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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 a Range of Modes</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 how to set up <span class = "ph">Tosca</span> to maximize multiple modes.</span>

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<p>Maximizing a range of modes can be done as follows:</p>
<pre class = "codeblock">
<code class = "ph codeph">
DRESP
 ID_NAME  = dresp_eigs_1-5
 DEF_TYPE = SYSTEM
 TYPE     = DYN_FREQ
 LC_SET   = Modal,All,1-5
END_

OBJ_FUNC
 ID_NAME = max_dresp_eigs_1-5
 DRESP   = dresp_eigs _1-5
 TARGET  = MAX
END_
</code>
</pre>
<p>Here, the 5 first modes are summed in one design response (<code class = "ph codeph">dresp_eigs_1-5</code>).
This sum is being maximized (<code class = "ph codeph">TARGET=MAX</code>).</p>
<p>This solution often has the pitfall that the higher modes usually
are weighted higher than the lower ones. One way to circumvent this is
to define a design response for each eigenmode:</p>
<pre class = "codeblock">
<code class = "ph codeph">
DRESP
 ID_NAME  = dresp_eig1
 DEF_TYPE = SYSTEM
 TYPE     = DYN_FREQ
 LC_SET   = Modal,All,1
END_

DRESP
 ID_NAME  = dresp_eig2
 DEF_TYPE = SYSTEM
 TYPE     = DYN_FREQ
 LC_SET   = Modal,All,2
END_

DRESP
 ID_NAME = dresp_eig...
 ...

OBJ_FUNC
 ID_NAME =  max_dresp_eigs_1-5
 DRESP   = dresp_eig1,  0.10 , ! 100. Hz
 DRESP   = dresp_eig2,  0.05, ! 200. Hz
 DRESP   = dresp_eig3,  0.04 , ! 250. Hz
 DRESP   = dresp_eig4,  0.0025 ! 400. Hz
 DRESP   = dresp_eig5,  0.002 ,! 500. Hz
 TARGET  = MAX
END_
</code>
</pre>
<p>Here, each of the five first modes is multiplied by a weight (reciprocal value of the initial
   eigenvalue) and then summed and maximized.</p>
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