*4.1. Experimental Verification*

Figure 3 shows two correlated subspaces of the input dataset. Figure 3a shows each input variable in the data set *Px*. The charts of variables from top to bottom belong to bogie 1, bogie 2, motor-driven side bearing, and non-driven side bearing, respectively. Figure 3b shows each variable in the data set *Py*. From top to bottom, the charts represent motor side big gear, wheel side pinion, wheel side motor big gear, and motor side pinion, respectively.


**Figure 4.** Experiment results of CCA-JITL FD model. (**a**) Data matrix *Px* detection; (**b**) Data matrix *Py* detection.
