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

Figure 24

AUC-DLA-OB for identification of wheelset bearing roller fault. (a) Convergence process of solving constrained optimization problems; (b) filtering frequency band related to fault impulses; (c) filtered signal by filters in Figure 24(b); (d) learned shock responses; (e) sparse reconstruction signal; (f) locally zoomed figure of the impulses shown in Figure 24(e); (g) obtained location coefficients; and (h) locally zoomed figure of the location coefficients shown in Figure 24(g).