Research Article
Vestas V90-3MW Wind Turbine Gearbox Health Assessment Using a Vibration-Based Condition Monitoring System
Table 5
Rotational frequencies for each stage.
| Gear stage | Frequency (orders) | Planet carrier/gear | Planet | Sun/pinion |
| Planetary stage I | 1x | 1.59x | 5.8x | Planetary stage II | 5.8x | 8.5x | 37.9x | Helical stage III | 37.9x | ā | 104.5x |
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