A brief study investigating the driveline components significance on the vibration modes of the system.

1. 1
ADJUSTABLE DRIVELINE EFFECT ON MODE
SHAPES AND NODAL DISTRIBUTION
|STUDY
Ra’uf Tailony
03/16/2017
INITIAL CONDITIONS
Actual Input torque = 300 N.m.
Average rotating speed = 150 rpm.
I4 Engine.
SHORT SPINDLE EFFECT
Figure (1): 3D model of a driveline with a shortened spindle.
- Spindle shortened.
- Structure is well supported
Node5
Node2, 3
Bearing 1 Bearing 2, 3 Bearing 4

2. 2
Mode Frequency
1 104
2 1899
3 1900
4 1977
5 3210
Figure (2): Frequency values of the system shown in figure (1).
EXTERNAL MASS EFFECTS
Figure (3): 3D model of a driveline with external mass attached.
Figure (4): 3D model of a driveline without external mass.
Node2 Node4
External massBearing
BearingNode2Node4

3. 3
Mode Frequency (Without ext. mass) Frequency (With ext. mass)
1 99 90
2 130 130
3 135 139
4 583 560
5 589 580
Figure (5): Frequency values with and without external mass.
- Mounting external mass on various locations along the drive line didn’t affect the frequency values as
much as needed but it only could change the vibration nodes locations of the system. As shown in
figures 3 and 4, by adding the external mass to the right side of the driveline made the node2 and 4 to
change positions in a nonlinear manner.