Study On The Interaction Between Vehicle And Road System

Dynamic vehicle-roads interaction is a new scientific branch. It deals with three main parts: vehicle, road, and dynamic problem of their interactions. Of the three parts, the study on the last one is still weak. Although many specialist and scholars have developed deep study on separate field of vehicle or road, the work is still less on the interactions between vehicle and road as a whole, especially on vehicle dynamic load and road dynamic response influenced by the change of vehicle parameters.In order to make up the lack on the study of vehicle-road interaction, we do much work and made some results. The subject includes the following.The study on vehicle dynamic load model. The vertical force applied to the road surface by vehicle can be separated into two components: the static load and fluctuating component known as dynamic tire force. It is very important for vehicle-roads interactions study to deeply analyze the regular of the load. During the study, some vehicle models of passive suspension are formed, and the following researches are based on them. Optimization of suspension can reduce vehicle dynamic load and improve the life of road, so we introduce the semi-active suspension. By changing the output equation and target function of control system, we can establish many semi-active suspension vehicle models. From simulating results, we can conclude that semi-active can apparently reduce the dynamic load by vehicle.2 ~. The study on dynamic load influenced by the changing of parameter. We have theoretical foundation to analyze dynamic tire load with model, so we can further analyze the influence of parameter to dynamic load. Only on the basis of reasonable knowing of those can we provide some valuable advice to pavement engineers.3. The study on analyses method of road response by vehicle dynamic load. It is another important part of the vehicle-roads interaction to analyze road response by dynamic load. We do much work to make up the lack of study on response of the Multi-layered Pavement System under the dynamic load. During the study, we introduce a new method named the Changeable Static Load Method to analyze road response under moving vehicle, and finally solve the problem with FEM.4.. Study on developing model of road performance. Deflection is one of the most important performances of flexibility road. Because of complexity of flexible road construction, road design life based on experiential formula or theoretical formula of current deflection computing theory has errors from reality, especially it does not reflect influence of dynamic tire load. So we establish more reasonable developing model of deflection with neural networks model, which input node include dynamic vehicle load. From the simulating result, neural networks model is suitable to describe the deflection performance.Rut has become one of the most important performances with the increasing of traffic on flexible road. To reflect this, a rut developing model, which is based on viscous-elastic theory and consider dynamic vehicle load, is founded. From simulating result, the model can better explain the regular of prophase and metaphase of rut developing.5. Experiment study. Although experiment takes an important role in the filed of vehicle-roads interactions, it still weak. During the study, we design a experiment equipment based on the characteristic of dynamic tire load and appraise goal, and finally realize experiment analyzing of dynamic tire load.26 The study on software system of vehicle-road interaction. Software system takes important role in the field of vehicle-road interaction. Better and intelligent software can not only quicken our analyses on system, but also deepen our comprehension to vehicle-road interaction. Chapter 5 establishes a friendly and easily extensible software system based on OOA and Visual C-H- platform, and realizes the intelligent analyses of vehicle-road interaction.