Online Modal Identification of Concrete Dams Using the Subspace Tracking-Based Method

Figure 11

Frequency identification results of the first two modes using vibration signals with different SNR values for simulation case 1 (blue line represents the theoretical value of the frequency, and red line represents the identified value of the frequency): (a) no noise; (b) SNR = 50 dB; (c) SNR = 40 dB; (d) SNR = 30 dB.

(a)

(b)

(c)