Gear root crack and bearing inner raceway fault

The figure shows the frequency domain diagram of bearing 1 and bearing 3 when root crack and raceway fault occur simultaneously. The main frequency components in figure (a) are as follows: frequency domain ๐‘“i (162.1hz) and its multiple frequency, the meshing frequency ๐‘“m (570.4hz) of the fault gear and the interval is the sideband of the rotor frequency. The main frequency components in figure (b) are: frequency doubling of outer raceway fault frequency of bearing 3, inner raceway fault frequency of bearing 1 and meshing frequency of fault gear.

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