Research Article
Fault Diagnosis of Wheel Flat Using Empirical Mode Decomposition-Hilbert Envelope Spectrum
Table 5
Effects of phase difference on Hilbert envelope spectrum amplitude with dual flats.
| Phase different
(°) | Theoretical frequency
(Hz) | Actual frequency
(Hz) | Amplitude of IMF1Hilbert envelope spectrum (m/s2) | Sum of Hilbert envelope spectrum amplitude of IMF1-IMF3 (m/s2) |
| | 45 | 9.6633 | 9.6628 | 3.9828 | 6.4230 | | 90 | 9.6633 | 9.6628 | 3.5167 | 6.8270 | | 135 | 9.6633 | 9.6628 | 2.1765 | 4.7171 | | 180 | 9.6633 | 9.6628 | 2.0034 | 4.6479 | | 225 | 9.6633 | 9.6628 | 2.0981 | 4.6475 | | 270 | 9.6633 | 9.6628 | 2.3238 | 2.3238 | | 315 | 9.6633 | 9.6628 | 2.7706 | 2.7706 |
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