Fatigue Stress Estimation of an Offshore Jacket Structure Based on Operational Modal Analysis

<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">Mode 1</td><td class="align_center">Mode 2</td><td class="align_center">Mode 3</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Experimental frequency (Hz)</td><td class="align_center">0.514</td><td class="align_center">0.527</td><td class="align_center">1.234</td></tr><tr><td class="align_left">Numerical frequency (Hz)</td><td class="align_center">0.515</td><td class="align_center">0.518</td><td class="align_center">1.229</td></tr><tr><td class="align_left">Error (%)</td><td class="align_center">−0.121</td><td class="align_center">1.799</td><td class="align_center">0.387</td></tr><tr><td class="align_left" colspan="4"><hr/></td></tr><tr><td class="align_left">Modal Assurance Criterion (MAC)</td><td class="align_center">0.998</td><td class="align_center">0.997</td><td class="align_center">0.982</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison between experimental and numerical modal properties.</div>

Shock and Vibration

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Table 2

Table 2: Fatigue Stress Estimation of an Offshore Jacket Structure Based on Operational Modal Analysis 