Acceleration
Use an acceleration measure to measure 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 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.
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The units of acceleration displayed for an acceleration measure are length/time 2. However these units are correct only for dynamic time and dynamic frequency analyses. For a dynamic random analysis the units of acceleration PSD are [length 2/ time 4 ]/Hz.