Analytical Tire Forces and Moments Model With Validated Data 2007-01-0816
Tire models used in vehicle dynamics simulation and tire-related research rely basically on curve fitted experimental data and empirical adjustments of theoretical models. The complexity of tire mechanics has limited the development of a complete and reasonable analytical force theory. This paper validates an analytical tire model recently developed by the author. This theoretical model uses physical parameters: lateral and longitudinal stiffnesses, aligning moment pneumatic trail, overturning moment arm, lateral force relaxation length, and friction properties. These are standard mechanical properties that characterize the force generating capacity of tires. The validation procedure compares the theoretical ground forces and moments with experimental data. Tire data measured on a flat track tire testing machine are used in this validation. It covers the full range of longitudinal, lateral, and combined slips. This model can be applied in vehicle dynamics simulations up to extreme handling maneuvers and can be used to assess the effect of a specific tire's physical property on the performance of vehicle motion and stability. This validated analytical tire model is an important advancement in the field of tire force and moment predictions and puts more emphasis on the mechanics of contact rather than curve-fitting practices.