Anti-Dive/Lift and Brake Dive/Lift

Branch ID: 240

Request Number: 80000240

Table 1.
.plt File .mr, .abf File Component Unit Comment
F1 RESULT(1) Not Used Not Used Not Used
F2 RESULT(2)

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
F3 RESULT(3) Right Front Anti-Dive or Right Rear Anti-Lift % See F2/RESULT(2) (above) for explanation and equations.
F4 RESULT(4) Average Front Anti-Dive or Rear Anti-Lift % The mean of the left and right front anti-drive or left and right rear anti-lift.
F5 RESULT(5) Not Used Not Used Not Used
F6 RESULT(6)

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
F7 RESULT(7)

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
F8 RESULT(8) Average Front Dive or Rear Lift mm/g The mean of the left and right front drive or left and right rear lift.