Search results
Results from the WOW.Com Content Network
A fault tree diagram. Fault tree analysis (FTA) is a type of failure analysis in which an undesired state of a system is examined. This analysis method is mainly used in safety engineering and reliability engineering to understand how systems can fail, to identify the best ways to reduce risk and to determine (or get a feeling for) event rates of a safety accident or a particular system level ...
NASA Fault Tree Assessment handbook MIL-HDBK-2155, Failure Reporting, Analysis and Corrective Action Taken , U.S. Department of Defense MIL-HDBK-502A, Product Support Analysis, U.S. Department of Defense Archived 2013-12-24 at the Wayback Machine
An RBD may be converted to a success tree or a fault tree depending on how the RBD is defined. A success tree may then be converted to a fault tree or vice versa by applying de Morgan's theorem . To evaluate an RBD, closed form solutions are available when blocks or components have statistical independence .
A fault tree diagram. Fault trees are a logical inverse of success trees, and may be obtained by applying de Morgan's theorem to success trees (which are directly related to reliability block diagrams). FTA may be qualitative or quantitative. When failure and event probabilities are unknown, qualitative fault trees may be analyzed for minimal ...
Layers of protection analysis (LOPA) is a technique for evaluating the hazards, risks and layers of protection associated with a system, such as a chemical process plant. . In terms of complexity and rigour LOPA lies between qualitative techniques such as hazard and operability studies (HAZOP) and quantitative techniques such as fault trees and event trees.
[2] [3] In 1966 NASA released its FMECA procedure for use on the Apollo program. [4] FMECA was subsequently used on other NASA programs including Viking, Voyager, Magellan, and Galileo. [5] Possibly because MIL–P–1629 was replaced by MIL–STD–1629 (SHIPS) in 1974, development of FMECA is sometimes incorrectly attributed to NASA. [6]
A root cause analysis identifies the set of multiple causes that together might create a potential accident. Root cause techniques have been successfully borrowed from other disciplines and adapted to meet the needs of the system safety concept, most notably the tree structure from fault tree analysis, which was originally an engineering technique. [7]
In addition to these objects, SAPHIRE has a unique feature known as “table events” that allows the user to group up to eight basic events together on the fault tree graphic, thereby compacting the size of the fault tree on the printed page or computer screen. All of these objects though represent traditional static-type Boolean logic models.