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
Kreisselmaier-Steinhauser formulation to evaluate the eigenfrequencies. Your
Abaqus
model must include an output request for at least the number of
eigenfrequencies you are tracking.