Dynamic Theory And Simulation Research On Interaction Between Vehicle And Pavement

With the expanding numbers of vehicles, vehicle velocity and vehicle capacity,highway traffic pressure is on the increasing, which call for higher requirements of vehicle structure design. Comfort and security of vehicles and destruction of the road increasingly become focus problems. A period of time after putting into use, many roads are damaged in different degrees for reasons of pavement unevenness and vehicle vibration. What is more, vehicle vibration being aggravated by the destruction of pavement will cause more serious problems, which impact traffic safety and comfort. Therefore, the interaction between vehicles and the road is an indivisible whole system and studying the interaction between vehicles and pavement is important significance for theoretic analysis and engineering application.The main content of this paper is to study the dynamics for the system of the interaction between the vehicle and the pavement. Firstly, from the field of vehicle dynamics, considering the vibration of vehicle suspension system caused by the vehicle's own vibration and uneven pavement and vehicle-focused research object, the mechanics model of the interaction system for 1/4 two DOF vehicle and pavement based on Kelvin subgrade is built. Taking the road roughness as automotive systems incentives, the motion equations of the vehicle-road system is derived. by examples,influences of the parameters of vehicle suspension and tire and the parameters of road on the displacement and stress of the pavement is researched. Secondly, based on the road dynamics theory, the mechanics model for the dynamic response of viscoelastic pavement resting on the viscoelastically damped foundation pavement under a moving vehicle load is established. Based on the theories of viscoelasticity and Duhamel's integral theory, utilizing the integral transformation and Green's function, an analytical solution for the dynamic responses of viscoelastic pavement is presented,the influences of the road parameters on the pavement are analyzed by applying diagrams and examples, which is able to provide a theoretical reference for improving and optimizing the road system. Thirdly, the vehicle and road being coupled by the dynamic tire force, considering non-linear of vehicle suspension damping and stiffness of the tire and multi-layered pavements, the mechanics model for the dynamic response of a vehicle-road coupled system is built. Utilizing Galerkin method and mode superposition method, dynamic responses for the coupled system ofthe 1/2 four DOF nonlinear vehicle and road is presented. The nonlinear dynamic behaviors of the coupled system and influences of the parameters of the coupled system on the vehicle comfort and pavement damage are analyzed by applying numerical integration method, the reasonable Suggestions the parameters optimization of vehicle and road system are proposed by the analysis of the numerical results.Finally, based on the software of ADAMS and ANSYS, the simulation analysis for dynamic behaviors of the vehicle and road coupled system dynamic is presented and verifying the theoretical research results by the comparison.This thesis work will further enrich the study of the interaction mechanism between vehicle and pavement. It will also provide theoretical basis for the optimization design of vehicle safety and comfort and the structural optimization of the road. Research results show that it is important significance for theoretic analysis and engineering application.