Damage Identification by Using a Self-Synchronizing Multipoint Laser Doppler Vibrometer

Figure 3

(a) Out-of-plane displacement distribution of one sampling point on the intact beam in the first 0.08 s after trigger; spectrum of the displacement distribution of (b) intact beam; (c) cracked beams with ; (d) cracked beams with .

(a)

(b)

(c)

(d)