Study on the Damage Diagnosis of Ancient Wood Structure in Tianshui under Traffic Excitation

Figure 11

Sum of wavelet packet energy curvature difference under noise 10 db–50 db. (a) 10 db. (b) 20 db. (c) 30 db. (d) 40 db. (e) 50 db.

(a)

(b)

(c)

(d)

(e)