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<p class="MsoNormal"><span lang="EN-US">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m performing a (mechanical) calculation using the eigs and I’ve been noticing that the results are strongly sensitive on the unit system I’m using; I can understand that high numbers can lead to some numerical “issues”
…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Is there a way to increase the accuracy ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Paul<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">PS: the 2 types of results<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><u><span lang="EN-US">NB</span></u></i><span lang="EN-US">:<o:p></o:p></span></p>
<p class="MsoNormal">1 (MPa) = 1E6 (Pa)<o:p></o:p></p>
<p class="MsoNormal">1 (mm) = 1E-3 (m)<o:p></o:p></p>
<p class="MsoNormal">1 (Kg/m^3) = 1E12 (T/mm^3)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Monospaced","serif";color:#4A55DB;mso-fareast-language:FR">[</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Monospaced","serif";color:black;mso-fareast-language:FR">u,v</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Monospaced","serif";color:#4A55DB;mso-fareast-language:FR">]</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Monospaced","serif";mso-fareast-language:FR">
<span style="color:#5C5C5C">=</span> <u><span style="color:#AE5CB0">eigs</span></u><span style="color:#4A55DB">(</span><span style="color:black">K</span><span style="color:#4A55DB">((</span><span style="color:black">ddl_elem</span><span style="color:#5C5C5C">+</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#FFAA00">:$</span><span style="color:black">,</span><span style="color:#4A55DB">(</span><span style="color:black">ddl_elem</span><span style="color:#5C5C5C">+</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#FFAA00">:$</span><span style="color:#4A55DB">)</span><span style="color:black">,M</span><span style="color:#4A55DB">((</span><span style="color:black">ddl_elem</span><span style="color:#5C5C5C">+</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#FFAA00">:$</span><span style="color:black">,</span><span style="color:#4A55DB">(</span><span style="color:black">ddl_elem</span><span style="color:#5C5C5C">+</span><span style="color:rosybrown">1</span><span style="color:#4A55DB">)</span><span style="color:#FFAA00">:$</span><span style="color:#4A55DB">)</span><span style="color:black">,n,</span><span style="color:rosybrown">"SM"</span><span style="color:#4A55DB">)</span><span style="color:black">;</span><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">a) calculation 1 in Pa, m, Kg/m^3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Natural frequency calculation:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 1 : 497.956 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 2 : 3120.64 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 3 : 5277.8 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 4 : 6948.69 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 5 : 8737.88 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 6 : 15832.1 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 7 : 17122.8 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 8 : 20847.8 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 9 : 26382.5 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 10 : 28305.1 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 11 : 34752 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 12 : 36926.4 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">b) Calculation in MPa, mm, T/mm^3 ….<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Natural frequency calculation:<o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-US">- Resonance 1 : 497.955 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 2 : 497.956 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 3 : 3120.59 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 4 : 3120.64 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 5 : 6948.69 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 6 : 7463.93 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 7 : 8737.56 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 8 : 8737.88 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 9 : 17121.6 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 10 : 17122.8 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 11 : 20847.8 Hz<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> - Resonance 12 : 22390 Hz
</span><o:p></o:p></p>
<p><b><i><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">EXPORT CONTROL :
<br>
</span></i></b><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Cet email ne contient pas de données techniques<br>
This email does not contain technical data</span></b><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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