Research Article
Fault Diagnosis of Wheel Flat Using Empirical Mode Decomposition-Hilbert Envelope Spectrum
Table 2
Effects of vehicle speeds on Hilbert envelope spectrum amplitude with single flat.
| Speed
(km/h) | Theoretical frequency
(Hz) | Actual frequency
(Hz) | Amplitude of IMF1Hilbert envelope spectrum (m/s2) | Sum of Hilbert envelope spectrum amplitude of IMF1-IMF3 (m/s2) |
| | 80 | 7.7307 | 7.7316 | 2.7589 | 4.8903 | | 90 | 8.6970 | 8.6964 | 1.6721 | 3.7488 | | 100 | 9.6633 | 9.6628 | 1.7595 | 4.8029 | | 110 | 10.6297 | 10.6281 | 1.7345 | 4.5039 | | 120 | 11.5960 | 11.5861 | 1.7944 | 3.6251 | | 130 | 12.5623 | 12.5612 | 1.5507 | 2.8009 | | 140 | 13.5287 | 13.5281 | 1.0633 | 2.5875 | | 150 | 14.4950 | 14.4949 | 0.9039 | 2.1588 | | 160 | 15.4613 | 15.4607 | 0.7424 | 1.8348 |
|
|
