FaultTree+™ in Isograph's Reliability Workbench™ is a powerful
systems reliability analysis tool containing integrated Fault Tree,
Event Tree and Markov analysis features. It can also be used in
conjunction with Prediction, FMECA and RBD modules within
Reliability Workbench™. Fault tree, Event tree and Markov diagrams
can be created very quickly. Automatic drawing facilities are used
to create professional diagrams.
FaultTree+™ in Isograph's Reliability
Workbench™ includes three modules:
- Fault Tree Analysis. Allowing you to
construct and analyse fault tree diagrams.
- Event Tree Analysis. Event trees allow
you to analyse the possible outcomes of an event occurring.
- Markov Analysis. Enabling the
construction of Markov models for components with large
Features of FaultTree+™:
- Intuitive interface enables fast creation of fault tree, event
tree and Markov diagrams
- Enterprise facilities for large-scale collaboration and version
- Robust minimal cut set algorithm with NOT logic
- Choice of quantitative solution methods - rare, Esary-Proschan
- Integrated fault and event tree analysis for Probabilistic Risk
- Markov models can be integrated into component failure
- Dynamic (sequential) and disjoint failure models
- Common cause failure, importance, phased-mission, uncertainty
and sensitivity analysis
- IEC 61508 failure models
- Integrated parts libraries with data for electronic and
- Customisable reports with output to Word® and PDF
- Import and Export facilities to delimited text formats,
Office®, SQL Server® and Oracle®
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
What is Markov Analysis?
Markov analysis provides a method of analysing 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 analysed independently of the fault
It can efficiently solve fault trees of the order of 20,000
gates and 20,000 basic events, using world class analytical