Research Article
Vibration Sideband Modulations and Harmonics Separation of a Planetary Helicopter Gearbox with Two Different Configurations
Table 2
Shaft and gear mesh frequencies.
| ā | Frequency of interest (Hz) | Three planets | Four planets | Relationships and calculations |
| Stage | Input shaft frequency | 100.00 | 100.00 | ā | Pinion/bevel mesh frequency | 1900.00 | 1900.00 | Number of teeth of the bevel pinion times input shaft frequency | Bevel gear shaft speed | 26.76 | 26.76 | Input shaft frequency/1st-stage reduction ratio |
| Stage | Carrier frequency (output arm speed) | 5.73 | 5.73 | Input shaft frequency/overall reduction ratio | Epicyclic mesh frequency | 567.71 | 567.71 | Number of teeth of the ring gear times carrier frequency | Planet pass frequency | 17.20 | 22.94 | Number of planets times the carrier frequency |
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