Week 3 - Set 2 - Anti-Characteristics.xlsx

	A	B	C	D	E
1	Anti-Characteristics
2
3	Given Inputs
4			Parameters	Units	Values
5			Total Weight	lbs	3750.00
6			F/R Distribution	% Front	55%
7			Wheelbase	in	98.00
8			CG Height	in	17.00
9			Tyre Radius	in	11.50
10
11			Throttle Acceleratoin	ft / Sec2	16.25
12			Acceleration by Gravity	ft / Sec2	32.20
13			Drive Ratio F/R	% Front	0.00
14
15			Front Spring Rate	lb/in	450.00
16			Rear Spring Rate	lb/in	650.00
17			Front Spring Motion Ratio		0.76
18			Rear Spring Motion Ratio		0.72
19
20			Front IC Vertical distance fron Contact Patch	in	13.22
21			Front IC Horizontal distance fron Contact Patch	in	28.50
22			Rear IC Vertical distance fron Contact Patch	in	16.00
23			Rear IC Horizontal distance fron Contact Patch	in	42.50
24
25	Derived Values
26
27			Weight Distribution
28			Front Weight	lbs	2062.5
29			Rear Weight	lbs	1687.50
30
31			**Throttle Acceleration per g =	Throttle Acceleration / Acceleration by Gravity
32
33			Throttle Acceleration per g		0.50
34
35			**Wheel Rates =	Spring Rate * (Motion Ration) 2
36
37			Wheel Rates
38			Front Wheel Rate	lb/in	259.92
39			Rear Wheel Rate	lb/in	336.96
40
41			** Load Transfer =	(Total Weight * Throttle Acceleration * CG Height) / (Wheelbase * g)
42
43			Load Transfer	lbs	328.29
44
45			** Front Axle Weight (After Load Transfer) =	Front Weight - Load Transfer
46			** Rear Axle Weight (After Load Transfer) =	Rear Weight + Load Transfer
47
48			Front Axle Weight	lbs	1734.21
49			Rear Axle Weight	lbs	2015.79
50
51	Problems
52
53	1
54		1.1	Front End Deflection Under Load
55
56			Front end deflection =	(Front Axle Weight *0.5) / Front Wheel Rate
57
58			Front End Deflection =	3.34	in
59
60		1.2	Rear End Deflection Under Load
61
62			Rear end deflection =	(Rear Axle Weight *0.5) / Rear Wheel Rate
63
64			Rear end deflection =	2.99	in
65
66		1.3	Pitch Angle
67
68			Pitch Angle =	tan -1 ((Front End Deflection + Rear End Deflection )/ Wheelbase )*(180/π)
69
70			Pitch Angle =	3.69	deg
71
72		1.4	Pitch Gradient
73
74			Pitch Gradient =	Pitach Angle / Throttle Acceleration per g
75
76			Pitch Gradient =	7.32	deg / g
77
78	2
79		2.1	Front Anti-Lift Angle
80
81			Front Anti-Lift Angle =	tan -1 ((FICV - Tire Radius )/ FICH )*(180/π)
82
83			Front Anti-Lift Angle =	3.45	deg
84
85		2.2	Rear Anti-Squat Angle
86
87			Rear Anti-Squat Angle =	tan -1 ((RICV - Tire Radius )/ RICH )*(180/π)
88
89			Rear Anti-Squat Angle =	6.04	deg
90
91		2.3	Front swing arm angle for 100% anti-lift
92
93			Swing arm angle =	tan -1 (CG Height/ Wheelbase )*(180/π)
94
95			Front swing arm angle for 100% anti-lift =	9.84	deg
96
97		2.4	Rear swing arm angle for 100% anti-lift
98
99			Rear swing arm angle for 100% anti-squat =	9.84	deg
100