6.3. ANALYSIS ON THE FORCED VIBRATION (FV) 89
6.3.1 INFLUENCE OF VARYING DAMPING OF TORSIONAL DAMPER
ON FREQUENCY RESPONSE
With the aim to analyze damping of torsional damper that influences the powertrain torsional
vibration (TV) under different kinds of excitations, the damping of the torsional damper is set
to 0.5, 0.75, 1, 1.25, and 1.50 of related parameters in the simulations. e torsional damper’
equivalent damping is 10 Nms/rad. Consequently, the damping is set to 5, 7.5, 10, 12.5, and
15 Nms/rad.
1. e engine is taken as input excitation.
When the engine provides the driving force and changes the TV damper damping value
for FV analysis, the TV frequency domain response of the planet carrier changes and the
forced analysis results are shown in Fig. 6.3.
80.0
60.0
40.0
20.0
0.0
-20.0
0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0
Frequency (Hz)
Magnitude
1 ?*?*?/???
1.5 ?*?*?/???
2 ?*?*?/???
2.5 ?*?*?/???
3 ?*?*?/???
Figure 6.3: Influence of damping on frequency response under engine excitation.
It can be seen from Fig. 6.3 that when the drive train is excited by the engine, the change
of the TV damper damping will cause a change in the resonance peak. e larger the
damping, the smaller the resonance peak of the drive train and more obvious the first and
second resonance peak changes relatively.
When the engine provides the driving force, the differential frequency response of the
torsion damper is shown in Fig. 6.4.
It can be seen from Fig. 6.4 that when the drive train is under the excitation of the engine,
the change of the TV damper damping will cause the change of the resonance peak of
the differential frequency domain response. e larger the damping, the smaller the reso-
nance peak of the drive train, the first and the second resonance peak of which change is
comparatively obvious. It is also shown in Fig. 6.4 that the change in the damping value
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