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

<table class="table-group" id="tab2"><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">Traditional 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">243.97</td><td class="align_center">226.01</td><td class="align_center">7.95</td></tr><tr><td class="align_left">2nd order bending frequency</td><td class="align_center">411.64</td><td class="align_center">387.88</td><td class="align_center">6.13</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The natural frequencies of the stepped shaft.</div>

Shock and Vibration

tab2

Table 2

Table 2: A Modified Transfer Matrix Method for Modal Analysis of Stepped Rotor Assembly Applied in the Turbomolecular Pump 