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To add a diagram in Weibull++/ALTA, choose Insert > Tools > Diagram or right-click the RBDs folder in the current project explorer and choose Add Diagram on the shortcut menu.
To add blocks to a diagram, choose Diagrams > Diagram Tools and then select the type of block you wish to add.
Add Block adds a standard
block that represents a data sheet in a Weibull++ or ALTA standard folio.
You can also add a standard block by dragging the data sheet of interest
from the Data Sheets page of the control panel into the diagram. You can
use any data sheet in any Weibull++ or ALTA standard folio, as long as
it has been calculated and is not using one of the competing failure modes
distributions. (A red flag over a block indicates that the associated
data sheet in the Weibull++ or ALTA standard folio has either been deleted
or needs to be calculated.)
By default, standard blocks are named after the data sheets they represent. If you want to use a different name, right-click the block and choose Rename Block.
Add Node adds a node
block that functions like a switch that diagram paths move through. A
node block models an alternative form of redundancy known as k-out-of-n
redundancy. A k-out-of-n node block can have n
paths leading into it and requires that k
out of n paths must function
for the system to function. There must be at least one path leading into
a node; therefore, a node block cannot be placed as the starting block
for a diagram.
Double-click the node block to specify the number of paths that must reach the node in order for the system to succeed.
Add Junction adds
a junction block, which is a non-failing block. Because diagrams must
flow from a single starting point to a single ending point, you may need
to use junction blocks as starting and/or ending blocks (see Diagram
Analysis Constraints). They can also be used anywhere within the diagram
that you need a block that does not fail (i.e., does not affect the system
reliability).
Once you have added blocks to the diagram, you can then use connectors to connect the blocks and build the RBD. From the RBD, you can calculate the exact system reliability equation for the system, and obtain plots and results based on that equation.
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