Experimental and Computational Modal Analyses for Launch Vehicle Models considering Liquid Propellant and Flange Joints

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Modes</td><td class="align_center">First bending mode (Hz)</td><td class="align_center">Second bending mode (Hz)</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Modal test</td><td class="align_center">123.6</td><td class="align_center">373.6</td></tr><tr><td class="align_left">MSC.NASTRAN</td><td class="align_center">134.3</td><td class="align_center">378.3</td></tr><tr><td class="align_left">Error (%)</td><td class="align_center">8.65</td><td class="align_center">1.26</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Modal test and analysis results (filling ratio: 25%; number of flange joints: 24).

International Journal of Aerospace Engineering

tab6

Table 6

Table 6: Experimental and Computational Modal Analyses for Launch Vehicle Models considering Liquid Propellant and Flange Joints 