Fault Detection and Behavior Analysis of Wheelset Bearing Using Adaptive Convolutional Sparse Coding Technique Combined with Bandwidth Optimization

Figure 20

AUC-DLA-OB for identification of wheelset bearing outer race fault. (a) Convergence process of solving constrained optimization problems; (b) filtering frequency band related to fault impulses; (c) filtered signal by filters in Figure 20(b); (d) learned shock responses; (e) sparse reconstruction signal; (f) locally zoomed figure of the impulses shown in Figure 20(e); (g) obtained location coefficients; and (h) locally zoomed figure of the location coefficients shown in Figure 20(g).