Computes the longitudinal and lateral accelerations at the accelerometer location, including the error caused by gravity due to roll and pitch of the vehicle. Also returns the steering ratio which is user-supplied, and calculates the wheelbase of the vehicle.
Input:
REQ/id, FUNCTION = USER (1121,accm,ibdy,mscale,strat,lfwc,rfwc,lrwc,rrwc )
where:
| | Description |
|---|
accm | = | accelerometer MARKER id |
ibdy | = | body cm MARKER id |
scale | = | scale factor to be multiplied to the longitudinal and lateral accelerations (i.e. scale = 1.0 implies mm/sec**2 and scale = 1.0197E-4 provides g) |
strat | = | steering ratio |
lfwc | = | left front wheel center MARKER id |
rfwc | = | right front wheel center MARKER id |
lrwc | = | left rear wheel center MARKER id |
rrwc | = | right rear wheel center MARKER id |
Request File Output
Column Number Output:
1. Longitudinal acceleration measured with the accelerometer
2. Lateral acceleration measured with the accelerometer
3. Steering ratio (* to 1)
4. Averaged wheelbase length (mm)
5. (not used)
6. (not used)
Notes on Input and Output
The Z axis of the wheel center MARKER must be perpendicular to the wheel plane and must point away from the body centerline. The accelerometer MARKER is on the body and has the same initial orientation as the global reference frame.
The sign convention is:
Positive Longitudinal Acceleration = Forward
Positive Lateral Acceleration = Driver-side