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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> Adjust Eigenvalue</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">This section describes the setup used to maximize a certain eigenvalue up to a specific
value.</span>

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<p>The opposite of the former approach might also be the case—that is to force an eigenfrequency to
   achieve a certain value. This might be realized using constraint functions.</p>
<pre class = "codeblock">
<code class = "ph codeph">
DRESP
 ID_NAME  = dresp_eig_2
 DEF_TYPE = SYSTEM
 TYPE     = DYN_FREQ
 LC_SET   = Modal,All,2
END_

OBJ_FUNC
 ID_NAME = max_dresp_eig_2
 DRESP = dresp_eig_2
 TARGET = MAX
END_

CONSTRAINT
 ID_NAME   = con_dresp_eig_2_le_15Hz
 DRESP     = dresp_eig_2
 MAGNITUDE = ABS
 LE_VALUE  = 15.
END_

OPTIMIZE
 ID_NAME    = opt
 DV         = my_design_nodes
 STRATEGY   = BEAD_SENSITIVITY
 OBJ_FUNC   = max_ dresp_eig2
 CONSTRAINT = con_dresp_eig_2_le_15Hz
END_
</code>
</pre>
<p>The second eigenmode will be maximized, but because of the constraint
it might not become higher than 15. Hz.</p>
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