Axial Piston Pump Fault Diagnosis Method Based on Symmetrical Polar Coordinate Image and Fuzzy C-Means Clustering Algorithm

Table 5

The numbers of samples contained in the training set and test set.

State name	Training		Test
	Samples	Eigenvalues	Samples	Eigenvalues
Normal	20	80	20	80
Swash plate wear	20	80	20	80
Loose slipper	20	80	20	80
Sliding shoe wear	20	80	20	80