An Enhanced VMD with the Guidance of Envelope Negentropy Spectrum for Bearing Fault Diagnosis

Table 5

Geometry and characteristic frequencies of the rolling bearing.

6205-2RS JEM SKF	Ball numbers	Ball diameter	Bearing mean diameter
	9	7.94 mm	39.04 mm
Fault type
Fault characteristic frequency (Hz)	162.18	107.37	70.59