To specify a Primary Criterion object under the Solution object for a Modal analysis:
Select the Solution object and then select the Primary Criteria option from the Solution Context tab, or right-click the Solution object and select > > .
Specify the setting of the Base Result property. Property options for this analysis type include:
(default): Using this option, the application controls the i-th eigenfrequency that you have selected in the mode number. During the optimization the mode order may change, but the optimizer only focuses on the selected i-th eigenfrequency.
: Using this option, the application controls the i-th eigenfrequency that you have selected in the mode number, but also takes into account the presence of the other eigenfrequencies per a weighted sum. The purpose of this option is to better manage the mode-crossing effect, that is, modes order can change drastically during the solution and as a result, cause the solver to prematurely converge and produce an undesirable design.
When you select this option, the Frequency Reduction property displays. Property options include , , and .
Note: The rank of any eigenmode may change during the optimization. The option enables you to track a mode of interest, as long as it does not change drastically during the optimization process.
Specify a Mode Number that corresponds to the eigenfrequency you wish to observe. The default setting is
1. The entry range depends on the number of modes that you have requested in the upstream modal analysis, which has a default setting of6.When you solve, the read-only Value property displays the calculated frequency or frequencies. You can parameterize this value.
See the Understanding the Criterion Calculations section for a description of the calculations used to obtain the criterion.