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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>Tips on Defining Restrictions</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 = "abstract">
<ul class = "ul">
<li class = "li">The element group for a certain restriction should be a subset of the
design element group. If this is not the case, <span class = "ph">SIMULIA Tosca Structure</span>
will stop the optimization.</li>
<li class = "li">The 
<code class = "ph codeph">DVCON_SIZING</code>

<code class = "ph codeph">ID_NAME</code> must be referenced in the 
<code class = "ph codeph">OPTIMIZE</code>

command in order to activate the restriction. In <span class = "ph">Tosca Structure.gui</span>,
the <code class = "ph codeph">DVCON_SIZING</code> entry must be activated in the <code class = "ph codeph">OPTIMIZE</code>
mask.</li>
<li class = "li">
<pre class = "codeblock">
<code class = "ph codeph">
OPTIMIZE
  ...
  DVCON =<span class = "ph"> name_of_dvcon_entry</span> 
  ...
END_
</code></pre>
</li>
<li class = "li">Each geometrical restriction reduces the possibilities of the solution.
Thus, it is necessary to add only the restrictions needed for solving
the problem. It is still possible to find a solution if too many restrictions
are defined, but the result will most probably be suboptimal compared
to the optimal design. Therefore, the first step for the user is to perform
an optimization without restrictions to obtain knowledge about the restrictions
needed for the specific problem.</li>
<li class = "li">It is impossible to combine all manufacturing constraints at random.
The user must be careful when combining conflicting restrictions. </li>
</ul>

</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">DVCON_SIZING</a></td></tr></table></td></tr></table>





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