Analytical Plots

Plots can be created and viewed by clicking the Plot icon located on the Analytical page of the control panel for each diagram.

If you click the Plot icon before the diagram has been analyzed, it will automatically be analyzed and then the data will be plotted in the plot sheet. (Note that the Plot icon on the Plot sheet control panel refreshes the plot. If data or analysis settings have been changed since the diagram was last analyzed, you must reanalyze the data before refreshing the plot.)

You can add additional plot sheets to the diagram by right-clicking the sheet index tabs at the bottom of the window and choosing Insert Analytical Plot on the shortcut menu. You can delete a plot sheet from the diagram by selecting the plot sheet, right-clicking and choosing Delete Plot.

System plots display information about the entire system.

Unreliability vs. Time shows the unreliability of the system over time. The unreliability value provides the probability that the event (failure) will occur by a specific time.
Reliability vs. Time shows the reliability of the system over time.
pdf Plot shows the system’s probability density function, which illustrates the behavior of the life distribution function. Direct probability or reliability values cannot be read from this plot. The area below the plotted line, starting at time zero and ending at the value on the x-axis, is the probability of failure by that time.
Failure Rate vs. Time shows the system’s failure rate over time. The failure rate is the number of failures occurring per unit time.

Metrics plots display information about the reliability importance of the blocks in the system.

RI vs. Time shows the reliability importance of the blocks in the system over time. Reliability importance is a measure of the relative importance of each component in a system with respect to the overall reliability of the system.
Static RI shows the static reliability importance of a specified number of blocks in the system at a specific time. To view this plot, you must specify the time at which the reliability importance is calculated and the number of blocks to display. The plot will show the blocks with the highest reliability importance (e.g., if you specify to show five blocks, the plot will show the five blocks with the highest reliability importance). Point to a bar to view the block’s name, reliability and calculated importance. Blocks with the highest reliability are shown in green, blocks with medium reliability are shown in yellow and blocks with the lowest reliability are shown in red.
Static RI Tableau shows the static reliability importance of the blocks in the system at a specific time in tableau format. To view this plot, you must specify the time at which the reliability importance is calculated. The block name appears on each area of the plot. Point to a plot area to view the block’s name, reliability and calculated importance. Blocks with the highest reliability are shown in green, blocks with medium reliability are shown in yellow and blocks with the lowest reliability are shown in red.

Blocks plots display information about the individual blocks that make up the system.

For blocks plots, when you first select the plot, you must specify which blocks to include by using the Available Blocks area of the control panel to select which blocks to view. You can also view the corresponding system values by selecting the Show System check box.

Block Unreliability shows the unreliability of the selected blocks plotted against time. The unreliability value provides the probability that the event (failure) will occur by a specific time.
Block Reliability shows the reliability of the selected blocks plotted against time.
Block pdf shows the probability density function of the selected blocks plotted against time.
Block Failure Rate shows the failure rate over time of the selected blocks plotted against time. The failure rate is the number of failures occurring per unit time.

Note that confidence bounds are available for the Unreliability vs. Time, Reliability vs. Time and Failure Rate vs. Time plots in cases where all blocks that can fail in the diagram use models that have Fisher matrix bounds. To have Fisher matrix bounds, a model must have been created by publishing from a data source, such as a Weibull++ or ALTA data sheet, that was calculated using Fisher matrix bounds. Additionally, bounds are not available if the diagram has containers, subdiagrams or mirrored blocks, or if any block uses the cumulative damage model. Where applicable, you can add confidence bounds to a plot by choosing Plot > Confidence Bounds > Confidence Bounds.