Table 2: Shaft and gear mesh frequencies.

Frequency of interest (Hz)Three planetsFour planets Relationships and calculations

Stage Input shaft frequency100.00100.00
Pinion/bevel mesh frequency1900.001900.00Number of teeth of the bevel pinion times input shaft frequency
Bevel gear shaft speed26.7626.76Input shaft frequency/1st-stage reduction ratio

Stage Carrier frequency (output arm speed)5.735.73Input shaft frequency/overall reduction ratio
Epicyclic mesh frequency567.71567.71Number of teeth of the ring gear times carrier frequency
Planet pass frequency17.2022.94Number of planets times the carrier frequency