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Tire Property File Parameters |
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Tire Property File Parameters |
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The second set of inputs is obtained by reading the property file associated with each FIALA tire. These parameters are read during initialization and are converted appropriately to the model units based on the [UNIT] data block defined in the tire file. A description of the parameters is provided below:
Name |
Description |
Units |
|---|---|---|
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/non-dimensional slip ratio |
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. |
N/A |
UMax |
Maximum friction coefficient |
N/A |
The parameters not used in the force calculation, like CGamma or Aspect Ratio, are not required and can be omitted from the tire file. All the other parameters are expected and the simulation will be halted if they are not defined in the tire property file.
