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Shock and Vibration
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2020
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Article
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Tab 3
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Research Article
Research on NOFRF Entropy-Based Detection Method for Early Damage of Pillar Porcelain Insulator
Table 3
Damage detection index value of pillar porcelain insulator under hammer excitation.
Fe (1)
Fe (2)
Fe (3)
Fe (4)
N
E
Healthy
0.95251
0.04695
0.00055
2.34
E
− 6
0.21664
Prefabricated crack
0.90988
0.08890
0.00121
5.10
E
− 06
0.35388