Fault Tree Analysis

(available in all extension stages of IQ-Software)

For detailed predictions about the failure probability of a system a fault tree analysis is required. APIS IQ-Software supports fault tree analysis according to DIN 25424.

Fault trees are most easily created based on failure nets. A failure net is transformed to a fault tree by changed, inserting or removing logic gates. It is also possible to create a fault tree without any preexisiting failure net.

Based on the above failure net the IQ software creates the following Fault Tree.

If necessary, the gates can be changed. A possible result could be as follows:
Figure. Changed Fault Tree

The evaluation of the information in a fault tree according to DIN 25424 produces values for unavailability and frequency of failure.

The display of the fault tree as a minimal cut set is also possible.

The values which are the basis for the calculation are input in the properties dialogue.

In addition, APIS IQ-Software offers a fault tree analysis based on fault rates in ppm values.