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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>Defining Frozen Areas</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 = "header"><p class = "abstract">
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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.
</span>

<p>This option is used to exclude the so-called frozen elements from
being modified during the optimization, even though these elements
are included in the design space. This is the case, for example, when the elements
are used in order to fix the component and therefore should be preserved
independently of their internal loads. The inclusion into the design
space might be necessary, for example, to control the target volume (see constraints
“absolute volume” or “relative volume”, Bd.1, Chapter 5.5.1).</p>
</p>

</p></td></tr></table></td><td class = "DocHeader2"><table class = "DocTopicsSeeAlso" id = "table13"><tr><td class = "TopicsTitle">See Also</td></tr></table><table class = "DocTopicsInOtherGuides" id = "table14"><tr><td height = "8px"/></tr><tr><td class = "TopicsTitleNormal">In Other Guides</td></tr><tr><td><a title = "Defines restrictions of the design variables in sizing optimization." href = "../TsoCmdMap/tso-r-cmd-dvconSizing.htm#tso-r-cmd-dvconSizing">DVCON_SIZING</a></td></tr></table></td></tr></table>




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<section><ol class = "ol steps"><li class = "li step">
Choose <span class = "ph uicontrol">Command | DVCON_SIZING</span> in 
<span class = "ph">Tosca Structure.pre</span>
screen.
</li><li class = "li step">
Apply an <span class = "ph uicontrol">ID_NAME</span> and select the
element group that is to be frozen. If the element group is not already defined, it is necessary
to define it in advance using the <code class = "ph codeph">GROUP_DEF</code> command.
</li><li class = "li step">
Choose <span class = "ph uicontrol">Type = Frozen</span>.
<br/><img class = "image" src = "../TsoUserImages/size_dvcon_sizing_frozen.png" width = "450"/><br/>
</li></ol></section>
</div>

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