Research Article
Fault Diagnosis of Wheel Flat Using Empirical Mode Decomposition-Hilbert Envelope Spectrum
Table 4
Effects of vehicle speeds on Hilbert envelope spectrum amplitude with dual flats.
| 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 | 7.7304 | 2.0983 | 4.9091 | | 90 | 8.6970 | 8.6964 | 2.1515 | 4.9308 | | 100 | 9.6633 | 9.6618 | 2.0665 | 4.5056 | | 110 | 10.6297 | 10.6293 | 1.9628 | 3.9305 | | 120 | 11.5960 | 11.5861 | 1.8422 | 3.5623 | | 130 | 12.5623 | 12.5612 | 1.6490 | 3.1250 | | 140 | 13.5287 | 13.5253 | 1.5864 | 2.9059 | | 150 | 14.4950 | 14.4844 | 1.4668 | 2.2312 | | 160 | 15.4613 | 15.4607 | 1.3247 | 1.9555 |
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