Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Natural frequency (Hz)</td><td class="align_center">1st</td><td class="align_center">2nd</td><td class="align_center">3rd</td><td class="align_center">4th</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">DTM</td><td class="align_center">0.01248</td><td class="align_center">0.03769</td><td class="align_center">0.06763</td><td class="align_center">0.09893</td></tr><tr><td class="align_left">FEM</td><td class="align_center">0.01135</td><td class="align_center">0.03414</td><td class="align_center">0.06153</td><td class="align_center">0.09011</td></tr><tr><td class="align_left">Error (%)</td><td class="align_center">9</td><td class="align_center">9.4</td><td class="align_center">9</td><td class="align_center">8.9</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Mathematical Problems in Engineering

tab6

Table 6

Table 6: Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation 