Study On The Coupling Effect Between Tires And Soft Ground And Optimization Of Tread

When wheeled vehicles are driven on soft ground,tires are embedded and popped in the soil,and the coupling relationship between tires and ground not only affects the sink deformation of the soil under the vehicle load,but also has an important impact on the off-road passability and maneuverability of the vehicle.The study of the coupling relationship between tires and ground and the analysis of the change law of the adhesion characteristics between tires and ground can provide the theoretical basis and technical support for the research of off-road passability and maneuverability of wheeled vehicles and the design and development of wheeled vehicles.This paper adopts a combination of theoretical derivation and simulation analysis to study the mechanical mechanism of vehicle-ground coupling,constructs a soil dynamic load-bearing model containing loading rate,water content,loading times and other nonconstant factors,analyzes the mechanism of coupling between tires and soft ground,explores the influencing factors and change laws of tire-ground adhesion characteristics,and builds a mathematical model of tire-ground adhesion characteristics,and the specific The research contents include:(1)Studied the mechanical mechanism of the coupling between tires and ground,analyzed the Moorcullen damage criterion of soil,and explored the Bekker bearing model and Janosi shear model of soil;(2)Combined with the experimental data of soil bearing and shear,we analyzed the changes of soil bearing characteristics with loading rate,water content and loading times,and constructed a theoretical model of soil dynamic bearing;based on the soil dynamic bearing model and the calculation formula of tire ground adhesion,we constructed a mathematical model of tire ground adhesion characteristics including loading rate,water content,repeated loading times and other non-constant coefficients;(3)The finite element simulation model of tire ground dynamic coupling was constructed,and the variation law of tire ground adhesion characteristics with water content was analyzed,and the simulation analysis results were compared with the calculation results of the theoretical model of tire ground adhesion characteristics to verify the rationality of the mathematical model of tire ground adhesion characteristics;(4)Based on the optimization design theory,the influence law of tread pattern on tire ground coupling relationship is studied,and the maximum adhesion force between tire ground is the optimization target,three common tire tread patterns are analyzed and compared,and the optimal scheme of tread pattern is determined.The paper constructs a dynamic soil bearing model containing loading rate,moisture content,repeated loading times and other non-constant factors,on which a mathematical model of tire ground adhesion characteristics based on dynamic coupling is proposed,and the rationality of the theoretical model is tested through simulation analysis,which provides an important theoretical basis and technical support for the study of off-road passability and maneuverability of wheeled vehicles and the optimization and upgrading of wheeled off-road vehicles It provides an important theoretical basis and technical support for the study of off-road vehicle performance,mobility and optimization of wheeled off-road vehicles.