The ratio of suspension extension due to braking forces to the suspension compression due to weight transfer. Anti-dive under braking is computed for the front suspension only and only in a full-vehicle analysis.
Computed by:
SVCANB
Input Variables Used:
■Compliance matrix
■Average tire loaded radius
■Front braking ratio (fbrat)
■Total CG height
■Average wheelbase
Method:
SVC first computes longitudinal force due to braking:
Fleft = Fright = fbrat / 2.0
and the vertical force due to weight transfer:
Wleft = Wright = Total CG height / ( 2 wheelbase )
These are forces at each wheel per unit total braking force.
Vertical deflections due to the vertical force are:
Zwleft = Wleft C( 3,3 ) + Wright C( 3,9 )
Zwright = Wleft C( 9,3 ) + Wright C( 9,9 )
Vertical deflections due to tractional forces are:
Zfleft = Fleft [C( 3,1 ) - Rl C( 3,5 )] + Fright [C( 3,7 ) - Rl C( 3,11 )]
Zfright = Fleft [C( 9,1 )-Rl C( 9,5 )]+ Fright [C( 9,7 ) -Rl C( 9,11 )]
where Rl is the average loaded radius of the tire.
The percent anti-dive is:
Left percent anti-dive = -100. Zfleft / Zwleft
Right percent anti-dive = -100. Zfright / Zwright