Damage Identification of a Derrick Steel Structure Based on the HHT Marginal Spectrum Amplitude Curvature Difference

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/1062949/figures/1062949.fig.009a.svgz" name="1062949.fig.009a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Before being damaged</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/sv/volume-2017/1062949/figures/1062949.fig.009b.svgz" name="1062949.fig.009b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>After being damaged</td></tr></table>

<div>Time-domain signal of sensors 1–12 before and after the damage of the derrick steel structure under Condition 1.</div>

Shock and Vibration

fig9

Figure 9

Figure 9: Damage Identification of a Derrick Steel Structure Based on the HHT Marginal Spectrum Amplitude Curvature Difference 