Study On Tire Cornering Property Under High Load Condition

The development of human society depends on the introduction of advancedimplements. Engineering vehicles, as a kind of advanced production tools, play anindispensable role in agricultural production, road construction, building construction,ore-transportation, fire control and other fields. Pneumatic tire of the engineering vehicle isthe only part that contacts with the ground. However, compared with the car tire, theengineering vehicle tire has larger geometry size, bigger inflation pressure, working undervery heavy load, the manufacturing cost is high. In terms of the tire test, most of the tire testrigs are only available for ordinary car tires and some SUV tires which are relatively small insize. And the test range of Test bench is limited by six component sensor range. To sum up,these factors lead to the lack of engineering tire test data, the engineering vehicle tiremechanical property research is not progressing perfect enough.If can use the test data originated from small load of the test rig to predict mechanicalproperties of engineering tire under large load. This will not only save the cost ofengineering tire test, but also will provide accurate high load tire model for commercialvehicle development.This paper based on all-terrain crane tire which is employed in the engineering vehicle.Unlike the bearing capacity of car tire and SUV tire, the crane tire is always working underthe vertical load of at least more than forty thousand Newton. The article is based on the ideaof "Theory-Forecast-Test", which includes four aspects: building cornering property model,virtual test with finite element model, establishment of a predictable mode and crane tire testunder high load condition.First of all, the paper starts from studying the mechanical properties of tire under thepure cornering condition. After taking all the main influence factors into consideration, avery precise theoretical model under pure cornering condition is developed. The theoreticalmodel expresses tyre mechanical characteristics on the macro and provided theoretical guidance for semi-empirical modeling.In the modeling process of theoretical model, the effect of vertical load is not carefullyconsidered. It is necessary to consider the influence of vertical load on tire modelcharacteristic during building the load forecasting model. The half length of the tiregrounding mark is the key factor in establishing the model. It varies with load and affects thechanging trend of cornering stiffness and aligning stiffness. In this paper, the finite elementmodel is introduced to analyze the static and dynamic characteristic of the tire, the groundingmark and cornering property. This will not only provides test data under different load, butalso will promote the development of the tire finite element model.The cornering stiffness, aligning stiffness, tire friction characteristics are studied and thecorresponding expression is presented. After implanting expressions containing load variableinto the UniTire tire model, a load prediction model based on the theory of UniTire model isformed. Compared with the theoretical model, semi-empirical model has more advantages intire characteristics parameter identification. From the result analysis, the predictable modelhas a high accuracy and powerful prediction ability. It has a very high guiding significance inengineering practice.Tire test rig is an indispensable tool in the research of mechanical properties. In ordernot to be confined by six component sensor range, the improved six degrees of freedom tiretest rig is applied to complete the engineering tire cornering condition test.