Train Wheelset Bearing Multifault Impulsive Component Separation Using Hierarchical Shift-Invariant Dictionary Learning

Figure 7

Separated second impulse signal using H-SI-K-SVD: (a) SES values for different number of iterations; (b) time-domain waveform of ; (c) Fourier spectrum of (b); (d) Hilbert envelope spectrum of (c).

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(b)

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(d)