Intelligent Diagnosis of Bogie Traction Seat Based on PCA-OVO and SVM Optimized by Modified Arithmetic Optimization Algorithm

Table 5

Frequency domain characteristic parameter values of the part of some small crack state samples.

The small crack state
Sample group	S1	S2	S3
Maximum value frequency	250.000	250.000	250.000
The power spectrum and	203469054.902	205739152.481	205720098.156
Root mean square spectrum	62595.389	66442.623	60399.422
Mean power spectrum	343454.929	352560.766	349299.300
Variance of power spectrum	345356.266	340903.784	338663.515
Power spectrum skewness	−4.660e − 09	−4.660e − 09	−4.659e − 09
Power spectrum kurtosis	0.000127	0.000136	0.000143
Relative peak of power spectrum	0.694	0.689	0.685