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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> Defining Design Variables</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 = "shortdesc">
Design variables for shape optimization are defined when assigning
a node group to the design area.
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-usr-shape-desArea-desVar-gui" id = "toc_rg" title = "">
Define a Design Variable in <span class = "ph">Tosca Structure.gui</span>
</a></li><li><a href = "#tso-t-usr-shape-desArea-desVar-cmd" id = "toc_rg" title = "">
Define a Design Variable in the <span class = "ph">SIMULIA Tosca Structure</span> Parameter File
</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 = "Definition of the design nodes for shape optimization." href = "../TsoCmdMap/tso-r-cmd-dvShape.htm#tso-r-cmd-dvShape">DV_SHAPE</a></td></tr></table></td></tr></table>




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<article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-usr-shape-desArea-desVar-gui">
<h2 class = "title topictitle2">
Define a Design Variable in <span class = "ph">Tosca Structure.gui</span>
</h2>

<div class = "body taskbody">
<section><ol class = "ol steps"><li class = "li step">

Choose <span class = "ph uicontrol">Command | DV_SHAPE</span> in <span class = "ph">Tosca Structure.pre</span>.

</li><li class = "li step">

In the DV_SHAPE dialog, select a node group and assign an ID_NAME for further reference to
the definition.<br/><img class = "image" id = "tso-t-usr-shape-desArea-desVar-gui__image_17D6D78F0D5C45249EA1A293671E4368" src = "../TsoUserImages/shape_DV_SHAPE_gui.png" width = "450"/><br/>

</li></ol></section>
</div>

</article>
<article class = "topic task nested1" aria-labelledby = "ariaid-title3" id = "tso-t-usr-shape-desArea-desVar-cmd">
<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 topictitle2">
Define a Design Variable in the <span class = "ph">SIMULIA Tosca Structure</span> Parameter File
</h2>

<div class = "body taskbody">
<section><div class = "li step p">

To define Design variables in the parameter file use the <code class = "ph codeph">DV_SHAPE</code>
command.

<div class = "itemgroup stepresult">
Each <code class = "ph codeph">DV_SHAPE</code> definition has a name (<code class = "ph codeph">ID_NAME</code>
parameter) and references a previously defined node group (<code class = "ph codeph">ND_GROUP</code>
parameter). The name is required in order to subsequently activate the
<code class = "ph codeph">DV_SHAPE</code> definition when specifying the optimization
job (see <code class = "ph codeph">OPTIMIZE</code> command). The design area is specified
by the node group. These two declarations are mandatory. Other declarations
cannot be made. <p>
A typical <code class = "ph codeph">DV_SHAPE</code> command appears as follows:
</p><pre class = "codeblock">
<code class = "ph codeph">
DV_SHAPE
 ID_NAME        = design_variables
 ND_GROUP       = design_nodes
END_

DRESP
 ID_NAME        = DRESP_SIG
 DEF_TYPE       = SYSTEM
 TYPE           = SIG_MISES
 UPDATE         = EVER
 EL_GROUP       = ALL_ELEMENTS
 GROUP_OPER     = SUM
END_

DRESP
 ID_NAME        = DRESP_VOL
 DEF_TYPE       = SYSTEM
 TYPE           = VOLUME
 UPDATE         = EVER
 EL_GROUP       = ALL_ELEMENTS
 GROUP_OPER     = SUM
END_

OBJ_FUNC
 ID_NAME        = minimize_stress
 DRESP          = DRESP_SIG
 TARGET         = MIN
END_

CONSTRAINT
 ID_NAME        = volume_constraint
 DRESP          = DRESP_VOL
 MAGNITUDE      = REL
 EQ_VALUE       = 0.45
END_

OPTIMIZE
 ID_NAME        = topology_optimization
 DV             = design_variables
 OBJ_FUNC       = minimize_stress
 CONSTRAINT     = volume_constraint
 STRATEGY       = SHAPE_CONTROLLER
END_
</code>
</pre>
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