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isograph

Reliability Prediction Software
Reliability Workbench Version 10.0

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New Features for Reliability Workbench Version 10.0 can be found here.

Download Reliability Workbench Technical Specification

reliability prediction software, bellcore Overview

"The fully integrated environment for reliability and safety analysis"

The Reliability Workbench is an fully integrated reliability prediction software toolkit which includes the following elements:

  • Reliability Prediction
    • MIL-217 F Notice 2
    • Telcordia (Bellcore) TR-332 Issue 6 and SR-332 Issue 1
    • NSWC standard 98/LE1
    • GJB/Z 299B
    • RDF 2000 / IEC TR 62380
  • MTTR Prediction
  • RAC Prism Link
  • FMECA, Process and Design FMEA
    • MIL-STD-1629A
    • QS-9000
    • SAE J1739
    • SAE ARP5580
    • BS 5760
    • EFA Format
    • Commercial Aircraft Format
  • RBD Analysis
  • Fault Tree Analysis
  • Event Tree Analysis
  • Markov Analysis
  • Maintainability

You can now apply all these powerful reliability analysis methods from within a single, fully integrated, program. Isograph's Reliability Workbench now includes the powerful fault and event tree analysis capabilities used by the international reliability community since 1986. You can now automatically generate fault trees from your prediction or FMECA project and share data in this fully integrated environment.

Developed with a state-of-the-art user interface using 32-bit technology. Supported internationally by our experienced technical personnel. You need look no further for your complete reliability analysis software.

reliability prediction method Prediction Methods

The failure rate prediction methods have the same general form, they provide you with a powerful visual interface through which you can select components, define the conditions in which they operate such as the temperature or environmental conditions. The prediction software then carries out the failure rate calculation as defined by the standard and gives you the result. The Telcordia (Bellcore) standard predicts the failure rates for mainly electronic components and is based on research on telecommunications applications. The MIL-HDBK-217 standard predicts failure rates for electronic equipment based on work carried out for the US DoD. The RDF 2000 standard predicts failure rates for electronic equipment based on the reliability data handbook published by UTE (Union Technique de l'Electricite). The NSWC handbook deals with mechanical components and is based on research carried out for the United States Navy.

The components that make up a system can be defined in a tree structure. The tree may be composed entirely of components or it could be subdivided into blocks each of which could hold other blocks or components. In this way you can easily represent your system and sub-systems. The failure rate model for each component is made up of a base failure rate for that particular type of component and multiplying factors known as pi-factors. These factors depend on the operating conditions experienced by the component. You can input these conditions through simple dialogs and life is made even easier by providing default values for the parameters. If you don't like the default values you change them! The failure rates of components are calculated immediately and displayed on the tree diagram. The contributions of components failure rates to blocks and systems failure rates is also displayed. You can examine the effects of stresses caused by the various environmental conditions by displaying the base failure rates and pi-factors for each component.

There many features designed into the prediction methods that reduce the time it takes you to carry out your analysis. You can cut, copy and paste in the diagram to make rapid changes. Commonly used components can be entered once in a library and then pulled into the project tree each time that the component is used. Information can be imported from sources such as CAD packages. You can globally edit the project to carry out 'what if' studies. The powerful reporting and graphing features allow you to create professional standard reports at the click of a button.

fmeca fmea software FMECA

The FMECA module of the Reliability Workbench minimises the time and effort required to undertake and report on a Failure Modes Effects and Criticality Analysis or a Process/Design FMEA. The FMECA module gives you the tools to define your system in terms of a hierarchical diagram. The diagram can be developed in a short time using the visual building features that you now expect such as cut, copy and paste. The failure modes can be assigned directly or you can pull them out of a library containing failure modes and failure rate apportionments. The failure modes can be assigned at any indenture level in the system diagram. You can easily assign effects to failure modes and severity to the effects. The FMECA module can also carry out an automatic criticality calculation. The failure modes can then be ranked in terms of severity and criticality. You can also enter other failure mode data such as detection methods, compensating provisions and failure rates. With so much text entry involved in a FMECA you will be relieved to use the phrase library and reduce your data entry effort. You can easily find your way through the information by using the powerful search facilities. When you come to report on the study, The FMECA module gives you the tools to produce professional documentation.

reliability block diagram software Reliability Block Diagram (RBD) Module

The RBD analysis module provides an analytical solution to reliability problems posed as Reliability Bock Diagrams (RBDs). It can analyse large and complex RBDs and produce a minimal cut set representation and a wide range of quantitative results including unavailability, reliability and expected number of failures. The RBD analysis module also gives you the results of importance and house event analysis.

The creation of your RBD diagram couldn't be simpler. Using 'drag and drop' facilities you can position the blocks and nodes on your diagram. You can then click on the blocks or nodes that are connected and the RBD analysis module will automatically draw the connection lines. You can modify the diagram to your taste by moving the blocks and nodes or using the cut, copy and paste facilities to edit the diagram. The label fonts can be altered locally or globally. A block in a diagram may represent a sub-system that is drawn on another page in the hierarchical scheme. You can even include the RBD diagrams produced by other engineers in your model using the 'Append' facility.

The RBD analysis module offers a range of models for the failure and repair of blocks. You can add the model information to your RBD through simple dialogs. The model options are fixed unavailability, constant rates, dormant and standby. the RBD analysis module gives you the added bonus of an automatic Markov analysis for standby systems. You can also carry out house event and common cause failure analyses. When you come to run your analysis the RBD analysis module will carry out a verification check to make sure that you haven't made any errors such as circular logic or undefined failure models. The analysis will include a full minimal cut set analysis and the calculation of quantitative parameters such as unavailability, unreliability and expected number of failures. Time dependent parameters are calculated through the system lifetime. And even more.. you get the Fussell-Vesely, Birnbaum, Barlow-Proschan and sequential importance measures.

report import export Fault and Event Tree Module Features

  • Integrated Fault and Event Tree Analysis

    The Fault and Event Tree Modules of Reliability Workbench provide a fully interactive graphics and analysis environment for performing probabilistic risk assessment using integrated fault tree and event tree analyses. Reliability Workbench is capable of analysing large and complex fault and event trees producing the full minimal cut set representation for fault tree TOP events and event tree consequences.

  • Fault and Event Tree Construction
    • Standard Windows dialogs, menus and controls for easy function access and layout
    • Automatic drawing facilities produce high quality diagrams without any effort from the user
    • Time saving features such as double mouse clicks to bring up gate, event and branch attributes
    • Drag and drop add mode for fast tree construction
    • Extensive diagram scale and shift options including manual shifting of sub-trees and automatic alignment to the screen edit area
    • Global and local font selection allowing highlighting of labels and descriptions
    • Automatic paging facilities - simply identify gates or branches with a new page tag and the program takes care of pagination
    • Append facilities for fault trees produced by different users
    • OR, AND, VOTE, NOT, Exclusive Or, Inhibit and Priority AND gates supported
    • Basic, Conditional, Undeveloped, Dormant and House basic event symbols supported
    • Multiple branching supported for event trees
    • Extensive on-line help facility including key word search
    • Attributes such as event parameters, generic model codes, branch names and column probabilities may be displayed on diagrams if required
    • Cut, copy and paste facilities available for fault tree symbols
    • Flexible label formatting allows the user to place descriptive text anywhere within a fault or event tree page
    • Project database tables may be easily edited using direct and dependency filtering
    • Event and gate names may be globally edited
    • Circular logic checks during fault tree construction
    • Import and export facilities for data models
    • Undo and automatic backup facilities
    • Delete hidden data facility for tidying-up large projects
    • Event and Model Grouping. Categorise events or generic failure models in the project tree control.
    • Global editing of inspection intervals. Modify inspection intervals for a group of events or generic failure models in one go.
    • Navigate Fault Tree Page Structure. The fault tree page structure may be displayed as an option to allow easy navigation up and down the page hierarchy.
    • Sequential Failure Model Improved. The sequential failure model now operates on high order cut sets with more than one sequential model group.
    • Individual Gate Modularisation. Individual gates may now be selectively modularised.
    • Gate Input Ordering. Gate inputs may now be displayed in any order specified by the user.
    • Page Ordering. Printed fault tree pages may now be printed in the specific order requested by the user.
    • Diagram Metafiles. Fault tree diagrams may now be exported directly to Windows Metafiles.
    • Project Conversion. Version 9 projects may be converted to version 7 or 8 projects.
    • Change Gate to Event. Gates may be quickly changed to events and vice versa.
  • Fault and Event Tree Analysis

    The Reliability Workbench Fault Tree Module provides CCF analysis, importance analysis, uncertainty and sensitivity analysis facilities. The program allows users to construct a single project database containing generic data and event tables, fault trees with multiple TOP events, event trees originating from different initiating events, CCF tables and consequence tables. Fault and event tree pagination is automatically controlled by the program. Fault tree TOP events may be used to represent specific nodes in the event tree. Multiple branches are also handled to allow for partial failures. The Reliability Workbench Fault Tree Module uses efficient minimal cut set generation algorithms to analyse large and complex fault and event trees. NOT logic may be included in the fault and event trees at any level and event success states retained in the analysis results as an option.

    • Range of event failure and repair models including fixed rates, dormant, sequential, standby and initiator failure models
    • Fault tree house event analysis
    • Full minimal cut set analysis (including success states if required)
    • CCF analysis using the beta factor, MGL, alpha factor or beta BFR methods
    • Post-processing facilities for accurate upper bound calculations
    • Importance analysis with Fussell-Vesely, Birnbaum, Barlow-Proschan and Sequential importance measures. Weighted values provided for event tree consequences
    • Initiator-enabler analysis for sequence dependent analyses
    • Uncertainty analyses allowing confidence levels to be determined from event failure and repair data uncertainties
    • Sensitivity analysis allowing the automatic variation of event failure and repair data between specified limits
    • Time dependent analysis providing intermediate values for time dependent system parameters
    • Verification checks providing diagnostic information before commencing an analysis. Checks are made for circular logic, undefined gates, invalid initiators etc.
    • Status facility to indicate whether analysis results are out of date with respect to project data
    • Integrated Markov analysis capability. Link simple or complex Markov models to events in the fault or event tree diagram.

report import export Reports, Import/Export

Reliability Workbench includes the latest version of the report generator and import/export wizard. The report generator provides you with standard reports containing tabular data, graphs or diagrams. You can also customise your own reports in next to no time! You can print out the reports directly or export them to a Rich Text Format file. Many software packages such as Microsoft Word can read RTF files allowing you to include the reports in other documents.