Fiala

Fiala tire model used to determine the forces and moments developed at the tire contact patch

The Fiala tire model, introduced by E. Fiala and extended by the developers of MSC Adams, computes expressions for all tire forces and moments except for the overturning moment. The effects of inclination angle on tire forces are not included, nor are the effects of comprehensive slip during combined cornering, braking, and traction (that is, the lateral and longitudinal slip are treated independently). The Fiala tire model provides reasonable results for many maneuvers.

Note: The $\mathrm{hubFrame}$ port of the Fiala tire model must be connected directly to the $\mathrm{hubFrame}$ port of a tire body component, as shown in the diagram below.

Connections

 Name Description Color $\mathrm{hubFrame}$ Tire reference frame, which must be connected to a tire body component Gray

Parameters

 Symbol Default Units Description ID ${C}_{\mathrm{rr}}$ .01 - Rolling resistance moment coefficient Crr ${C}_{\mathrm{long}}$ 115000 $N$ Longitudinal force coefficient Clong ${C}_{\mathrm{lat}}$ 117000 $N$ Lateral force coefficient Clat ${\mathrm{μ}}_{1}$ .2 - Static coefficient of friction mu1 ${\mathrm{μ}}_{2}$ .75 - Dynamic coefficient of friction mu2 $\mathrm{r2}$ .16 $m$ One half the tire width r2

References

 1 E. Fiala, "Seitenkraefte am Rollenden Luftreifen", VDI Zeitschrift, vol.96, 1954.