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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>Overview</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">For some optimization problems, it can be desirable that a
sudden eigenfrequency is increased whereas the other eigenfrequencies
are allowed to decrease as shown in the figure below (a). </span>

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<p>In <a class = "xref" href = "tso-c-usr-sizing-TasksModAna-maxFirstFreq.htm#tso-c-usr-sizing-TasksModAna-maxFirstFreq" title = "The following shows how several lowest eigenfrequencies are increased.">Maximization of the First Eigenfrequencies</a> is described how  several lowest eigenfrequencies
are increased (figure below (b)) and <a class = "xref" href = "tso-c-usr-sizing-TasksModAna-maxTorsFreq.htm#tso-c-usr-sizing-TasksModAna-maxTorsFreq" title = "Often it is needed to increase a specific eigenfrequency in the eigenfrequency spectrum belonging to a certain eigenmode. In this case, a specific eigenfrequency is defined using TYPE = DYN_FREQ.">Maximizing the Torsional Modal Eigenfrequency</a> addresses how a specific eigenfrequency
in an eigenfrequency spectrum is optimized using mode tracking (figure
below (a)). </p>

<p>

When maximizing the stiffness under
the condition that the first eigenfrequency is above 100 Hz or when minimizing
the mass under the condition that the eigenfrequencies are below or
above certain specified values, an eigenfrequency
can be applied in a constraint.</p>
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