Creo Simulate > Modeling Structure and Thermal Problems > Measures > Measures Definition Dialog Box > Define Measures in Structure > Measure Quantities > Rotational Acceleration
  
Rotational Acceleration
Use a rotational acceleration measure to measure rotational acceleration in terms of magnitude or component direction.
Specify information for the following items that appear on the Measure Definition dialog box after you select Rotational Acceleration as the quantity:
Component—Select one of the following:
Magnitude
X
Y
Z
For the options X, Y, or Z, select a coordinate system relative to which you define the measure. The default coordinate system is the WCS. You can use the arrow button to select a UCS.
Spatial Evaluation—Select a spatial evaluation method for your quantity from this option menu.
Dynamic Evaluation—Select a time or frequency evaluation method.
Return to Quantity for Measure Definition.