Tire test for drifting dynamics of a scaled vehicle
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Abstract
Drifting is a cornering technique with large angle of sideslip. In some special conditions, however more advantageous it is, drifting is high risk to loss of control. Due to difficulties and perils of drifting, the study of drifting dynamic on scaled vehicle test is more preferable. Because of the large amount of tire slip while drifting, tire forces cannot be linearly estimated with the tire cornering stiffness. In this study, scaled vehicle’s tire forces occurring at high slip condition were studied by means of a drum tire test. The drum tire tester was designed and developed to control the slip conditions, consisting of slip angle and slip ratio, and to measure the tire friction forces consistent with each slip condition. While testing, the slip angle was determined by the steering angle of the tested wheel and the slip ratio was controlled by the rotational speeds of drum and the wheel. Despite small unbalances of drum and wheel, vertical load was controlled by the use of counter weight. The tire friction forces, both lateral and longitudinal, were measured by the ATI Gamma force sensor. Eventually, the experimental data was used to fit parameters of Magic Formula tire friction model. The obtainable tire friction model can be applied to estimate the tire forces of scaled vehicle at high slip drifting condition.
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