Study Of Tire’s Camber And Lateral Mechanics Properties Under Extreme Conditions

The tire’s camber mechanical property is an important part of the vehicledynamics study. After years of hard work, the domestic and foreign academics haveestablished the camber mechanical property models for tire, including theoreticalmodels, semi-empirical models and empirical models. However, these models didless research on the mechanical properties of tire’s camber and lateral mechanicsproperties under extreme conditions, which would lead to a certain deviationbetween actual and simulation value in terms of this condition. After the experimentof tire’s camber and lateral mechanics properties under extreme condition and therelated results analysis. In addition, a corresponding UniTire steady state model hasbeen built and refined. The thesis is divided into five chapters.Chapter One is the introduction part of this paper, which introduces the researchbackground and significance, the classification and characteristic of the mechanicalproperties for the tire. And the main content of this study is presented.Chapter Two test the tire camber and lateral mechanical properties in steady state.At each lateral angle the plate is moved back and forth two times. The test gets thecurve of the lateral force and cornering torque at different load and camber angle,analysis shows that with the increase of camber angle, tire cornering stiffnessdecreases, and under the small camber angle and plus or minus lataral angle, thecorning torque becomes the opposite, when under the relatively large camber angleand plus or minus lateral angle, the direction of the corning torque is same. Theimpact of camber angle on tire lateral mechanical property is directional, when thecamber angle and side-slip angle are of opposite sign, lateral force is suppressed, andcornering torque is promoted. When the camber and lateral angle are of same sign, lateral force is promoted, and cornering torque is suppressed. From the curve of thetire steady state lateral force and corning torque and side-slip angle, it is concludedthat at the same camber angle, with the increase of load, tire cornering stiffness alsogradually increases, which lays a solid foundation for modeling work.Chapter Three tire is simplified to tread brush model, the tire force is obtainedin the analysis of the tread geometric deformation under camber or not, theimprinting is sectionally solved according to the slide-starting point, which isobtained in the imprinting, then establish the tire steady state camber and lateralbrush model, obtain the theoretical boundary conditions of the tire steady stateproperty considering the impact of camber, modify the lateral force curvature factorof UniTire steady state model. The research shows the impact of camber on side-slipproperty is directional, camber influence the rate of change of cornering torque in thetransition phase, then modify the pneumatic trail peak factor and pneumatic trailcurvature factor.Chapter Four uses the method of combination of experiment and theoreticalanalysis, study the impact of camber on lateral friction coefficient and corneringstiffness, establish the semi-empirical model; And experimental verification isapplied to UniTire steady state model considering camber influnce.Chapter Five is the conclusion of the paper, it summarizes the full text andpoints out the future research direction.