Structural Damage Identification Based on the Wavelet Transform and Improved Particle Swarm Optimization Algorithm

Figure 27

Wavelet coefficients with and without noise. (a) Wavelet coefficient with SNR 2 dB. (b) Wavelet coefficient with SNR 10 dB. (c) Denoising of the wavelet coefficient with SNR 2 dB. (d) Denoising of the wavelet coefficient with SNR 10 dB.

(a)

(b)

(c)

(d)