Description: Computes the lateral velocity at points both in front of and behind the vehicle. From these lateral velocities, the sideslip angle is calculated at a given point in the body. This routine is useful in validating a model against actual vehicle test data which employed Q-heads for sideslip measurements. The lateral velocity at each Q-head location is calculated with and without the effects of roll oscillations. The sideslip is calculated at a MARKER position provided in the call statement. The sideslip is also calculated with and without the effects of roll oscillations.
Input:
REQ/id, FUNCTION = USER (1116,fhm,rhm,grnd,cgm,scale )
where:
| | Description |
|---|
fhm | = | MARKER id of front Q-head (fixed to the sprung mass) |
rhm | = | MARKER id of rear Q-head (fixed to the sprung mass) |
grnd | = | MARKER id of a point on the ground in global reference frame orientation |
cgm | = | MARKER id of a point on the sprung mass where the sideslip angle is to be calculated. |
scale | = | scale factor to be multiplied to the front and rear Q-head lateral velocities (i.e. scale = 1.0 implies mm/sec and scale = 2.237E-3 provides mph) |
Request File Output
Column Number Output:
1. Scaled front Q-head lateral velocity including the effects of roll oscillations
2. Scaled front Q-head actual lateral velocity
3. Scaled rear Q-head lateral velocity including the effects of roll oscillations
4. Scaled rear Q-head actual lateral velocity
5. Sideslip angle at designated MARKER calculated (deg) with the roll oscillations present
6. Sideslip angle at designated MARKER calculated with (deg) actual Q-head lateral velocity
Notes on Input and Output
This routine is useful in correlating Adams model simulation results to actual vehicle test data for a given maneuver. It is important, however, to place the front and rear Q-head MARKERs at the exact location the real Q-heads were mounted on the test vehicle. The MARKERs must also be on the sprung mass. Also, the MARKER on the sprung mass where the sideslip is to be calculated must have the same initial orientation as the global reference frame.