21 Study on Vibration Characteristics of Metro Bogie …
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the vibration characteristics of the motor and the gear box; the vibration transmission characteristics of the axle box, frame, the bottom of car body, the passenger
compartment floor and the root-end of traction rod seat are analyzed as well.
21.2 Vibration Characteristics of Motor
Motor vibration has an important impact on the stability of the bogie. Therefore,
three-direction acceleration sensors were arranged on the motor of the motor-car
bogie. The vibration characteristics of the motor under normal operation and motor
removal at different speeds are analyzed and compared, so as to obtain the vibration
characteristics of permanent magnet synchronous motor. No matter in normal or
removal conditions, the vibration acceleration of the motor is within 5 g on the nonimpact section, and the maximum motor acceleration is about 200 g on the impact
section of the switch. For the comparison of the acceleration before and after the
motor is removed, the RMS value of the acceleration is adopted, and the 1 s window
is used, and the moving window is 1 s without overlap. The data of the turnout has
been eliminated during the calculation process. The result is shown in Fig. 21.2. As
0.0
0.4
0.8
1.2
1.6
RMS
speed/km/h
Motor longitudinal
0.0
0.4
0.8
1.2
1.6
RMS
speed/km/h
Motor transverse
30
40
50
60
70
80
30
40
50
60
70
80
30
40
50
60
70
80
0.0
0.4
0.8
1.2
1.6
RMS
speed/km/h
Motor vertical
Fig. 21.2 Root mean square value of motor vibration