Research And Application Of Tire Flexible Ring Model

The tire is a composite rubber structure.The driving performance of a car depends largely on the mechanical and structural characteristics of the tire.Tire vibration analysis is a hot issue generally concerned by the tire manufacturing industry and the automobile manufacturing industry.The study of tire dynamic characteristics parameters is of great significance for vehicle vibration reduction,noise reduction,and improvement of vehicle motion characteristics.In this paper,an improved tire flexible ring model is proposed,and the tire modal frequency under different dynamic conditions is predicted and analyzed.In this paper,the radial excitation-response experimental modal analysis is performed on the radial tire,and the modal frequency,modal vibration mode and damping ratio of the radial tire are accurately extracted.The tires in the no-load state and the loaded state were tested separately,and the low-order modal parameters were extracted,which provided a reliable basis for tire modeling.An optimized flexible ring tire model is proposed.The structural parameters of the model include tire geometric parameters,stiffness coefficients of radial and tangential springs in the model.The low-order frequency obtained by the tire modal test is used as a known condition.The modal frequency equation is solved to obtain the spring stiffness coefficient.The correctness of the solution of the spring stiffness coefficient is verified by comparing the natural frequency test with the analytical value of the modal frequency.The experimental methods of rubber viscoelasticity and superelasticity were studied,and the experimental data of mechanical properties were accurately extracted.Based on the theoretical analysis of rubber superelastic and viscoelastic mechanical characteristic constitutive models,ABAQUS was used to fit the hyperelastic and viscoelastic test curves and obtain the rubber mechanical characteristic constitutive model parameters.Obtained the hyperelastic Yeoh model C10,C20,C30 and viscoelastic generalized Maxwell modelg_i~p,?_i~p parameters,which laid the foundation for the establishment of tire finite element model and simulation verification.In this paper,an improved tire flexible ring model is established using ABAQUS finite element software.The modal frequency and modal shape of the model under no-load and loaded conditions are obtained from simulation experiments,and the modal obtained from the experimental modal analysis is obtained.The comparison of the mode shape and the frequency shows a high degree of consistency,which verifies the accuracy of the model established in this paper.In this paper,the improved tire flexible ring model is used to predict and analyze the tire modal frequency under different dynamic conditions.When the tire pressure and speed are constant,and the vehicle load is between 1000N and 5000N,the greater the vehicle load,the natural frequencies of each order will gradually increase.When the load and speed are fixed,and the tire tire pressure changes in the range of 1.6Mpa-3.2Mpa,the lower the tire pressure,the higher the modal frequency.When the tire pressure and load are constant,the vehicle speed increases from 20km/h to 120km/h.The higher the vehicle speed,the lower the natural frequency of each order will be smaller,and the frequency is closer to the static load mode in value.