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Converting Time (s) into Crank Angle (deg) for Plots

When using a model with "Analysis_Time" == Time (seconds), it is still possible to adjust the X-Axis of the graph to be vs. Crank Angle. This situation most commonly occurs when you Query a variable vs. Time. The resulting plotter (graph) is queried against Analysis_Time, which is most commonly represented as time in seconds. However, it quite advantageous to have the x-axis represented in Crank Angle, rather than time (seconds). This is actually quite easy to adjust in EnSight.

Method:

  1. Query the variable vs. Time as normal.
  2. Edit the Query, and select the "Query Display" tab towards the bottom of the Query/Plotter Feature Editor.
  3. Adjust the X-scale to be 6 * RPM.
  4. Adjust the X-offset to be the initial Crank Angle.

The values along the X-axis have now been adjusted by : (Time * 6 * RPM) + Initial_Crank_Angle. The result is that the X-axis units will be in Crank Angle Degrees.

 

As an optional step, you may want to also adjust the label for the X-axis in the plotter as well. This is also quite straight forward to do:

  1. Edit the Plotter's Attributes (Right click on Plotter -- > Edit)
  2. In the "Axis specific" tab, adjust the attributes of the X axis
  3. In the "Title" section, replace the "Time (s)" with "Crank Angle <sy>176"

The "<sy>176" denotes to EnSight to use Symbol #176, which corresponds to a degree sign.


The resulting plotter will now have the units of Crank Angle on the X-axis, as well as the label denoting the correct unit:

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