MTS Fatigue Analyzer User Manual
Page 91
Signal to Variable Mapping
The Signal to Variable Mapping part of the window allows you to map signals to variables.
Four types of data can be calculated for each signal that is selected for data acquisition. The data types are:
•
Mean
•
Minimum
•
Maximum
•
Array
The application only calculates data for a signal if it is mapped to a variable.
To see the variables that are available to map, click the drop-down button. If the Filter variables by dimension
and calculation type check box is selected, the variable list includes only the variables with the same
dimension and calculation type as the signal. If the check box is clear, all variables appear in the list.
If a variable is mapped to signal data, the data is calculated during the test run for those cycles that are
selected or defined in the properties for the Data Acquisition activity. The data values for each acquired
cycle are available for use in the runtime display and are saved for post-test analysis.
Default mapping
To automatically create new variables (if the defaults do not already exist) for selected signals and map them
to the correct signal data calculations, click the Use Default Variables button. The name of each variable is
the combination of the signal name and calculation name. The application also copies the new variable
definitions to the Variables tab.
Alternative user variable mapping
Alternatively, you can map a user-defined variable to any signal data calculation. The variable you map must
have a dimension that matches the signal data.
You cannot map a variable to a signal data calculation if the variable already contains a calculation. However,
variables that contain a calculation may optionally be used in the Additional Variables to Calculate panel.
Additional variables to calculate
The Available Calculations panel lists variables that have a calculation. The calculations in the Selected
Calculated Variables panel are performed on those variables when the Data Acquisition activity is performed
in the test procedure. The data from the calculation is available for runtime display and for post-test analysis.
Data for a calculated variable must exist when the calculation occurs. If a calculation is based on one or more
other variables, data must exist for those variables. If the data does not exist, the calculation cannot be
performed.
A calculation can be based on a variable that is mapped to signal data. As a result, you can perform an
additional calculation on the data at the time the data is acquired for the cycle.
To view the list of variables that contain calculations, select:
•
Signal Dependent Variables—Shows the variables that have a calculation if part of the calculation is
based on a variable that is mapped to a signal data calculation. If another variable is referenced in the
calculation, the data for that variable must exist for the calculation to succeed.
•
Calculated Variables—Shows the variables that have a calculation. This option enlarges the variable
selection scope. As a result, you must be careful to make sure that all calculation references are resolved.
MTS TestSuite™ Fatigue Analyzer User Guide 91
7.0 Variable Analysis