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Modelling and analysis of suspension systems 245
Locate C
A
B
I
{R CB } 1
{R CI } 1
{R CA } C
1
Data required
{R A } 1 {R B } 1 {R I } 1
|R CA | |R CB | |R CI |
Locate D
A
B
C
{R DB } 1
D
Data required
{R A } 1 {R B } 1 {R C} 1
|R DA | |R DB | |R DC |
{R DA } 1
Locate G
D
F
{R DC} 1
{R GD} 1
{R GF } 1
Data required
{R D } 1 {R E } 1 {R F } 1
|R GD | |R GE | |R GF |
E
{R GE } 1
G
Locate H
J
D
{R HJ } 1
{R HG} 1
{R HD} 1
H
Data required
{R D} 1 {R G} 1 {R J } 1
|R HD | |R HG | |R HJ |
G
Locate P
D
H
Data required
{R D} 1 {R G} 1 {R H} 1
{R PD} 1
{R PH} 1
|R PD | |R PG | |R PH |
G
{R PG} 1
P
Fig. 4.81
Calculation sequence to solve double wishbone suspension geometry
The length between each of the three reference points and the movable point
must also be fixed and known. This will only work if the movable point lies
on the same rigid body as each of the reference points.
In addition to locating the movable points just described we will also need
to determine the new positions K and L of the two points located on the
wheel spin axis as shown in Figure 4.82. These two positions will be used
with the starting locations K and L to determine the change in steer and
camber angle between the two suspension configurations.
Having followed the process outlined here we obtain the new positions
shown in Table 4.15. The results obtained using vector theory are compared