21 Study on Vibration Characteristics of Metro Bogie …
265
0.0
0.2
0.4
0.6
0.8
1.0
RMS
speed/km/h
Axle box-longitudinal
0.0
0.2
0.4
0.6
0.8
1.0
RMS
speed/km/h
Axle box-transverse
30
40
50
60
70
80
30
40
50
60
70
80
30
40
50
60
70
80
0.0
0.2
0.4
0.6
0.8
1.0
RMS
speed/km/h
Axle box-vertical
Fig. 21.4 Root mean square value of shaft box vibration before and after motor removal
0.5
2828.9
1000
2000
Linear
s
0
1000
100.0
200.0
300.0
400.0
500.0
600.0
700.0
800.0
900.0
150.0
250.0
350.0
450.0
550.0
650.0
750.0
850.0
60.0
940.0
Linear
Hz
1.26e-6
1.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
0.15
0.25
0.35
0.45
0.55
0.65
0.75
0.85
Amplitude
g
0.5
2378.9
1000
2000
Linear
s
0
1000
100.0
200.0
300.0
400.0
500.0
600.0
700.0
800.0
900.0
150.0
250.0
350.0
450.0
550.0
650.0
750.0
850.0
60.0
940.0
Linear
Hz
1.26e-6
1.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
0.15
0.25
0.35
0.45
0.55
0.65
0.75
0.85
Amplitude
g
200 400 600 800
1200 1400 1600 1800
2200 2400
200 400 600 800
1200 1400 1600 1800
Motor normal
Axle box longitudinal
Motor removed
Axle box longitudinal
Fig. 21.5 Time-frequency diagram of longitudinal vibration of axle box between motor normal
and motor removed
frequency of 150 Hz (speed 80 km/h, wavelength about 0.15 m). The trailer does not
have such a main frequency, which may be related to the permanent magnet motor.
21.4 Characteristics of Vibration Transmission
The vibration transmission on the bogie is mainly analyzed in two parts: axle boxend of the frame-bottom of the car body-passenger compartment floor and root of