Deep Transfer Learning-Based Fault Diagnosis for Gearbox under Complex Working Conditions

Table 1

Cohesion evaluation.

Step	Process parameter	Equation
1	Intracategory distance
2	Average intracategory distance
3	Difference of intracategory distance
4	Average of each feature
5	Average intercategory distance
6	Difference between categories
7	Distance weighting factor
8	Distance evaluation factor
9	Intracategory standard deviation
10	Average intracategory standard deviation
11	Difference of intracategory standard deviation
12	Distance of each feature
13	Quadratic sum of feature distance
14	Standard deviation of feature distance (intracategory cohesion)
15	Average intercategory cohesion difference
16	Imparity measure of intercategory cohesion difference
17	Cohesion weighting factor
18	Cohesion factor