90 6. MODELING OF THE HYBRID POWERTRAIN WITH ADAMS
1 ?*?*?/???
1.5 ?*?*?/???
2 ?*?*?/???
2.5 ?*?*?/???
3 ?*?*?/???
80.0
60.0
40.0
20.0
0.0
-20.0
-40.0
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
Figure 6.4: Influence of damping on frequency response under the engine excitation.
of the torsional damper does not cause a change in the natural frequency of the hybrid
powertrain.
2. e electric motor is chosen as input excitation.
In this part, the large motor is used as the excitation source to calculate the FV, and the
frequency response of the torsional damper to the planetary frame and differential in the
transmission system is analyzed. Furthermore, find the law of the influence of the TV of
the torsion damper on the TV of the drive train under the excitation of a large motor.
Figure 6.5 shows the effect of torsional damper damping characteristics on the frequency
domain response of the planetary frame excited by a large motor. e effect of torsional
damper damping characteristics on the frequency domain response of the differential ex-
cited by a large motor is shown in Fig. 6.6.
From the results of Figs. 6.5 and 6.6, it can be seen that the response peak value of trans-
mission system components at resonance point decreases with the increase of torsional
damper damping under the excitation of a large motor, and the peak value of the second
resonance point decreases obviously. It is also shown from the graph that the damping
of torsional damper has no effect on the response of high-frequency stage. In addition,
the damping of torsion damper does not affect the natural frequency of the hybrid power
train.
6.3. ANALYSIS ON THE FORCED VIBRATION (FV) 91
90.0
62.5
35.0
7.5
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 6.5: Influence of damping on frequency response under the excitation of motor 2.
1 ?*?*?/???
1.5 ?*?*?/???
2 ?*?*?/???
2.5 ?*?*?/???
3 ?*?*?/???
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
80.0
60.0
40.0
20.0
0.0
-20.0
-40.0
Figure 6.6: Influence of damping on frequency response under the excitation of motor 2.
6.3.2 INFLUENCE OF VARYING STIFFNESS OF TORSIONAL DAMPER
ON FREQUENCY RESPONSE
With the aim to analyze the damper’s TS that influences the powertrain TV, the TS of torsional
damper is set to 0.5, 0.75, 1, 1.25, and 1.50 of related parameters. e TS of the torsional damper
is 618. Consequently, the TS of torsional damper is set to 309, 463, 618, 772, and 972 Nms/rad.
1. e engine is taken as input excitation.
92 6. MODELING OF THE HYBRID POWERTRAIN WITH ADAMS
e engine is used as the excitation source, and the TS of the TV damper is changed to
perform the FV analysis. e frequency domain response of the planet carrier is shown in
Fig. 6.7, and the frequency domain response of the differential is shown in Fig. 6.8.
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 6.7: Influence of stiffness on frequency response under the engine excitation.
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
-40.0
309 ?*?/???
463 ?*?/???
618 ?*?/???
772 ?*?/???
927 ?*?/???
Figure 6.8: Influence of stiffness on frequency response under the engine excitation.
Figures 6.7 and 6.8 demonstrate 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.
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