Fault Tree Analysis

Fault tree analysis is a powerful analytical technique that you can use to "deep dive" a particular potential reliability or safety issue. In contrast to failure mode and effects analysis, which uses inductive reasoning to identify potential failure modes and their effects, fault tree analysis uses deductive reasoning to identify the fault events, modes and causes that will result in a given effect. Fault tree analysis can also consider multiple concurrent failure modes, or even failure modes that must occur in a given sequence to produce the end effect of interest.  In addition, fault trees can be easily quantified using Boolean algebra to determine the estimated likelihood of the end effect, or the fault tree's "top event".

With fault tree analysis, you can quickly identify all failure modes and causes that will contribute to the end effect of interest, and avoid considering "non-critical" failure modes. As a result, fault trees are commonly used to evaluate system safety issues, and also to consider key operational reliability issues such as undetected production of defective parts.

Fault tree analysis is also quite useful as a root cause investigative tool. When confronted with a problem or symptom, you can use fault tree analysis to quickly identify all potential causes of the problem, and even estimate the likelihood that any given cause is responsible for the problem you're trying to solve!

Fault tree analysis uses a set of graphical symbols to represent the logical and mathematical relationship between events and their lower level inputs or causes.

Quickly and Accurately Develop and Analyze Both Fault and Event Trees.

Relex Fault Tree provides a powerful, friendly, and flexible method of performing fault tree analysis.  With the Relex Fault Tree package, you can conveniently create complete fault trees and perform fast and accurate calculations.  Using just a few mouse clicks, you can enter gates and events, and assign their properties. When done, you can compute the probability of the top event and determine which events are most likely to cause the top undesirable event.

Relex also provides, as part of the Fault Tree package, a full-featured event tree tool!

Analyze  Your System Safety Using Relex Fault Tree

With the Relex Fault Tree package, you can conveniently create complete fault trees and perform fast and accurate calculations.

Using just a few mouse clicks, you can enter gates and events, and assign their properties. When done, you can compute the  unavailability of the top event and determine which events are most likely to cause the top undesirable event.

Relex  Fault Tree is Integrated with Other Relex Modules

One  of the primary benefits of using Relex Fault Tree is that it is automatically linked with the rest of the Relex product line. You can quickly drag and drop  failure modes from Relex FMEA, or individual components and assemblies from  Relex Reliability Prediction, into your fault tree. You can also drag a fault tree and make it a part of an RBD. Because of linking, any information modified in one Relex module is automatically updated in associated modules.

In addition, Relex can automatically generate a complete fault tree from your FMEA. This allows you to visually determine which failure modes contribute to an end effect.

With Relex, Drawing a Fault Tree is Virtually Effortless

All  you have to do to create a fault tree is point and click. On the toolbar, point to the type of gate or event that you want, then click your mouse where you want to place it. Relex will automatically take care of all connections and  alignments. 

You  can customize the appearance of your fault tree by assigning fonts, font sizes, colors and bitmaps. You can enter up to 1,000 characters in your descriptions. And, you can prune and graft individual events or entire tree branches by just copying and pasting.

One of the many unique capabilities of Relex Fault Tree is the simultaneous display of the fault tree in a standard view as well as a table view. The expandable/collapsible table view facilitates the viewing and editing  of the properties of the various gates and events, as well as editing large  trees.

Powerful Calculations

Relex  Fault Tree supports many different types of gates and events. Gate types include  OR, AND, NOR, NAND, NOT, XOR, Voting (k/n), Remarks, Inhibit, and Transfer. In addition, Priority AND gates, where the inputs are order dependent, are supported with the use of Markov modeling. Event types include Basic, House, and Undeveloped. Event data can consist of failure and/or repair data, constant  probability data, failures with periodic inspections, and more. Relex is also compatible with common cause failures using the Beta, MGL, Alpha, and BFR  models. Additionally, support is provided for repeated events.

Relex  Fault Tree includes a host of powerful calculations for both qualitative and  quantitative analyses. The Minimal Cut Set (MCS) engine quickly determines the  minimal cut sets and provides the capability to view them on your fault tree diagram. You can calculate the unreliability, unavailability, frequency of failures, and number of failures. You can compare the relative importance of  various events using the Birnbaum, Criticality, and Fussell-Vesely methods. And, you can perform time-dependent analyses and get an array of scientific graphs of your results.

If your fault tree is very large, you may wish to approximate the results of your analysis in order to improve calculation speed without adversely affecting  accuracy. You achieve this by limiting all cut sets below a certain probability  or using the cut set summation, cross product, or Esary Proschan methods.

As with all Relex modules, Relex Fault Tree is based on an intuitive, easy-to-use visual interface. With Relex Fault Tree you get a tremendously powerful calculation package wrapped in a Relex trademark flexible  interface.

Relex Fault Tree Features

   Automatically links with reliability predictions, FMEAs, and RBDs

   Friendly and flexible interface allows fast generation of fault trees

   Automatically creates fault trees from FMEA

   Includes fast MCS algorithm

   Supports numerous gate and event types

   Supports exact and approximate solutions

   Computes importance measurements

   Supports common cause failure modeling and time-dependent analyse

Create Event Trees for Your Project File

Analyze  Possible Outcomes Using Relex Event Tree

With the Relex Event Tree package, you can conveniently create complete event trees and perform fast and accurate calculations. Using just a few mouse clicks, you can define branches (events) and assign their properties. When done, you can easily compute the probability of all the possible outcomes  defined in the event tree, as well as those for the events leading up to them.

The goal of an event tree is to determine the  probability of an event based on the outcome of each event and the chronological  sequence of events leading up to it. By analyzing all possible outcomes, you can  determine the percentage of outcomes which lead to the desired result.

Relex  Event Tree is Integrated with Other Relex Modules

One of the primary benefits of using Relex Event Tree is that it is automatically linked  with the rest of the Relex product line. You can easily reference values  from other Relex modules like Relex Fault Tree and enter them into the event tree calculations. Because of linking, any information modified in one Relex  module is automatically updated in  associated modules.

Relex  Provides a Friendly User Interface for Event  Trees

All  you have to do to create an event tree is point and click. Double-click the mouse onto an existing branch to modify its properties. Right-click the mouse on  an existing branch to insert subsequent branches, or link the branch to data in another Relex module. Click on the buttons in the column headings to define the  column properties, insert or delete columns. You can even span complex event  trees across multiple pages for ease of viewing on screen and in  print.

As with all Relex modules, Relex Event Tree is based on an intuitive, easy-to-use visual interface. With Relex Event Tree you get a tremendously powerful calculation package wrapped in a Relex trademark flexible  interface.

Relex Event Tree Features

   Automatically links with fault trees, reliability predictions, FMEAs and RBDs

   Friendly and flexible interface allows fast generation of event trees

   Supports multiple branch classifications 

   Supplied with Relex Fault Tree at no additional charge

Learn More About Relex Fault Tree

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