Project

Longitudinal load transfer and pitch compensation

Total weight		lbs	3750		Kg	1702.5	Newtons	16462.61
F/R ratio		55% front	2062.5		Kg	936.375	Newtons	9054.437
Weight Rear			1687.5		Kg	766.125	Newtons	7408.176
Wheelbase		Inches	98		mm	2489.2
C.G. Height		In.	17		mm	431.8	0.173469
Tire radius		In.	11.5		mm	292.1

Throttle Acceleration		ft/sec^2	16.25		m/s^2	4.87988	0.504658	half a \'g\' accleration
g		ft/sec^2	32.2		m/s^2	9.66967
Drive ratio		%front	0		%Rear	100

Front spring rate		lb/in	450		kg/mm	8.043307	N/mm	77.77612
Rear spring rate		lb/in	650		kg/mm	11.61811	N/mm	112.3433
Front spring Motion ratio		in/in	0.76		mm/mm	0.76
Rear spring motion ratio		in/in	0.72		mm/mm	0.72
Tire rate			1
Front wheel rate (actual)		lb/in	259.92		kg/mm	4.645814	N/mm	44.92349
Rear wheel rate (actual)		lb/in	336.96		kg/mm	6.022828	N/mm	58.23876

F SVIC vertical distance from contact patch		in	13.22		mm	335.788
F SVIC horizontal distance from contact patch	in	28.5		mm	723.9
R SVIC vertical distance from contact patch		in	16		mm	406.4
R SVIC horizontal distance from contact patch	in	42.5		mm	1079.5

Load Transfer due to motion:

Static loading due to weight distribution:		N	kg (N/g)	lbs/g
Wfront		9054.43694		2062.5
Wrear		7408.17568		1687.5

Dynamic Loading due to acceleration [dW]		1441.18289	149.0416	328.2854291
dWfront	In rebound	-1441.1829
dWrear	In jounce	1441.18289

C.G. location:

Deflection with zero compensation(function of wheel rate and load transfer):

Deflection due to dynamic loading \'Z\' considering zero \'Anti\' characteristics	mm/g	mm	in/g
Zfront	in rebound	1.65883806	16.04042	0.631512444
Zrear	In Jounce.	1.2795738	12.37306	0.487128189

Pitch angle	Degrees	degree/g	radians
θ	0.6543175	0.06766993	0.011415

Pitch gradient			0.011415	0.001180465

Dynamic load transfer as per drive configuration of vehicle:

Calculating \'Anti\' characteristics:

Front axle:

I.C. Location and \'Anti\' properties considering a \'Solid axle\' suspension	mm	radians	degrees	Ratio
Front end:		e\'	335.788			0.46386
		d\'	723.9
Front \'Anti-lift\' angle [θf]actual				0.43432	24.8973
For 100% anti lift swing arm angle [θf]ideal				0.17176	9.846123

*Front \'anti-lift\' %, ([θf]actual/ [θf]ideal)%front100*	0
100% RWD vehicle will have zero torque reaction forces at the front

Rear axle (for an independent rear suspension):

I.C. Location and \'Anti\' properties considering a \'Independent rear\' suspension
Rear end:	e\'=\'e-wheel radius\'	114.3			0.105882
	d\'	1079.5

Rear \'Anti-squat\' angle [θr]actual			0.105489	6.047158
For 100% anti squat swing arm angle [θr]ideal		0.17176	9.846123

*Rear \'anti-squat\' %, ([θf]actual/ [θf]ideal)(Driverear)100*				61.03806

Designing for Zero pitching:

3. Zero pitch condition (100% pitch compensation)
Rear end:		e\' fixed	406.4
		e1\'=\'e-wheel radius\'	114.3			0.424036
for zero pitch, Zfront = -Zrear.	Rear \'Anti-squat\' angle [θr]actual		0.401054	22.99036
Hence,
[dWfront(h/l) - (dWfront(e/d))Drive ratio front] /Kfornt = - [dWrear(h/l) -dWrear(e/d)Drive ratio rear] / Krear
where, dW(h/l) is the dynamic load, and dW(e/d) is the \'Anti\' characteristics force.
for 100% RWD vehicle,
*[dWfront(h/l)] /Kfornt = - [dWrear(h/l) -dWrear(e/d)Drive ratio rear] / Krear**
Now,
(Krear/Kfornt) = [-(h/l)+(e/d)] / (h/l)
0.424036281
			958.4086
d1\' for 100% pitch compensation,			269.5524

*Rear \'anti-squat\' % (for 0 pitch), ([θf]actual/ [θf]ideal)(Driverear)100*					244.4444
Front \'anti-lift\' %, (for zero pitch) ([θf]actual/ [θf]ideal)%front100					0
100% RWD vehicle will have zero torque reaction forces at the front hence, even in the 0 pitch condition all the forces are transmitted through rear suspension links and hence the 244% anti-squat.

Deflections at the axles for 100% pitch compensation:

Deflection due to dynamic loading \'Z\' considering \'Anti\' characteristics(244% anti-squat)	mm	in/g
Zfront = [dWfront(h/l)] /Kfornt	in rebound	mm/g 1.91628973	18.52989	0.729523176
Zrear = [dWrear(h/l) -dWrear(e/d)*Drive ratio rear] / Krear	(-) in rebound	-0.1326662	-18.5299	-0.05050545

Pitch angle	0	0

drive link to the excel sheet:

Ship work like this
in your own course.