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In the optimization task editor, click the
Perturbation tab.
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Enter the number of eigenmodes to track. The default value is five,
which means that the
Optimization module
tracks the five lowest eigenfrequencies.
In some cases many local low frequency eigenmodes appear during the
optimization iterations, which leads to a high number of modes to track and
degrades performance. You can avoid tracking a high number of modes by choosing
the lower bound of the eigenfrequencies to be 25% of the eigenfrequency of
interest in the first optimization iteration.
Mode tracking is not required if your design response will use the Kreisselmeier-Steinhauser
formulation to evaluate the eigenfrequencies. Your Abaqus model must include an output request for at least the number of
eigenfrequencies you are tracking.
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Select the region over which the
Optimization module
should track the eigenmodes.
By default, the
Optimization module
tracks the eigenmodes of all the nodes in the model, which can degrade
performance if you have a large model. You can improve the performance by
tracking the eigenmodes over only a selected region; for example, over selected
surfaces of your model or over points where lumped or rigid masses are
attached.
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