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276 Multibody Systems Approach to Vehicle Dynamics
possible for riders to incline the motorcycle to produce camber angles
between the tyre and road in excess of 45°, resulting in camber thrust being
the most significant component of lateral force.
5.4.9 Combinations of camber and slip angle
The treatment so far has considered the generation of lateral force due to
slip angle and camber angle in isolation. For a road car, while slip angle
dominates the generation of lateral force, some amount of camber will
occur at the same time. The effect of adding camber to slip angle is shown
in Figure 5.30 where for a given tyre load the lateral force against slip angle
curve is plotted at 0°, 5° and 10° of camber angle. It should be noted that
Aligning moment M z (Nm)
Slip angle = 0
F z = 8 kN
F z = 6 kN
F z = 4 kN
F z = 2 kN
φ
Aligning moment camber stiffness = tan φ
Camber angle (degrees)
Fig. 5.29
Plotting aligning moment versus camber angle
Lateral force F y (N)
Camber angle = 0°
Camber angle = 5°
Camber angle = 10°
Fig. 5.30
Slip angle (degrees)
The effect of combined camber and slip angle on lateral force