Tire Optimization Study Based On Vehicle Minimum Time Handling And Stability

Vehicle minimum time handling and stability reflect the handling and stability at high speed and it is closely related to driving safety.Tire is the only part connecting the car with the ground.It is of great significance to study the influence of the tire for minimum time handling and stability.However,in the aspect of handling and stability,the study of tire and vehicle is usually separated,and there is a lack of optimization for tire design parameters according to vehicle characteristics.In order to achieve the tire design parameters optimization based on vehicle minimum time handling and stability,the finite element model of 205/55R16 passenger car radial tire with complex tread pattern was established in ABAQUS,finite element tire was analysis,the tire model was verified by grounding mark and radial stiffness simulation results,the tire longitudinal-slip and cornering characteristics data was calculated in different load and camber angle by steady state transport technology.According to the data of finite element analysis,based on improved particle swarm optimization,the two-stage identification of tire model parameters was carried out in MATLAB.The tire finite element model was transformed into PAC89(Pacejka ’89Tyremodel)tire model which was used to simulate the handling stability under steady condition.PSO combined with the two-stage identification method got the identification results quickly and accurately.The identification converges with lees than 50 iterations,and the goodness of fit R-squre was greater than 0.94.Seven subsystem modules were built in ADAMS,and the whole vehicle model was obtained through assembly.PAC89 tire model was applied in the vehicle model,and the doublelane change simulation test combined with the evaluation index of minimum time handling and stability was carried out.Tire belt Angle,belt width,inflation pressure and tread rubber elasticity as optimization variables,the evaluation index of comprehensive vehicle minimum time handling and stability as optimization target,according to the test design scheme for 28 times simulation analysis,the second order response surface model was established and solved,and the tire design parameters were optimized.After optimization,the evaluation index of driver heavy decreased by 31.12%,the evaluation index of roll angle by decreased 6.58%,the evaluation index of sideslip risk decreased by 7.03%,the evaluation index of camber decreased by 5.32%,and the evaluation index of comprehensive vehicle minimum time handling and stability decreased by 9.94%,from3.149 to 2.836,indicated that the vehicle minimum time handling and stability was improved.