From the main menu bar, select .
The Create Constraint dialog box appears.
From the Create Constraint dialog box that appears, enter the name of the constraint. The Edit Constraint dialog box appears.
From the menu, select the design response that will be used to define this constraint. Alternatively, you can select to create a new design response and add it to the list of design responses. The constraint editor displays the type of the design response, which is the variable you are constraining. If you are performing a conditionbased optimization, you must select a volume constraint.
Define the constraint. The editor provides different options, depending on the type of optimization task you selected.

If you are defining a constraint for a conditionbased topology or shape optimization, the volume constraint can be either of the following:

If you are defining a constraint for a general topology optimization, the constraint can be one of the following:

Less than, greater than, or equal to a fixed value.

Less than, greater than, or equal to a fraction of the value before the optimization starts.
Note:
During a conditionbased topology or shape optimization, the volume is reduced incrementally until the volume constraint is satisfied during the last step. In contrast, a general topology optimization satisfies the volume constraint in the first design cycle. As a consequence, a general topology optimization starts with a much weaker structure, and the element density is scaled to satisfy the remaining constraints and objectives.
Click OK to save your data and to exit the editor.
