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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>About the Design Area</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3"><table class = "DocHeaderIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "shortdesc">During an optimization, only part of the model might be allowed to changed. This part is defined as the design area.
<ul><li><a href = "#tso-c-usr-sizing-designArea__" id = "toc_rg" title = "">Example</a></li></ul>
</p></td></tr></table></td><td class = "DocHeader2"><table class = "DocTopicsSeeAlso" id = "table13"><tr><td class = "TopicsTitle">See Also</td></tr><tr><td><a title = "Sometimes it is required to maintain material in certain parts of the design area, such that they remain unchanged in the optimized model. Element groups describing these parts can be defined as frozen area." href = "tso-t-usr-sizing-manuCond-frozAreaDef.htm">Defining Frozen Areas</a></td></tr></table></td></tr></table>




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<p>In sizing optimization, the design area denotes the set of elements whose thickness might be changed during the optimization, 
   in contrast to the frozen areas that remain unchanged.</p>
<p>The model for the sizing optimization consists of shell or beam elements in the design area where the optimization system can increase or decrease
   the elemental thicknesses to get better structural performance.</p>
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<p>The following start model for sizing optimization represents a design of a car frame. 
   The red areas of the component are not free for the optimization.</p>
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<td class = "entry"><br/><img class = "image" src = "../TsoUserImages/Sizing_DesArea.png" width = "300"/><br/>
                      <p>Yellow: Design Area</p>
                      <p>Gray: Frozen Area</p></td>
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