Creo Topology Optimization > Model Setup > Constraints > To Define Displacement Constraints—Topology Optimization
  
To Define Displacement Constraints—Topology Optimization
1. Click Home > Constraints > Displacement. The Constraint dialog box opens.
2. Enter a descriptive name or accept the default name. Click the color swatch next to Name if you want to change the color of the constraint icon.
3. Select the desired constraint set from the Member of Set drop-down list. If you want to create a new constraint set, click New to show the Constraint Set Definition dialog box. Enter a name and optional description for a new constraint set.
4. If you did not select geometric entities as references before you opened the dialog box, you can now select one of the following References from the list:
Surfaces
Edges/Curves
Points
5. Select one or more references. Your selections appear in the References collector.
6. If you do not want to use the current coordinate system, click World to select the WCS, or click Selected to select a user-defined coordinate system in the Coordinate System area.
7. Click one of these settings buttons for each translational and rotational degree of freedom to define how you want to constrain the geometry:
 
Translation
Rotation
Free
Fixed
Prescribed
Function
If you select a prescribed setting, enter a value in the field to the right. You can enter a value, mathematical expression, or parameter name in this field. The value should be in length units for translation constraints, and in radians for rotation constraints.
8. Click OK to complete the definition and exit the dialog box.
For details about constraints, see the Creo Simulate help.