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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>Maximize Stiffness with Controller-Based Algorithm</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
<span class = "shortdesc">How to set up a bead optimization that maximizes the stiffness
of a structure using the bead controller algorithm is described.</span>

</p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-usr-beadOptTasksLS-beadMaxStiffness-controller" id = "toc_rg" title = "">Use the BEAD_CONTROLLER Algorithm</a></li><li><a href = "#tso-t-usr-beadMaxStiffness-definitionObjFunc" id = "toc_rg" title = ""> Define the Objective Function</a></li></ul>
</p></td></tr></table></td></tr></table>
  

  
  
<article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-usr-beadOptTasksLS-beadMaxStiffness-controller">
<h2 class = "title topictitle2">Use the BEAD_CONTROLLER Algorithm</h2>

<div class = "body taskbody">
<section><ol class = "ol steps"><li class = "li step stepexpand">
To maximize the stiffness of the structure, minimize the compliance - or sum of
strain energy. 
</li><li class = "li step stepexpand">
Define the design response like the following:
<p>
<pre class = "codeblock">
<code class = "ph codeph">
DRESP
 ID_NAME    = dresp_compliance
 TYPE       = STRAIN_ENERGY
 DEF_TYPE   = SYSTEM
 UPDATE     = EVER
 EL_GROUP   = ALL_ELEMENTS
 GROUP_OPER = SUM
 LC_SET     = Static,1,All
END_
</code>
</pre>
<div class = "note"><span class = "run-in.note">Note:
			</span><span class = "notecontent">
<p><ul class = "ul">
<li class = "li">Compliance is defined as the sum of the energy of all the elements in
the FE-model regardless how large your design domain might be.</li>
<li class = "li">The algorithm is based on element stress tensors. Therefore, these
must be requested in the FE-analysis, but <span class = "ph">Tosca Structure</span>
for most solvers adds these result request.</li>
</ul>
</p></span></div>

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

</article>

<article class = "topic task nested1" aria-labelledby = "ariaid-title3" id = "tso-t-usr-beadMaxStiffness-definitionObjFunc">
<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 the Objective Function</h2>

<div class = "body taskbody">
<section><div class = "li step p">
Define the objective function like the following:
<p>
<pre class = "codeblock">
<code class = "ph codeph">
OBJ_FUNC
 ID_NAME = minimize_compliance
 DRESP   = dresp_compliance
 TARGET  = MIN
END_
</code>
</pre>
</p>
</div></section>
</div>

</article>
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