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 <title>iMechanica - Rotating Beams/Frequencies/Errors/Abaqus input file attached - Comments</title>
 <link>http://imechanica.org/node/3212</link>
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 <title>Rotating Beams/Frequencies/Errors/Abaqus input file attached</title>
 <link>http://imechanica.org/node/3212</link>
 <description>&lt;p&gt;
Im trying to model a rotating uniform beam for 12 rotational speeds in Abaqus using c3d20 elements. As expected, &amp;quot;step 1 to step 5&amp;quot; the frequencies increase as the rotational speed is increased. However, for some strange reason, the frequencies stop varying from the fifth speed. I do get warning messages when running the input file but i cant intepret them well since Im new to Abaqus.
&lt;/p&gt;
&lt;p&gt;
I believe the problem is elementary but i cant figure it out. Can anyone review or run the attached input file to let me know what I&amp;nbsp; am not doing or what exactly is wrong.
&lt;/p&gt;
&lt;p&gt;
Many thanks.
&lt;/p&gt;
&lt;p&gt;
D Jackson
&lt;/p&gt;
&lt;br class=&quot;clear&quot; /&gt;</description>
 <comments>http://imechanica.org/node/3212#comments</comments>
 <category domain="http://imechanica.org/taxonomy/term/128">education</category>
 <enclosure url="http://imechanica.org/files/IMECHANICAc3d20r0203.doc" length="66048" type="application/msword" />
 <pubDate>Tue, 20 May 2008 20:59:41 -0400</pubDate>
 <dc:creator>D.Jackson</dc:creator>
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