A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left"></td><td class="align_center">Modified TMM (Hz)</td><td class="align_center">FEM (Hz)</td><td class="align_center">Error (%)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">1st order bending frequency</td><td class="align_center">2837.1</td><td class="align_center">2840</td><td class="align_center">−0.102</td></tr><tr><td class="align_left">2nd order bending frequency</td><td class="align_center">7059.6</td><td class="align_center">7071.1</td><td class="align_center">−0.163</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The results of the rotor modal by the modified TMM and FEM.</div>

Shock and Vibration

tab3

Table 3

Table 3: A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump 