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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>Settings for Sensitivity-Based Shape Optimization</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">
<span class = "shortdesc"> The optimization procedure of the sensitivity-based optimization approach in <span class = "ph">SIMULIA Tosca Structure</span> can be influenced by various settings. </span>

</p>
<ul><li><a href = "#tso-c-usr-shape-settingsSens__tso-c-usr-shape-settingSens-Filter" id = "toc_rg" title = "">Filter</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 = "Tosca Structure.shape contains various settings that might be applied to both, the controller-based and the sensitivity-based shape optimization approach. These settings are introduced in this chapter." href = "tso-c-usr-shape-settingsGen.htm#tso-c-usr-shape-settingsGen">Settings for Tosca Structure.shape</a></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 href = "../TsoCmdMap/tso-r-cmd-optParam.htm#tso-r-cmd-optParam__tso-r-cmd-optParam-shapeSens">Parameters for Sensitivity-Based Shape Optimization</a></td></tr><tr><td><a title = "Defines parameters to control optimization." href = "../TsoCmdMap/tso-r-cmd-optParam.htm#tso-r-cmd-optParam">OPT_PARAM</a></td></tr></table></td></tr></table>




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<div class = "section" id = "tso-c-usr-shape-settingsSens__tso-c-usr-shape-settingSens-Filter"><h2 class = "title sectiontitle">Filter</h2>

<p><span class = "ph">SIMULIA Tosca Structure</span> uses a filter on the objective function sensitivities, the constraint sensitivities and the
    design variables to gain smooth results. The filter settings can be altered to either use
    another filter radius or to disable the filter.
    <pre class = "codeblock">
<code class = "ph codeph">
FILTER_RADIUS= &lt;positive_real_value&gt;</code>, [<code class = "ph codeph">ABS</code>|REL]
</pre>
    The filter radius is used to filter the objective function sensitivities, the constraint
    sensitivities, and the design variables. The second parameter indicates if the radius is given
    in <code class = "ph codeph">ABS</code>olute units (default) or <code class = "ph codeph">REL</code>ative (in terms of the
    medium edge length). Default value is 4 * medium_edge_length. To disable filtering, use
     <code class = "ph codeph">0</code> or any negative value. Using the
     <code class = "ph codeph">FILTER_RADIUS=&lt;value&gt;</code> parameter is equivalent to using the three
    parameters
    <pre class = "codeblock">
<code class = "ph codeph">
OPT_PARAM
 ID_NAME       = MY_OPT_PARAM
 OPTIMIZE      = MY_OPTIMIZE
 FILTER_SEN    = &lt;value&gt;
 FILTER_CONSEN = 0.5*&lt;value&gt;
 FILTER_DV     = 0.5*&lt;value&gt;
END_
</code>
</pre>
   </p>

<p>It is also possible to set individual filter radii. For the objective function sensitivity filtering use
<pre class = "codeblock">
<code class = "ph codeph">
FILTER_SEN= &lt;positive_real_value&gt;</code>, [<code class = "ph codeph">ABS</code>|REL]
</pre>
For filtering the sensitivities of the constraints, use
<pre class = "codeblock">
<code class = "ph codeph">
FILTER_CONSEN= &lt;positive_real_value&gt;</code>, [<code class = "ph codeph">ABS</code>|REL]
</pre>
and for filtering the design variables use
<pre class = "codeblock">
<code class = "ph codeph">
FILTER_DV= &lt;positive_real_value&gt;</code>, [<code class = "ph codeph">ABS</code>|REL]
</pre>
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