6.3. ANALYSIS ON THE FORCED VIBRATION (FV) 93
It can be seen from Figs. 6.7 and 6.8 that increasing the stiffness of the TV damper makes
the frequency domain response amplitude of the powertrain larger, and reducing the TS
of the TV damper can reduce the TV of the drive train, especially in the low-frequency
phase, the ride comfort of the car can be improved. In addition, it can be concluded from
Figs. 6.7 and 6.8 that increasing the torsional rigidity of the TV damper causes the first and
second natural frequencies of the powertrain to change, and the TS is larger, the greater
the natural frequency of the first order and the second order, and the change in stiffness
has no effect on the third-order natural frequency.
2. e electric motor is taken as input excitation.
e large motor is used as the excitation source to change the TS of the TV damper. e
FV analysis is finished in the ADAMS dynamic model. e frequency domain response of
the planet carrier is shown in Fig. 6.9. e frequency domain response of the differential
is shown in the figure.
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0
Fr
equency (Hz)
Magnitude
80.0
60.0
40.0
20.0
0.0
-20.0
309 ?*?/???
463 ?*?/???
618 ?*?/???
772 ?*?/???
927 ?*?/???
Figure 6.9: Influence of stiffness on frequency response under the excitation of motor 2.
It can be seen from Figs. 6.9 and 6.10 that under the excitation of the large sun gear, the
change of the TV of the torsion damper causes the first and second natural frequencies of
the powertrain to change, and the greater the stiffness, the greater the natural frequency;
the conclusion can be drawn that increasing the stiffness of the TV damper makes the first-
order resonance peak become larger, and the second-order peak does not change; under the
excitation of the large motor, increasing the TS of the TV damper to the high-frequency
response of the transmission system has no effect.
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