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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>About the Threehole Example</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 = "shortdesc">
The lowest natural frequency is to be maximized in this example without a change in volume.
<p>This page discusses: </p><ul><li><a href = "#tso-c-example-shape-threehole__cs-model" id = "toc_rg" title = "">About the Model</a></li><li><a href = "#tso-c-example-shape-threehole__cs-ProcedureSummary" id = "toc_rg" title = "">Procedure Summary</a></li></ul>
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<div class = "section" id = "tso-c-example-shape-threehole__cs-model"><h2 class = "title sectiontitle">About the Model</h2>

<p>The following figure illustrates the initial model along with the first five eigenmodes.</p>
<p><br/><img class = "image" src = "../TsoExampleImages/shapeThreeholeModel.png"/><br/></p>
<p>The rim is modeled using 3D solid elements. Only
the surface nodes of the rim holes are used as design nodes. Two <span class = "ph">load cases</span> are
considered. The loads are applied on the node in the middle of the
mounting hole and transferred to the structure through RBE2 elements.</p>
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<div class = "section" id = "tso-c-example-shape-threehole__cs-ProcedureSummary"><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">Procedure Summary</h2>

<p><div class = "note"><span class = "run-in.note">Note:
			</span><span class = "notecontent">
This optimization task is a standard shape optimization task as described in
the Holeplate example. The set-up including starting a
SHAPE_CONTROLLER task, loading the model and definition of design
area, design variable constraint and objective function can be done as
described in the Getting Started Manual.
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<p>
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<tr class = "row">
<td class = "entry">Model:</td>
<td class = "entry">threehole.ext</td>
</tr>
<tr class = "row">
<td class = "entry">Design Area:</td>
<td class = "entry">Node group design_nodes</td>
</tr>
<tr class = "row">
<td class = "entry">Design Variable Constraint:</td>
<td class = "entry">Fixation of the displacement along the global x-axis for the node group <span class = "ph uicontrol">nodes_fix_x</span></td>
</tr>
<tr class = "row">
<td class = "entry">Mesh Smooth:</td>
<td class = "entry">Mesh smoothing of all elements, while free surface nodes remain free</td>
</tr>
<tr class = "row">
<td class = "entry">Objective:</td>
<td class = "entry">Maximize the first eigenfrequency</td>
</tr>
<tr class = "row">
<td class = "entry">Constraint:</td>
<td class = "entry">Relative volume of 100 % (equality constraint)</td>
</tr>
<tr class = "row">
<td class = "entry">Stop Condition</td>
<td class = "entry">The global stop condition is set to 5 iterations</td>
</tr>
</tbody></table>
</p>
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