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

Table 4

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

The normal state
Sample group	N1	N2	N3
Maximum value frequency	251.000	249.000	250.000
The power spectrum and	1848944.646	1849363.866	1881778.828
Root mean square spectrum	5603.898	5773.967	5785.471
Mean power spectrum	3081.574	3080.663	3023.802
Variance of power spectrum	3129.845	3016.810	3016.651
Power spectrum skewness	−4.675e − 09	−4.676e − 09	−4.676e − 09
Power spectrum kurtosis	0.000015	0.000012	0.000012
Relative peak of power spectrum	6.658	6.669	5.231