103 Body roll stability analysis

When a vehicle turns a corner the centrifugal force produced acts outwards through the centre of gravity of the sprung mass, but it is opposed by the tyre to ground reaction so that the vehicle will tend to overturn. An overturning moment is therefore generated which tends to transfer weight from the inner wheels to the outside wheels. At the same time due to the flexibility and softness of the suspension, the body rolls so that in effect it overhangs and imposes an additional load to the outer wheels.

The opposition to any body roll will be shared out between the front and rear suspension according to their roll resistance. Thus if the front suspension roll stiffness with an anti-roll bar is twice that of the rear, then the front wheels will sustain two thirds of the roll couple while the rear ones only carry one third.

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