Machine Fault Detection Based on Filter Bank Similarity Features Using Acoustic and Vibration Analysis

Figure 4

Exemplary of computed narrow-band decompositions for a wind turbine under undamaged condition with air jets on for vibration (top row) and acoustic (bottom row). Note that the smaller the cardinal of narrow-bandwidth, the higher its spectral content.

(a) EMD

(b) WPT

(c) FFB