Fault Diagnosis of Wheel Flat Using Empirical Mode Decomposition-Hilbert Envelope Spectrum

Figure 15

Hilbert envelope spectrum based on EMD with dual flats having different phase differences (=100km/h). (a) Hilbert envelope spectrum of IMF1 with different phase differences. (b) The sum of Hilbert envelope spectrum of IMF1-IMF3 of the flat with different phase differences.

(a)

(b)