Anti-Dive/Lift and Brake Dive/Lift

Branch ID: 240

Request Number: 50000240

Table 1.
Component Unit Comment

1 (X): Left Front Anti-Dive or

Left Rear Anti-Lift

 % The resistance to diving in a front suspension or resistance to lifting in a rear suspension due to suspension geometry during braking. In a suspension with 100% anti-dive/lift the moment about the side view instant center due to weight transfer is exactly offset by the moment about the side view instant center due to the braking force. See the following equations:
Front Suspensions
acx = (front brake ratio)/2
aczleft = (cg height)/2/(wheel base)
aczright= (cg height)/2/(wheel base)
Orientation A:
dzfleft = acx*(C(3,1)-slr*C(3,5))+acx*(C(3,7)-slr*C(3,11))
dzfright = acx*(C(9,1)-slr*C(9,5))+acx*(C(9,7)-slr*C(9,11))
Orientation B:
dzfleft = acx*(-C(3,1)+slr*C(3,5))+acx*(-C(3,7)+slr*C(3,11))
dzfright = acx*(-C(9,1)+slr*C(9,5))+acx*(-C(9,7)+slr*C(9,11))
dzwleft = aczleft*C(3,3) + aczright*C(3,9)
dzwright = aczleft*C(9,3) + aczright*C(9,9)
left anti-dive = -100*dzfleft/dzwleft
right anti-dive = -100*dzfleft/dzwleft
Rear Suspensions
acx = (1-(front brake ratio))/2
aczleft = -(cg height)/2/(wheel base)
aczright= -(cg height)/2/(wheel base)
Orientation A:
dzfleft = acx*(C(3,1)-slr*C(3,5))+acx*(C(3,7)-slr*C(3,11))
dzfright = acx*(C(9,1)-slr*C(9,5))+acx*(C(9,7)-slr*C(9,11))
Orientation B:
dzfleft = acx*(-C(3,1)+slr*C(3,5))+acx*(-C(3,7)+slr*C(3,11))
dzfright = acx*(-C(9,1)+slr*C(9,5))+acx*(-C(9,7)+slr*C(9,11))
dzwleft = aczleft*C(3,3) + aczright*C(3,9)
dzwright = aczleft*C(9,3) + aczright*C(9,9)
left anti-lift = -100*dzfleft/dzwleft
right anti-lift = -100*dzfleft/dzwleft
2 (Y): Right Front Anti-Dive or Right Rear Anti-Lift % See Component 1 (above) for explanation and equations.
3 (Z): Average Front Anti-Dive or Rear Anti-Lift % The mean of components 1 and 2.

4 (RX): Left Front Dive or

Left Rear Lift

 mm/g The front suspension dive or rear suspension lift during braking or:
Front Suspensions
left dive = (dzfleft+dzwleft+aczleft/(tire stiffness))*weight
Rear Suspensions
left lift = -(dzfleft+dzwleft+aczleft/(tire stiffness))*weight

5 (RY): Right Front Dive or

Right Rear Lift

 mm/g The front suspension dive or rear suspension lift during braking or:
Front Suspensions
right dive = (dzfright+dzwright+aczright/(tire stiffness))*weight
Rear Suspensions
right lift = -(dzfright+dzwright+aczright/(tire stiffness))*weight
6 (RZ): Average Front Dive or Rear Lift mm/g The mean of components 4 and 5.