<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html
  SYSTEM "about:legacy-compat">
<html xmlns:mml = "http://www.w3.org/1998/Math/MathML" lang = "en"><head><meta charset = "UTF-8"/><meta name = "copyright" content = "(C) Copyright 2020"/><meta name = "DC.rights.owner" content = "(C) Copyright 2020"/><meta name = "DC.type" content = "concept"/><meta name = "abstract" content = "Couple displacements that are symmetric with respect to a point."/><meta name = "description" content = "Couple displacements that are symmetric with respect to a point."/><meta name = "DC.relation" scheme = "URI" content = "../TsoCmdMap/tso-r-cmd-linkShape.htm"/><meta name = "DC.format" content = "HTML5"/><meta name = "DC.identifier" content = "tso-c-usr-shape-desArea-lsPointSym"/><meta name = "DC.language" content = "en"/><link rel = "stylesheet" type = "text/css" href = "../DSDocUI_XML34.css"/><title>Point Symmetry (POINT_SYM)</title>
<script type = "text/javascript" src = "../DSDocUI_Highlight34.js">
  	/* */
  	</script></head><body onLoad = "highlightSearchTerms();" id = "tso-c-usr-shape-desArea-lsPointSym">
<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Point Symmetry (POINT_SYM)</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">
Couple displacements that are symmetric with respect to a point.
</span>

</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 link conditions (coupling conditions) for nodes in shape optimization." href = "../TsoCmdMap/tso-r-cmd-linkShape.htm">LINK_SHAPE</a></td></tr></table></td></tr></table>




<div class = "body conbody">

<p>
<table class = "table" id = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6"><caption/><colgroup><col style = "width:33.33333333333333%"/><col style = "width:33.33333333333333%"/><col style = "width:33.33333333333333%"/></colgroup><thead class = "thead">
<tr class = "row">
<th class = "entry" id = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__1">CLIENT / Applicable for</th>
<th class = "entry align-center" id = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__2">SHAPE_CONTROLLER</th>
<th class = "entry align-center" id = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__3">SHAPE_SENSITIVITY</th>
</tr>
</thead><tbody class = "tbody">
<tr class = "row">
<td class = "entry" headers = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__1">POINT_SYM</td>
<td class = "entry align-center" headers = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__2">OK</td>
<td class = "entry align-center" headers = "tso-c-usr-shape-desArea-lsPointSym__table_9AA84CBEBC894183AB8FB581E7F7E1E6__entry__3">-</td>
</tr>
</tbody></table>
</p>

<p> To be able to couple displacements symmetric to a point, the position of the point must be
            exactly specified. It is also necessary to specify tolerances to identify nodes that lie
            symmetric to one another relative to the point. The following three parameters are
            required for the definition of the link condition: </p>
<pre class = "codeblock">
<code class = "ph codeph">
CLIENT = POINT_SYM
CS     = name_of_coord_system
TOL    = &lt;tol_1&gt;, &lt;tol_2&gt;, &lt;tol_3&gt;
</code>
</pre>
<p>The origin of the coordinate system referenced by <code class = "ph codeph">CS</code>
defines the symmetry point. The symmetry of the nodes (assigned by <code class = "ph codeph">ND_GROUP</code>
in the <code class = "ph codeph">DVCON_SHAPE</code> command) is checked against the
symmetry point. Symmetric nodes are assembled into a symmetry group (normally
two symmetric nodes per symmetry group). Then the main node of the
symmetry group is determined and the displacements of the client nodes
are calculated in such a way that they move symmetric to the point of
the main node (see the following figure).</p>
<p>The tolerances are required to identify symmetric nodes. Point symmetric nodes share inversely
            equal coordinates (and added tolerances). The three tolerance values
                <code class = "ph codeph">tol_*</code> are assigned to the three coordinate directions of the
            coordinate system referenced by <code class = "ph codeph">CS</code>.</p>
<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent"><p><ul class = "ul" id = "tso-c-usr-shape-desArea-lsPointSym__ul_B9D692865FBF4553AFFF77CE9105E56A">
<li class = "li">
The coordinate system referenced by <code class = "ph codeph">CS</code> must be a Cartesian
coordinate system.</li>
<li class = "li"> Only the <code class = "ph codeph">MAIN=MAX</code> or
                            <code class = "ph codeph">MAIN=MIN</code> criteria are allowed for determination of the
                        main node.</li>
</ul></p></span></td></tr></table>

<table class = "table" id = "tso-c-usr-shape-desArea-lsPointSym__ae232806"><caption/><colgroup><col/></colgroup><tbody class = "tbody">
<tr class = "row">
<td class = "entry"><br/><img class = "image" id = "tso-c-usr-shape-desArea-lsPointSym__image_A01B5875DCC54039AE4BDB8F1DE44630" src = "../TsoUserImages/shape_point_coupling.png" width = "243" height = "166"/><br/></td>
</tr>
</tbody></table>

</div>

<div class = "related-links"/></td></tr></table><script type = "text/javascript" src = "../DSDocUI_Bottom34.js">/* */</script></body>
</html>
