<?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 = "A parameter-free optimization is performed for shape optimization in SIMULIA Tosca Structure, that is, each of the design nodes can be moved independent of the other design nodes. However, in some cases certain restrictions are specified that make it necessary to link or couple design nodes. The design nodes are then no longer allowed to move freely; there is an interdependent relationship between the individual design nodes. This relationship is defined by a link condition."/><meta name = "description" content = "A parameter-free optimization is performed for shape optimization in SIMULIA Tosca Structure, that is, each of the design nodes can be moved independent of the other design nodes. However, in some cases certain restrictions are specified that make it necessary to link or couple design nodes. The design nodes are then no longer allowed to move freely; there is an interdependent relationship between the individual design nodes. This relationship is defined by a link condition."/><meta name = "DC.relation" scheme = "URI" content = "tso-m-usr-shape-desAreaLinkShape-sb.htm"/><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-dvcCheckLink"/><meta name = "DC.language" content = "en"/><link rel = "stylesheet" type = "text/css" href = "../DSDocUI_XML34.css"/><title>Assigning Link/Coupling Conditions (CHECK_LINK)</title>
<script type = "text/javascript" src = "../DSDocUI_Highlight34.js">
  	/* */
  	</script></head><body onLoad = "highlightSearchTerms();" id = "tso-c-usr-shape-desArea-dvcCheckLink">
<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>Assigning Link/Coupling Conditions (CHECK_LINK)</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">
A parameter-free optimization is performed for shape optimization
in <span class = "ph">SIMULIA Tosca Structure</span>,
that is, each of the design nodes can be moved independent of the other
design nodes. However, in some cases certain restrictions are specified
that make it necessary to link or couple design nodes. The design nodes are then no longer allowed
to move freely; there is an interdependent relationship between the individual
design nodes. This relationship is defined by a link condition.
</span>

</p>

</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 = "Shape optimization involves determining displacement for every design node. The displacement of the neighboring nodes is not coupled, that is, each of the design nodes can move independent from the other design nodes. For example during optimization, free-form surfaces might develop from flat surfaces. By coupling the design nodes the optimization can maintain the regularity of planes." href = "tso-m-usr-shape-desAreaLinkShape-sb.htm">Link and Coupling Conditions (LINK_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 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"><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-dvcCheckLink__entry__1">Applicable for</th>
<th class = "entry align-center" id = "tso-c-usr-shape-desArea-dvcCheckLink__entry__2">Controller (SHAPE_CONTROLLER)</th>
<th class = "entry align-center" id = "tso-c-usr-shape-desArea-dvcCheckLink__entry__3">Sensitivity (SHAPE_SENSITIVITY)</th>
</tr>
</thead><tbody class = "tbody">
<tr class = "row">
<td class = "entry" headers = "tso-c-usr-shape-desArea-dvcCheckLink__entry__1">CHECK_LINK</td>
<td class = "entry align-center" headers = "tso-c-usr-shape-desArea-dvcCheckLink__entry__2">OK</td>
<td class = "entry align-center" headers = "tso-c-usr-shape-desArea-dvcCheckLink__entry__3">(OK) - Not all link conditions are available.</td>
</tr>            
</tbody></table>
</p>
 
<p>The following are examples of the type of restrictions that might necessitate the activation of
            link conditions: All design nodes in the start model are located on a cylinder and
            should also be located on a cylinder (with an altered radius) in the optimized model.
            Another example: Due to a specified punch direction, the design nodes must lie along the
            punch direction. Yet another example: an originally symmetrical component should still
            be symmetrical following the optimization despite asymmetric stress. The parameter</p>
<pre class = "codeblock">
<code class = "ph codeph">CHECK_LINK = link_shape_name</code>
</pre>
<p>activates a link condition for the nodes of the node group (<code class = "ph codeph">ND_GROUP</code>
parameter). This link condition must be defined with the <code class = "ph codeph">LINK_SHAPE</code>
parameter and referenced with its unique name (<code class = "ph codeph">link_shape_name</code>).
The possibilities for defining link conditions are numerous and varied.
Since it is not necessary to know the link conditions for the basic definition
of a shape optimization job, inexperienced readers should skip this chapter
at this time. This section can be read when the need arises.</p>
    
<div class = "note"><span class = "run-in.note">Note:
			</span><span class = "notecontent"><p><ul class = "ul">
<li class = "li">An individual link condition can be assigned several times, that is, an
individual link condition can be activated in several <code class = "ph codeph">DVCON_SHAPE</code>
entries for several node groups.</li>
<li class = "li">Some manufacturing restrictions require the definition of numerous
node groups and restrictions. To make this easier, you can automatically
generate node groups using the <code class = "ph codeph">GROUP_AUTO_DEF</code> command
and automatically assign link conditions as restrictions using the <code class = "ph codeph">DVCON_AUTO_SHAPE</code>
command.</li>
<li class = "li">Coupling conditions can be defined using the modules buttons <code class = "ph codeph">LINK_SHAPE</code>
and <code class = "ph codeph">DVCON_SHAPE</code>.
</li>
</ul></p></span></div>

   
</div>


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