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

Figure 10

Relationship between the HHT marginal spectrum curvature difference or IMF instantaneous energy curvature difference and the sensors.

(a) Condition 1 (Sensors 6 and 7; HHT method)

(b) Condition 1 (Sensors 6 and 7; IMF method)

(c) Condition 2 (Sensors 6 and 7; HHT method)

(d) Condition 2 (Sensors 6 and 7; IMF method)

(e) Condition 3 (Sensors 3, 4, 9, and 10; HHT method)

(f) Condition 3 (Sensors 3, 4, 9, and 10; IMF method)