Page 25 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis
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12 • using ansys for finite eLement anaLysis
The following window will appear:
As shown, select the Subspace method and enter 5 in the “No.
of modes to extract.” Check the box beside “Expand mode shapes”
and enter 5 in the “No. of modes to expand.” Click “OK.”
Note that the default mode extraction method chosen is the
Reduced Method. This is the fastest method as it reduces the system
matrices to only consider the Master Degrees of Freedom (MDOFs)
(see the following figure). The Subspace Method extracts modes
for all DOFs. It is therefore more exact but it also takes longer to
compute (especially when the geometry is complex).
The following window will then appear:
