Sociology Index

Fault Tree Analysis

First developed in the 1960's, the fault tree analysis was first introduced by Bell Laboratories and is used in system reliability, maintainability and safety analysis. By using Pareto Analysis, we can prioritize the individual changes that will most improve the situation. Fault Tree Analysis techniques have been readily adopted by a range of engineering disciplines for performing reliability and safety analysis. Fault tree analysis is a top-down approach to failure analysis, starting with a potential undesirable event (accident) called a TOP event, and then determining all the ways it can happen. caused by individual or combined lower level failures or events.

Fault Tree Analysis may be used to analyse large and complex systems. Fault Tree Analysis is extremely useful in analysing redundancy arrangements. Fault trees and Fault Tree Analysis are meant to graphically represent the interaction of failures and other events within a system. Events at the bottom of the fault tree are linked via logic symbols (gates) to one or more events at the TOP.

In Fault Tree Analysis TOP events represent identified hazards or system failure modes for which predicted reliability data is required. Fault tree analysis is a top-down, deductive failure analysis in which an undesired state of a system is analyzed using Boolean Logic to combine a series of lower-level events. Events at the bottom of the fault tree generally represent component and human faults for which statistical failure and repair data is available. Typical events at the botom (basic events) include Pump failure and Operator does not respond.

Fault tree analysis is also used in software engineering for debugging purposes and is closely related to cause-elimination technique used to detect bugs. Typical TOP events iclude Safety system unavailable and Total loss of production.

FaultTree+ an Isograph FaultTree+ computer program allows you to perform fault tree analysis in an integrated environment. The program also provides event tree and Markov analysis capabilities.