Computes the toe, caster, and camber of a front or rear suspension.
Input:
Option A:
REQ/id, FUNCTION=USER (1101,lkim,lkam,lwcm,rkim,rkam,rwcm,brm,stflg,refm)
where:
| | Description |
|---|
lkim | = | left kingpin intersection MARKER id |
lkam | = | left kingpin axis MARKER id |
lwcm | = | left wheel center MARKER id |
rkim | = | right kingpin intersection MARKER id |
rkam | = | right kingpin axis MARKER id |
rwcm | = | right wheel center MARKER |
brm | = | body reference MARKER (body center-of-mass MARKER) |
stflg | = | (optional, default flag = 0)
flag = 0 steered axle so caster is computed
flag = 1 non-steered axle so caster is not computed |
refm | = | (optional, default marker id = 3)
Reference MARKER id |
Option B:
REQ/id, FUNCTION = USER (1101,0.0,lkam,lwcm,0.0,rkam,rwcm,brm,stflg,refm)
where:
| | Description |
|---|
lkam | = | left kingpin axis MARKER id |
lwcm | = | left wheel center MARKER id |
rkam | = | right kingpin axis MARKER id |
rwcm | = | right wheel center MARKER id |
brm | = | body reference MARKER id |
stflg | = | (optional, default flag = 0)
flag = 0 steered axle so caster is computed
flag = 1 non-steered axle so caster is not computed |
refm | = | (optional, default marker id = 3)
Reference MARKER id (typically ground MARKER) |
Request File Output
Column Number Output:
1. Toe angle of left wheel (deg)
2. Caster angle of left wheel (deg)
3. Camber angle of left wheel (deg)
4. Toe angle of right wheel (deg)
5. Caster angle of right wheel (deg)
6. Camber angle of right wheel (deg)
Notes on Input and Output
Two options are available for input. Output is the same regardless of which input option is used. Input option A uses three MARKERs per side to determine the kingpin axis and the spindle axis. Option B uses two MARKERs per side to determine the kingpin and spindle axis.
For option A the spindle axis is defined by a line from the kingpin intersection MARKER to the wheel center MARKER. Similarly, the kingpin axis is defined by a line from the kingpin intersection MARKER to the kingpin axis MARKER. The kingpin axis MARKER must be above the kingpin intersection MARKER. All three MARKERs are on the knuckle. Orientation of the MARKERs does not affect the output.
For option B the spindle axis and kingpin axis are defined by the Z axes of the wheel center MARKER and kingpin axis MARKER respectfully. The Z axis of the wheel center MARKER must be perpendicular to the wheel plane and must point away from the body centerline. The Z axis of kingpin axis MARKERs must be parallel to the kingpin axis and point upward away from ground. Both MARKERs are on the knuckle. The body reference MARKER is on the body and has the same initial orientation as the global reference frame.
The sign convention is:
Positive toe: Toe in
Positive Camber: Top of tire out