Simulation Study Of Tire Braking Performance On Wet Roads

Tire is one of the most important parts that affect the dynamic characteristics of the vehicle,and its grip performance is the most important factor to determine the safety of the vehicle.Especially in poor condition attached to the rainfall and snow weather when the vehicle braking performance is mainly composed of a tire holding characteristic shows,if no effective contact of tire and road surface,will not produce the longitudinal force,lateral force and aligning torque,the vehicle will not to accelerating,braking or turning.Therefore,it is of great significance to study the grip characteristics of tires on rainy days,and to optimize the performance of wet-road braking performance.As a simulation method,the theory and technology of finite element method(FEM)has become more and more mature,and has been successfully applied to the study on tire noise,temperature field and wear.It is difficult to simulate the coupling effect between the tire and the road surface water.Therefore,the finite element method is an effective way to replace the experimental study of the tire.Based on the ABAQUS software,the coupling set up 5 different tread patterns 205/55 R16 tire flow model by J.R.Cho et al "brake equivalent discrete finite element method as the basis,and ABS control of steady state tire hydroplaning braking simulation,combined with the vehicle parameters,calculated the braking time and distance.The main work of this paper can be summarized as follows:1.Establish a high precision tire finite element model.The mesh by using HYPERMESH software,and mechanical test and Yeoh constitutive model,ABAQUS model,tire test machine based on tire mechanics research Chittagong chamber were various conditions of static,steady and transient high frequency test,simulation and finite element model results were compared to verify the full results,in this paper according to the tire model has high accuracy,combined with the dynamic friction coefficient subroutine based on the development of the FORTRAN can be applied to the analysis of tire simulation under various complex condition.2.Fluid solid coupling modeling and analysis.A tire-water coupling model by CEL method,the analysis of water skiing.Tire holding test should be used in wetland test equipment,this paper due to the lack of test data,summarizes and analyzes the theoretical model and empirical model of existing,water skiing speed limit was verified,the results show that the proof of the fluid solid coupling model is effective and reliable,high precision.At the same time,the simulation analysis of the impact of load,water depth and running pattern and other design parameters on tire hydroplaning performance.3.Based on the brake J.R.Cho establishment of discrete simulation method,simulation of the rain water road braking performance of tire;principle based on multivariate linear regression analysis,the water depth,load and tire pressure,tire and transverse and longitudinal grooves width of these 6 variables,the establishment of uniform design test,simulation each level of combination scheme,obtained through the analysis of water surface tire braking distance regression prediction model,and verified the regression model.The results show that the parameters such as the depth of the pavement,the load,the tread rubber and the structure of the tread have a significant influence on the braking distance,and there is a linear relationship.The braking distance prediction model can largely save the test cost and shorten the product development cycle.