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Tire Force and Moment Reporting

From A/Chassis, I am referring Req/1051~43 for Tire Force & Moment data from vehicle data set. When I checked these Lateral Forces at 4 corners during a constant radius, they were shown as sine-wave-like oscillation around zero-value with a sizeable magnitude equivalent to a given slip angles.  (same for Fx, except values for z-axis) I believe this is caused from these F&M values are being reported with a global reference marker... not a vehicle-fixed marker like a CG.  Any thought on this? And what to do if F&M data is wanted to be reported in vehicle orientation? (No source code of Req/Subroutine is open to public.)      
Parents
  • I have checked "REQ/1150, USER(20,...)" request routine, and find that the forces and torques are calculated at the wheel center with respect to a coordinate system whose Z axis is aligned with GlobalZ, and X and Y are shadow vector of spindle axes on the road. This routine only reads and returns results from the Tire output array, so my guess is that the coordinate system selection is hard coded somewhere in ATire solver. I will contact our tire developer to see if there is a workaround for this.
     
    Regards,
    Yuan
Reply
  • I have checked "REQ/1150, USER(20,...)" request routine, and find that the forces and torques are calculated at the wheel center with respect to a coordinate system whose Z axis is aligned with GlobalZ, and X and Y are shadow vector of spindle axes on the road. This routine only reads and returns results from the Tire output array, so my guess is that the coordinate system selection is hard coded somewhere in ATire solver. I will contact our tire developer to see if there is a workaround for this.
     
    Regards,
    Yuan
Children
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