| The tractor tire,as the tractor directly contact with the soil,bears the load,driving force and steering force of the tractor and transmits it to the soil.The interaction between the tractor tire and the soil directly affects the tractor’s tractability.Therefore,it is very important to analyze the interaction between tire and soil to study the traction performance of tractor.This paper takes the high power wheel tractor 11.2-24 8PR tire as the research object,the steady rolling process of tire contact with soil are simulated,and design structures,soil bin test rig for tire traction performance test,the tire traction and tire subsidence quantity as evaluation index,for different pavement influence factors of tire traction performance for the following research.(1)Theoretical analysis and soil test.The interaction force between tractor tire and soil was analyzed,and the physical and mechanical properties of soil were tested on loam and sandy loam.The mechanical composition,wet bulk density,moisture content,cone index,soil cohesion and internal friction Angle were obtained.(2)Establish the interaction model between tire and soil.According to the tire geometric characteristics and material characteristics,determine the tire rubber material constitutive model and material parameters,completed the tire finite element model,tire inflation simulation,simulation results and experimental values and national standard allowable value,verified the validity of the tire finite element model.The soil constitutive model was selected according to the characteristics of soil structure,and the finite element model parameters of loam,sandy loam and concrete were set and meshes were divided.The contact characteristics of tire and different soil were analyzed,and the interaction simulation model of tire and soil was established.(3)Tire traction performance simulation.The steady-state rolling traction performance simulation of tires on soft farmland road surface and concrete road surface was carried out in ANSYS Workbench software,and the tire traction force and tire settlement amount under different load,slip rate,tire pressure,pattern density and other influencing factors were obtained.The results show that the tire tractive force and tire settlement increase with the increase of vertical load on soft farmland road surface and rigid concrete road surface.With the increase of slip rate,tire traction and tire settlement on different soil surfaces increased significantly at first and then slowed down.However,when the slip rate of tire on loam,sandy loam and concrete surfaces reached 20%,25% and 15% respectively,the increase trend of tire traction turned.On different road surfaces,the tire traction force and tire settlement decrease with the increase of tire pressure.With the increase of pattern density,soft soil road tire traction and tire subsidence volume increase after first reduced,rigid concrete pavement tire traction and tire subsidence amount showed a trend of increase,in the loam,silty loam and concrete pavement,and reaches the best traction corresponding tire pattern logarithmic respectively is 15,15 and 18.(4)Tire traction performance soil groove tests were carried out.The indoor soil tank test rig was designed and built and combined with the simulation conditions to carry out the tire traction performance soil tank test,to obtained the tires on the farmland soil and concrete pavement affected by load,the slippage rate and the tire pressure change in tire traction performance test results,and compared with the results of simulation,the results showed that the trend of test results and simulation results,experiments and simulation error values are less than 10%,of the finite element method to verify the effectiveness of high-power tractor tire traction performance. |
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