Adams Car Package > Adams Car > Appendix > Special Requests > Dual Ball Rack Travel and Steering System Geometry Angles

Dual Ball Rack Travel and Steering System Geometry Angles

This routine computes the rack travel, steer arm lengths, toe angles, and toggle angles of a suspension with two lower ball joints.
Input:
REQ/id, FUNCTION = USER (1128,m3id,m4id,m6aid,m6bid,m7id,m10id,m9id,m11id,m12id,m14id, mg14id)
where:
 
 
Description
m3id
=
id of MARKER at point 3 (front LCA pivot)
m4id
=
id of MARKER at point 4 (rear LCA pivot)
m6aid
=
id of MARKER at point 40 (front lower ball joint)
m6bid
=
id of MARKER at point 6 (rear lower ball joint)
mw7id
=
id of MARKER at point 7 (upper ball joint) on spindle
ms10id
=
id of MARKER at point 10 (tire contact patch) on spindle
m9id
=
id of MARKER at point 09 (wheel center) on spindle
m11id
=
id of MARKER at point 11 (spindle alignment point)
m12id
=
id of MARKER at point 12 (outer tie rod ball)
m14id
=
id of MARKER at point 14 (inner tie rod ball) on vehicle
mg14id
=
id of MARKER at point 14 (inner tie rod ball) on the ground
Request File Output
Column Number Output:
1. Rack travel (mm)
2. Negative rack travel (mm)
3. Steering arm length (mm)
4. Wheel toe angle (deg)
5. Toggle angle (deg)
6. (not used)
Notes on Input and Output
This request can only be accessed for half or quarter vehicle suspension models. Also note that this REQUEST has the following sign convention:
Positive Toe : Toe in
Positive Camber : Top of tire out