264
L. Yang et al.
(a) Motor normal
(b) Motor removed
1750.0
2050.0
1800
1900
2000
1820 1840 1860 1880
1920 1940 1960 1980
Linear
s
0
100
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
85.0
6.0
94.0
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
1950.0
2180.0
2000
2100
1980
2020 2040 2060 2080
2120 2140
Linear
s
0
100
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
85.0
6.0
94.0
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
Motor normal
Motor vertical
Motor removed
Motor vertical
Fig. 21.3 Time-frequency diagram of motor vertical vibration
the vehicle speed increases from 30 km/h to 80 km/h, the motor vibration acceleration
RMS gradually increases, from low speed to high speed by about 2–4 times. After
the motor is removed, the RMS value of the motor vibration acceleration decreased
by about 20%.
For the frequency of motor vibration, the frequency within 100 Hz of the vertical
time-frequency diagram of the motor is partially amplified, as shown in Fig. 21.3.
It can be seen that before and after the removal of the motor, the main frequency
of vibration remains unchanged, which is around 45 Hz and 65 Hz, and the main
frequency of 60–70 Hz is the P2 force frequency of the motor-car (P2 force is the
medium and low frequency force generated by the entire vehicle system and line
system by pulse excitation, the frequency is 30 ~ 100 Hz.).
21.3 Analysis of Vibration Characteristics of Axle Box
Three-direction acceleration sensors were arranged at the axle box (as shown in
Fig. 21.4), and the vehicle AW0 operating condition data was selected to analyze the
vibration characteristics of the bogie axle box. AW0 means no load. Regardless of
whether it is a trailer or a motor-car, the motor is normal or removed, the amplitude
of the vibration acceleration of the axle box is within 5 g on the normal section, and
the axle box acceleration of the switch impact section is up to 46 g. As the speed
increases, the vibration amplitudes in the three directions of the axle box continue to
increase. After the motor is removed, the RMS of the axle box vibration acceleration
increases slightly, but the increase is small, with a maximum of about 20%.
For the vibration frequency of the axle box, the main frequency of the motor is the
same before and after the motor is removed, but the energy that related to the main
frequency is slightly different, as shown in Fig. 21.5. Partially enlarge the 80 km/h
speed level, 0–700 Hz time-frequency diagram, as shown in Fig. 21.6. The axle box
has a P2 force frequency of about 60–70 Hz, a natural frequency of about 125 Hz,
and a natural frequency band of about 500 Hz. The axle box has a speed-related main
L. Yang et al.
(a) Motor normal
(b) Motor removed
1750.0
2050.0
1800
1900
2000
1820 1840 1860 1880
1920 1940 1960 1980
Linear
s
0
100
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
85.0
6.0
94.0
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
1950.0
2180.0
2000
2100
1980
2020 2040 2060 2080
2120 2140
Linear
s
0
100
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
85.0
6.0
94.0
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
Motor normal
Motor vertical
Motor removed
Motor vertical
Fig. 21.3 Time-frequency diagram of motor vertical vibration
the vehicle speed increases from 30 km/h to 80 km/h, the motor vibration acceleration
RMS gradually increases, from low speed to high speed by about 2–4 times. After
the motor is removed, the RMS value of the motor vibration acceleration decreased
by about 20%.
For the frequency of motor vibration, the frequency within 100 Hz of the vertical
time-frequency diagram of the motor is partially amplified, as shown in Fig. 21.3.
It can be seen that before and after the removal of the motor, the main frequency
of vibration remains unchanged, which is around 45 Hz and 65 Hz, and the main
frequency of 60–70 Hz is the P2 force frequency of the motor-car (P2 force is the
medium and low frequency force generated by the entire vehicle system and line
system by pulse excitation, the frequency is 30 ~ 100 Hz.).
21.3 Analysis of Vibration Characteristics of Axle Box
Three-direction acceleration sensors were arranged at the axle box (as shown in
Fig. 21.4), and the vehicle AW0 operating condition data was selected to analyze the
vibration characteristics of the bogie axle box. AW0 means no load. Regardless of
whether it is a trailer or a motor-car, the motor is normal or removed, the amplitude
of the vibration acceleration of the axle box is within 5 g on the normal section, and
the axle box acceleration of the switch impact section is up to 46 g. As the speed
increases, the vibration amplitudes in the three directions of the axle box continue to
increase. After the motor is removed, the RMS of the axle box vibration acceleration
increases slightly, but the increase is small, with a maximum of about 20%.
For the vibration frequency of the axle box, the main frequency of the motor is the
same before and after the motor is removed, but the energy that related to the main
frequency is slightly different, as shown in Fig. 21.5. Partially enlarge the 80 km/h
speed level, 0–700 Hz time-frequency diagram, as shown in Fig. 21.6. The axle box
has a P2 force frequency of about 60–70 Hz, a natural frequency of about 125 Hz,
and a natural frequency band of about 500 Hz. The axle box has a speed-related main