Reliability HotWire: eMagazine for the Reliability Professional
Reliability HotWire

Issue 56, October 2005

Tool Tips

* What is new about Weibull++ 7's MDI and how can it be used to add and manage project items?

Every time you begin a new session in Weibull++ 7, the first window you will encounter is the Multiple Document Interface (MDI). The MDI is the manager for Weibull++ 7. It contains the windows you create in a project. The next figure shows the MDI of Weibull++ 7 and its components. The appearance of the MDI will vary depending on the window(s) that are currently open and the configuration settings of the Project Explorer.

[Click to Enlarge]

The MDI serves as the container for the Project Explorer, all Standard Folios, Specialized Folios (i.e. Warranty Analysis, Degradation Analysis, Event Log, Non-Parametric Life Data Analysis, Non-Parametric Recurrent Event Data Analysis and Parametric Recurrent Event Data Analysis Folios), Additional Plots, Diagrams, Other Tools (i.e. Non-Linear Equation Fit Solver and SimuMatic), Reports and Attachments and manages the different active windows. The MDI remains open until you close the program. Closing the MDI has the same effect as terminating the program.

Standard Folios and Specialized Folios can be created, when starting Weibull++ 7, by making a selection in the Project Wizard.

They can also be created by selecting Add Standard Folio or Add Specialized Folio from the Project menu.

Diagrams, Reports, Aditional Plots (MultiPlot and Side-by-Side) and Other Tools (i.e. Non-Linear Equation Fit Solver and SimuMatic) can also be added by making the appropriate selection from the Project menu.

* How can Weibull++ 7 be used to perform failure and repair analysis based on event logs?

Weibull++ 7 now provides a specialized folio, called the Event Log Folio, designed specifically to capture data in an event log format (commonly used in the Machine Tools and other industries). This data entry sheet captures the type of event, the date/time when the event occurred and the date/time when the system was restored to operation. Weibull++ then converts this information to time-to-failure and time-to-repair data that can be analyzed with life data analysis techniques. The folio provides a number of options to tailor the analysis to fit your particular requirements, including the ability to define shift patterns, consider unique system IDs, perform the analysis at the system, subsystem, assembly or component level, etc. You can also export the results to BlockSim for system reliability, maintainability and availability analyses.

You can add an Event Log Folio to an existing project by selecting Add Specialized Folio then Add Event Log from the Project menu.



To use the Event Log Folio, first specify the Start Date/Time and End Date/Time for the system in the Control Panel. In the Data Sheet, enter the required data set in the corresponding columns. The System column identifies the system that experienced each event. This column is displayed only if Allow System column is selected on the Other page of the Control Panel; otherwise, all components are assumed to belong to the same system. The F/E column indicates whether the occurrence was a failure (F) or an event (E). The Date/Time Occurred/Restored columns allow you to specify the exact date and time of the occurrence and the date and time when the system was restored. The Level columns indicate the component, sub-component, etc. that was responsible for the failure or event. If any of the components accumulate age when the system is down for any reason other than their own failure, you can indicate this with a Y in the OTF (Operates Through other Failures) column. This column is displayed only if Allow OTF column is selected on the Other page of the Control Panel; otherwise, all components are assumed to be down when the system is down. Note that the entry in this column must be consistent for the same component throughout the data set. The Description column allows you to enter a description of the failure or event. At minimum, data must be entered in the F/E, Date Occurred, Time Occurred, Date Restored, Time Restored and Level I columns.


Next, use the Shift Pattern window to specify the days and times when the system is operating. The Shift Pattern window can be accessed by clicking the Shift Pattern icon or choosing Set Shift Pattern from the Data menu.


Finally, use the Control Panel to specify the desired analysis settings and click the Calculate icon or select Calculate from the Data menu to calculate the failure and repair distributions for the data set. To view the results in the Results Panel, click the Show Analysis Summary button [...]. To transfer the life data to a Standard Folio, select Transfer Life Data to Selected Folio(s) or Transfer Life Data to New Folio from the Data menu or click the corresponding icon. To export the results to BlockSim (if it is installed on your computer) for system reliability, maintainability and availability analyses, select Transfer to BlockSim from the Data menu or click the corresponding icon.


Chapter 14 in the Weibull++ 7 User's Guide provides more information on the Event Log Folio.


* Where can Weibull++ 7 examples and case studies be found?

From the Help menu in Weibull++ 7, click on Open Example Folder. The examples are categorized by area:

  • Standard Folios
  • Specialized Folios, including Degradation, Event Log, Non-Parametric LDA, Non-Parametric RDA, Parametric RDA and Warranty
  • Diagrams
  • Folios Using Reports
  • Other Tools, including Simulation

Some examples have attached Word documents that explain the example and the steps followed to perform the analysis. These documents can be accessed under Attachments in the Project Explorer.

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