Feature Clustering Analysis Using Reference Model towards Rolling Bearing Performance Degradation Assessment

Table 1

Original features.

Number	Time domain	Number	Frequency domain
f1	Maximum peak value	f9	r30
f2	Absolute mean	f10	r31
f3	Root mean square	f11	r32
f4	Variance	f12	r33
f5	Square root value	f13	r34
f6	Kurtosis	f14	r35
f7	Crest factor	f15	r36
f8	Shape factor	f16	r37