Reliability HotWire: eMagazine for the Reliability Professional
Reliability HotWire

Issue 7, September 2001

Tool Tips
How do I remove the Program ID from the plots in Weibull++ and ALTA?
The Program ID appears in the upper left corner of plots in Weibull++ and ALTA, and contains information about the software and ReliaSoft. The option to turn this feature on or off can be found on the Plot page of the User Setup window. Select User Setup from the File menu then click the Plot tab.

Plot page of the Weibull++ User Setup

If the Print Program ID on Plot option is not selected, the Program ID will no longer appear in your plots.

Is there a quick way to specify stress profiles in ALTA 6 PRO?

With the cumulative damage life-stress relationship selected in ALTA 6 PRO, when you right-click the cell in the stress column for the data point of interest, a stress profile dialogue will open.

Assigning a Stress Profile in ALTA 6 PRO

This box allows you to scroll down and select from any of the available stress profiles in the attached stress library. Select a stress profile from the list and click Add. To open the Stress Profile Explorer, click the icon in the lower right corner of the dialogue box. Note that this feature is available only with the cumulative damage model in ALTA 6 PRO.

Can I have circular references in my RBD in BlockSim?
Circular references are not allowed in BlockSim. The software uses a methodology called the Path Tracing Method in order to evaluate the reliability of the system in the RBD. The Path Tracing Method requires that each RBD has one starting block and one ending block. It then calculates all of the "paths" from the starting block to the ending block that would allow the system to function. For this reason, circular references are not allowed, as it would result in an infinite number of paths through the system.

In some circumstances, it may be possible to work around the problem of circular references by splitting blocks, or creating an input block and an output block, which represent two different functions of the same component. In the RBD below, Com Line 3 and Com Line 6 have two blocks each, representing their input and output functions.

BlockSim Reliability Block Diagram with Circular References Workaround

 

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