Gear root crack and bearing rolling element 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: double frequency 2๐‘“b (141hz) of rolling element fault, ๐‘“o (107.3hz) of rolling bearing outer raceway fault And the meshing frequency of faulty gear ๐‘“m (570.4hz). The main frequency components in figure (b) are: double frequency 2๐‘“b (141hz) of rolling element fault and other frequency multiplication, frequenc ๐‘“o (107.3hz) of outer raceway fault frequency of bearing 1, and 2 ๐‘“o3 (85.25hz) of outer raceway fault frequency of bearing 3 the meshing frequency of the fault gear is ๐‘“m (570.4hz).

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