4569846498

174 Multibody Systems Approach to Vehicle Dynamics
suspension without a roll bar C 3,9 would be zero in the absence of any
mechanical coupling between the left and right suspension systems. The
other elements of the compliance matrix are defined similarly.
As stated the compliance matrix approach is well suited to investigate the
effects of suspension movement due to compliance. By way of further
example consider the definition used in ADAMS/Car for the calculation of
Aligning torque Steer and camber compliance.
The aligning torque steer compliance is the change in steer angle due to
unit aligning torques applied through the wheel centres. Similarly the
aligning torque camber compliance is the change in camber angle due to
unit aligning torques acting through the wheel centres.
Figure 4.33 illustrates the determination of steer angle resulting at the right
wheel due to unit aligning torques acting through both the left and right
wheel centres. Note that the usual symbol for steer angle is . For the
Left wheel
centre
Tz LW
Right wheel
centre
Z
Tz RW
Az RW
X
Y
Fig. 4.33 Steer angle at right wheel due to aligning torques at left and
right wheels
Ax RW
Left wheel
centre
Tz LW
Right wheel
centre
Z
Tz RW
X
Y
Fig. 4.34 Camber angle at right wheel due to aligning torques at left and
right wheels