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Tool Tips: Minimal Cut Sets in BlockSim, MultiPlots and Saving Plots in Lambda Predict 3

Reliability HotWire

Issue 99, May 2009

Tool Tips

* How can I get more information about the minimal cut sets for my BlockSim diagram?

Minimal cut sets are all the unique combinations of component failures that can cause system failure. Beginning with version 7.0.7, BlockSim offers additional options for displaying minimal cut sets.

Choose Tools > Show Cut Sets. The Cut Sets Settings window will appear, as shown next.

In the Sort by area, select the criterion you want to sort the cut sets by. You can select:

  • Size: Cut sets will be shown in ascending order based on the number of blocks they contain.
  • Reliability or Unreliability: If you select either of these options, you must specify a time at which the reliability or unreliability is calculated. The cut sets will be shown in ascending order of reliability or unreliability.

In the Number of Cut Sets to Display area, you can select to display all cut sets or specify the number of cut sets that will be shown.

In the Other Options area, you can select the additional information that will appear in the minimal cut sets display, including:

  • Display Settings: If selected, the Diagram name and a summary of the settings chosen in the Cut Set Settings window will appear at the top of the cut sets display.
  • Display Number of Blocks in Cut Sets: If selected, the number of blocks in each cut set will be shown in parentheses after the set number, as shown next.

You can change these settings by clicking the Settings button in the Cut Sets window toolbar to return to the Cut Sets Settings window.

* How can I plot multiple items together in Lambda Predict 3? Can I save my plots?

You can plot a single system or block and all of its sub-items directly from the System Hierarchy panel in Lambda Predict 3 just click the item you want to use as the top level item in the plot and then choose Tools > Plot or click the Plot icon.

There may be other times when you want to plot data for more than one system in a prediction, or for just some of the blocks within a system. To create a plot with multiple top level items, choose Project > Add Plot or right-click the project's Stored Plots folder in the Project Explorer and choose Add Plot on the shortcut menu that appears. The Select Top Level Items to Plot window will appear.

At the top of the window, choose the prediction that you want to create the plot for. All systems and blocks in the prediction will be displayed below. Select one or more system(s) and/or block(s) to be used as the top level item(s) in the plot.

You have the option to save any of the plots that you create within Lambda Predict, which allows you to keep the plots with the project and return to them when needed. When working with plots created from within the System Hierarchy panel, simply click the Save icon.

When working with a plot created from the Project Explorer, you will automatically be prompted to save the plot. Saved plots will be accessible from the Stored Plots folder in the Project Explorer. After being saved for the first time, plots will be saved automatically each time they are closed.

If you make changes to the prediction associated with a plot, the plot will not reflect those changes until it is refreshed. The plot status light in the upper right-hand corner of the plot Control Panel will be red in this case, indicating that the plot does not reflect the current status of the items within it.

If you delete a prediction that is referenced by a stored plot, the plot will remain available, but you will not be able to make any changes to it.

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