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h2. Input & Output Parameters


h4. Input Parameters: Hole Radius

The radius of the hole needs to be declared a design variable.  In order to do so first, open the {color:#990099}{*}{_}Design Modeler{_}{*}{color} from the Project Schematic window. Then expand {color:#990099}{*}{_}XYPlane{_}{*}{color}.  Next, highlight {color:#990099}{*}{_}Sketch1{_}{*}{color}. Now, check the box to the left of "R3", which will be in the "Dimensions: 3" part of the "Details View" table.  When you check the box an uppercase "D" will appear within the box and you will be asked what to call the parameter.  Call the parameter "DS_R".  The {color:#990099}{*}{_}Design Modeler{_}{*}{color} can now be closed.

h4. Objective Function: Minimize Volume  

This particular optimization problem has two output parameters: the volume of the quarter plate and the maximum Von Mises stress. In order to specify the volume output parameters, first {color:#990099}{*}_(Open) Mechanical > (Expand) Geometry > (Highlight) Surface Body{_}{*}{color}. In the "Details of "Surface Body"" table expand {color:#990099}{*}{_}Properties{_}{*}{color} then check the box to the left of {color:#990099}{*}{_}Volume{_}{*}{color}.  A "P" should now be located within the box. 

h4. Constraints: Maximum Von Mises Stress {latex}$\le ${latex}

Now, the maximum Von Mises Stress will be specified as an output parameter. In order to do so, {color:#990099}{*}_(Expand) Solution > (Highlight) Equivalent Stress{_}{*}{color}. In the "Details of "Equivalent Stress"" window, underneath {color:#990099}{*}{_}Results{_}{*}{color}, check the box to the left of {color:#990099}{*}{_}Maximum{_}{*}{color}. Once again a "P" should appear to the left of the box to illustrate to the user that the maximum Von Mises stress has been designated as an output parameter.
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At this point the {color:#990099}{*}{_}Mechanical{_}{*}{color} window can be closed and you may want to save the project.
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