FIALA Tire Property File
| Parameter | Details | Unit |
|---|---|---|
| unloaded_radius | Distance between the WC and the contact point of tire in unloaded conditions.
Used in computation of tire effective penetration. |
Length |
| width | Section width of the tire. Used in the calculation of aligning torque Tz for pure elastic deformation conditions. |
Length |
| aspect_ratio | Tire Sidewall profile aspect ratio. Describes the sidewall height as a
percentage of the tire section width. Not used in force calculation. |
- |
| vertical_stiffness | Vertical tire stiffness. Used in normal load calculation. |
Force/Length |
| vertical_damping | Vertical tire damping coefficient. Used in normal load calculation. |
Force*Time/Length |
| rolling_resistance | Used in rolling resistance moment calculation. This represents the shift in the longitudinal direction of the center of vertical load. | Length |
| cslip | Derivative of the longitudinal force with respect to the longitudinal slip in pure rolling conditions. | Force |
| calpha | Tire cornering stiffness. Derivative of the tire lateral force with respect to the slip angle (alpha) at zero lateral slip. | Force/Angle |
| cgamma | Not used in force calculation because FIALA does not consider the effects of the camber angle on the reaction forces. | Force/Angle |
| umin | Minimum friction coefficient. | - |
| umax | Maximum friction coefficient. | - |
| rlenx | Relaxation length in x direction, used in case of transient fiala. | Length |
| rleny | Relaxation length in y direction, used in case of transient fiala. | Length |
| rolling_radius_factor | For better estimation of force values. Rolling radius = loaded radius + ROLLING_RADIUS_FACTOR *(unloaded radius - loaded radius) |
- |
| Low_speed_threshold | The speed at which artificial damping starts to act. | Length/Time |
| damp_x | Numerical damping in x when the tire deformation in x goes out of bounds. | - |
| damp_y | Numerical damping in y when the tire deformation in y goes out of bounds. | - |