A Sparse Underdetermined Blind Source Separation Method and Its Application in Fault Diagnosis of Rotating Machinery

Table 2

Combination type of multiple faults of gearbox.

Combination faults type	Gears	Rolling bearings
		1	2	3	4
1	Normal	Normal	Inner race	Outer race	Normal

Note: 1, 2, 3, and 4 represent the bearings corresponding to the four measuring points, respectively.