Predictive Modeling of a Two-Stage Gearbox towards Fault Detection

Table 2

Expected frequencies (Hz) from gearbox operating at 820 r/min.

ΔGMF	GMF2	GMF1	2 × GMF2	GMF1 + ΔGMF	3 × GMF2	2 × GMF1	4 × GMF2	3 × GMF1 and 5 × GMF2	4 × GMF1
175	262	437	525	612	787	875	1050	1312	1750

GMF: gear mesh frequency.
The difference between gear mesh frequencies of the first and second gear pairs.