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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.)

0 Yuan.Lyu over 8 years ago

Hi,

Could you please provide the REQ and user routine number in the ADM file? I could help you to check the routine source.

Regards,

Yuan
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0 slee over 8 years ago

They are REQ/1050 ~1053 under 'user defined' group as LR/RR/LF/RF Tire Force.

When these F&M is plotted by the '(dynamic) constant radius' event, they are seen as oscillating about their neutral positions corresponding to vehicle position in on a circle, esp Lateral Force. This may have not been obvious in other events.
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0 Yuan.Lyu over 8 years ago

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
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0 Micha over 8 years ago

Slee (BTW: would be nice to know where you are and whom you are working for): ever thought about using FTire? It gives you tire/forces and moments both in contact patch and spindle (no, they are *not* the same) in nearly every coordinate system you might think about.
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0 slee over 8 years ago

Thanks Micha for your input. I am aware of FTire. When needed, it will be considered.
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