Health Monitoring for a Structure Using Its Nonstationary Vibration

Figure 3

Power frequency response of the model structure A estimated by the average DFT spectrum (a), (b), and (c) and the SIP distribution (b), (d), and (f). (a) and (b) Stationary random vibration. (c)–(f) Nonstationary vibration. Relative frequency is given by 𝑛=𝑓_𝑛/10.

(a)

(b)

(c)

(d)

(e)

(f)