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

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Property</td><td class="align_center">Value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Length of the pipe (l) m</td><td class="align_center">1500</td></tr><tr><td class="align_left">Density of seawater (ρw) kg/m3</td><td class="align_center">1025</td></tr><tr><td class="align_left">Density of drill pipe (ρs) kg/m3</td><td class="align_center">7850</td></tr><tr><td class="align_left">Elastic modulus of steel (E) GPa</td><td class="align_center">206</td></tr><tr><td class="align_left">Outside diameter (D) mm</td><td class="align_center">127</td></tr><tr><td class="align_left">Thickness of pipe (δ) mm</td><td class="align_center">9.19</td></tr><tr><td class="align_left">Add mass coefficient (Ca)</td><td class="align_center">1</td></tr><tr><td class="align_left">Mass of tree and tool (WB) kg</td><td class="align_center">50000</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Mathematical Problems in Engineering

tab5

Table 5

Table 5: Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation 