Adams Assignments – Problem 4 – Steering geometry 2
Models : Front SLA (created from Acar library)
Aim:
Perform kingpin geometry optimization to achieve the following targets
1.Caster angle : ~4.00 deg
2.Caster moment arm : ~21.00 mm
3.KPI angle : ~13.00 deg
4.Steer axis offset (resultant) : ~85.00 mm
5.Steer axis longitudinal offset : ~0.00 mm
6.Scrub radius : ~20.00 mm
Hard-point table before modification:
Hard-point table after modification:
Caster Angle:
Caster Moment Arm:
KPI Angle:
Steer axis offset (resultant):
Steer axis longitudinal offset:
Scrub radius:
Comparision Table:
| Parameters | Harpoint influence | Default | Target | Achieved | Units |
| Caster angle | LCA & UCA Outer ball joints | 5 | 4 | 4.06 | deg |
| Caster moment arm | LCA & UCA Outer ball joints | 8.5 | 21 | 20 | mm |
| KPI angle | LCA & UCA Outer ball joints | 10.13 | 13 | 13.9 | deg |
| Steer axis offset (resultant) | LCA & UCA Outer ball joints,wheel centre | 85 | 85 | 85.3 | mm |
| Steer axis longitudinal offset | LCA & UCA Outer ball joints,wheel centre | 18 | 0 | -1 | mm |
| Scrub radius | LCA & UCA Outer ball joints | 33 | 20 | 20.9 | mm |
Also, explain whether all of these parameters can be controlled independently
Nope!, it is not possible to control the suspension parameters Independently, each parameter is dependent on one another.
Eg: Change in LCA ball joints will affect the Caster as well as Scrub and KPI.