Damage Identification in Structures Based on Energy Curvature Difference of Wavelet Packet Transform

Figure 21

Wavelet packet coefficients corresponding to the 24th node in case S1 in Example 2.

(a) Knot (1,0)

(b) Knot (1,1)

(c) Knot (2,0)

(d) Knot (2,1)

(e) Knot (3,0)

(f) Knot (3,1)

(g) Knot (4,0)

(h) Knot (4,1)