Vibration Analysis of Aeroengine Blisk Structure Based on a Prestressed CMS Super-Element Method

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Mode order</td><td class="align_center">Fixed width</td><td class="align_center">Fixed length</td><td class="align_center">Description of vibration shape</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">1</td><td class="align_center">↘</td><td class="align_center">↘</td><td class="align_center">Radial expansion of blade and wheel</td></tr><tr><td class="align_left">2–38</td><td class="align_center">↘</td><td class="align_center">—</td><td class="align_center">First-order bending vibration of blade</td></tr><tr><td class="align_left">39</td><td class="align_center">↘</td><td class="align_center">↘</td><td class="align_center">First-order blade bending with 0 nodal diameter</td></tr><tr><td class="align_left">40–77</td><td class="align_center">↘</td><td class="align_center">↗</td><td class="align_center">Distorted vibration of blade</td></tr><tr><td class="align_left">78</td><td class="align_center">—</td><td class="align_center">—</td><td class="align_center">Wheel vibration with 0 nodal diameter</td></tr><tr><td class="align_left">79–120</td><td class="align_center">↘</td><td class="align_center">↘</td><td class="align_center">Blade bending vibration with nodal diameter</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td>“—” stands for no obvious change, “↗” stands for rise, and “↘” stands for decline. </td></tr></table>

Effect law of blisk natural frequencies with the increase of blade aspect ratio.

Shock and Vibration

tab5

Table 5

Table 5: Vibration Analysis of Aeroengine Blisk Structure Based on a Prestressed CMS Super-Element Method 