Outer ring
                                                            Inner ring
                                                            Inner ring
                                                            Outer ring

  : Detailed description of XJTU-SY datasets

SEU Gearbox Dataset
-------------------

SEU gearbox datasets were provided by Southeast University [@SEU; @shao2018highly]. SEU datasets contained two sub-datasets, including a bearing dataset and a gear dataset, which are both acquired on Drivetrain Dynamics Simulator (DDS). There are two kinds of working conditions with rotating speed - load configuration (RS-LC) set to be 20 Hz - 0 V and 30 HZ - 2 V shown in Table \[Tab\_5\]. The total number of classes is equal to twenty according to Table \[Tab\_5\] under different working conditions. Within each file, there are eight rows of vibration signals, and we use the second row of vibration signals.

\[Tab\_5\]

    Fault Mode        RS-LC          Fault Mode          RS-LC
  --------------- ------------- -------------------- -------------
    Health Gear    20 Hz - 0 V     Health Bearing     20 Hz - 0 V
    Health Gear    30 Hz - 2 V     Health Bearing     30 Hz - 2 V
   Chipped Tooth   20 Hz - 0 V       Inner ring       20 Hz - 0 V
   Chipped Tooth   30 Hz - 2 V       Inner ring       30 Hz - 2 V
   Missing Tooth   20 Hz - 0 V       Outer ring       20 Hz - 0 V
   Missing 