree diagrams.
  • Event Tree Analysis. Event trees allow you to analyze the possible outcomes of an event occurring.
  • Markov Analysis. Enabling the construction of Markov models for components with large interdependencies.

What is Fault Tree Analysis?

Fault tree diagrams represent the logical relationship between sub-system and component failures and how they combine to cause system failures. The TOP event of a fault tree represents a system event of interest and is connected by logical gates to component failures known as basic events.

After creating the diagram, failure and repair data is assigned to the system components. The analysis is then performed, to calculate reliability and availability parameters for the system and identify critical components.

What is Event Tree Analysis?

Event tree diagrams provide a logical representation of the possible outcomes following a hazardous event. Event tree analysis provides an inductive approach to reliability and risk assessment and are constructed using forward logic.

FaultTree+ in Reliability Workbench includes integrated event tree analysis. The event tree model may be linked to the fault tree model by using fault tree gate results as the source of event tree probabilities.

What is Markov Analysis?

Markov analysis provides a method of analyzing the reliability and availability of sub-systems representing components with strong interdependencies. Markov analysis is often used to model dependencies such as:

  • Components in Warm/Cold Standby
  • Common maintenance personnel
  • Common spares with a limited on-site stock

FaultTree+ in Reliability Workbench allows the user to construct Markov models for use as the source of basic event data. The Markov models may also be analyzed independently of the fault tree analysis.

Features of FaultTree+

Isograph has built its reputation on the efficiency, accuracy, stability and ruggedness of its FaultTree+ product. This is why there are thousands of FaultTree+ installations world-wide that are currently being used on major projects in industries as varied as aerospace, defense, automotive, nuclear, rail, chemical process plant, oil & gas and medical amongst many others.

It can efficiently solve fault trees of the order of 20,000 gates and 20,000 basic events, using world class analytical methods.

On top of this, the user-friendly interface allows simple creation or adaptation of projects.

ISO 26262 Certification

Isograph’s world leading reliability software is used widely in the Automotive industry for ISO26262 compliant safety analyses.

Our Reliability Workbench FaultTree+ and FMECA modules have been tested and certified by SGS-TÜV as suitable for safety analyses according to ISO26262.

Reliability Workbench ISO 26262 Certificate