Reliability HotWire

Issue 75, April 2007

Tool Tips

* What's that Weibull++ button doing in my ALTA (and vice versa)?
If you have both ALTA 7 and Weibull++ 7.5 or later installed on your computer, you will see new buttons at the bottom of the Project Explorer. These are the Application buttons, which allow you to switch back and forth between ALTA 7 and Weibull++ 7 quickly and easily.

Thanks to enhanced software integration, a single project now can include ALTAs Standard Accelerated Life Data Analysis Folios and Weibull++s Standard Life Data Analysis Folios, in addition to all of the types of Specialized Folios, Additional Plots, Stress Profiles, Other Tools, Reports and Attachments available in both applications. Simply click the appropriate Application button to switch instantaneously to the desired application and access its analysis tools.

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This new feature is also reflected in the file extensions used by both applications. By default, all projects created in ALTA 7 and Weibull++ 7.5 or later are now saved with the *.rso7 file extension. The software "remembers" which application last saved the *.rso7 file and, if you double-click the file, it will open in the last application in which it was saved. You can still choose to save your project with a file extension specific to the current application if you want to. In ALTA, you can save projects as *.ralp; in Weibull++, you can save projects as *.rwp. Double-clicking a file saved this way will open it in the relevant application.

 For more on the new closer coordination of Weibull++ and ALTA, including information on data transfer from ALTA to Weibull++ and on file import and conversion, please see the Weibull++ 7 User's Guide or the ALTA 7 User's Guide.

* How do I apply a stress factor to a component in a repairable system using BlockSim?
BlockSim allows you to model different stresses on different components by assigning a Duty Cycle to the block in the Block Properties window. Here you can specify the amount of the block's usage as a percentage of the system usage.

For example, a component that operates continuously would have a Duty Cycle of 1. A component with intermittent usage, such as the CD-ROM drive in a computer, might accumulate only ten minutes of usage for every hour the computer operates, and would have a Duty Cycle of 0.167.

You can use this same approach to model a system undergoing different stresses at different times in a Phase Diagram. Simply assign a Phase Duty Cycle to an Operational Phase in the Phase Properties window.

Copyright 2007 ReliaSoft Corporation, ALL RIGHTS RESERVED