Research on NOFRF Entropy-Based Detection Method for Early Damage of Pillar Porcelain Insulator

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Material</td><td class="align_center"><i>E</i> (MPa)</td><td class="align_center">Poisson’s ratio</td><td class="align_center">Density, <i>t</i> (mm³)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Porcelain</td><td class="align_center">118000</td><td class="align_center">0.16</td><td class="align_center">2.6<i>e</i> − 9</td></tr><tr><td class="align_left">Cast iron</td><td class="align_center">175000</td><td class="align_center">0.28</td><td class="align_center">7.8<i>e</i> − 9</td></tr><tr><td class="align_left">Cement</td><td class="align_center">31000</td><td class="align_center">0.215</td><td class="align_center">2.3<i>e</i> − 9</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Material parameters of pillar porcelain insulator.</div>

Shock and Vibration

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Table 4

Table 4: Research on NOFRF Entropy-Based Detection Method for Early Damage of Pillar Porcelain Insulator 