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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>Filter Restriction (CHECK_TYPE=FILTER)</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">
	You can define a filter restriction with additional settings for the restriction group. With it, a more consistent workflow between bead and
	other optimization types is achieved. In addition, it tends to lead to a better optimization convergence behavior.</span>

</p>
<p>This page discusses: </p><ul><li><a href = "#tso-c-usr-bead-restrictions-Filter__tso-c-user-bead-restrictions-Filter-def" id = "toc_rg" title = "">Filter Restriction Definition</a></li><li><a href = "#tso-c-usr-bead-restrictions-Filter__tso-c-user-bead-restrictions-Filter-example" 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></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 bead optimization." href = "../TsoCmdMap/tso-r-cmd-dvconBead.htm#tso-r-cmd-dvconBead">DVCON_BEAD</a></td></tr></table></td></tr></table>




<div class = "body conbody">
<div class = "section" id = "tso-c-usr-bead-restrictions-Filter__tso-c-user-bead-restrictions-Filter-def"><h2 class = "title sectiontitle">Filter Restriction Definition</h2>

<p>A filter restriction is activated by setting the check type (<code class = "ph codeph">CHECK_TYPE</code>) of the design variable constraint to <code class = "ph codeph">FILTER</code>.
The restriction is defined by the following parameters:
<ul class = "ul">
<li class = "li"><code class = "ph codeph">ND_GROUP</code>: The group of node for which the constraint is active.
     Defining a node group is mandatory.</li>
<li class = "li"><code class = "ph codeph">CHECK_GROUP</code>: The group of node that will be used in the internal check
    if nodes are properly supported and taken into account.
    ND_GROUP will be used if this parameter is not used.</li>

<li class = "li"><code class = "ph codeph">RADIUS</code>: Defines the filter radius in terms of value and whether absolute or relative units are used.
    If omitted, double the average edge length of the model is used.</li>
</ul>
</p>
<p>The parameter file command might look like the following:</p>
<pre class = "codeblock">
<code class = "ph codeph">
DVCON_BEAD
  ID_NAME     = MY_DVCON_BEAD
  ND_GROUP    = ALL_NODES
  CHECK_TYPE  = FILTER
  CHECK_GROUP = ALL_NODES
  RADIUS      = 3.0, REL
END_
</code>
</pre>
<p>
<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent">
<ul class = "ul">
<li class = "li">The filter restriction can only be used in combination with the sensitivity-based bead optimization approach.</li>
<li class = "li">When a filter restriction is used during the optimization, the default filtering (usually set in <code class = "ph codeph">OPT_PARAM</code>) is deactivated.</li>
</ul>
</span></td></tr></table>

</p>
</div>


<div class = "section" id = "tso-c-usr-bead-restrictions-Filter__tso-c-user-bead-restrictions-Filter-example"><p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title sectiontitle">Example</h2>


<p>The parameter file command that is used in this example looks like the following:</p>
<pre class = "codeblock">
<code class = "ph codeph">
DVCON_BEAD
  ID_NAME     = MY_DVCON_BEAD
  ND_GROUP    = ALL_NODES
  CHECK_TYPE  = FILTER
  CHECK_GROUP = ALL_NODES
  RADIUS      = 3.0, REL
END_
</code>
</pre>
<p>Without the filter restriction (filtering the sensitivities), the result looks as follows:</p>
<br/><img class = "image" src = "../TsoUserImages/bead_dvcon_filter_sens.png" width = "400"/><br/>
<p>With the filter restriction (filtering the design variables), the following result is obtained while reducing the objective by 20%:</p>
<br/><img class = "image" src = "../TsoUserImages/bead_dvcon_filter_dv.png" width = "400"/><br/>
</div>

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