Theoretical Research On Coupling Vibration Of Vehicle-road System Under The Excitation Of The Stochastic Road Roughness

Heavy traffic has a significantly destructive action to pavement, and it often causesan early and complex damage failure mode. The nature between vehicle and road is aprocess of vehicle-road dynamic interaction. Especially, with the increase of vehiclespeed and vehicle load, or when vehicle quality and the effective vibration mass ofpavement structure are on the same magnitude, the coupling dynamic action betweenvehicle and road may be significant. But this aspect has been seldom investigated, andthe mechanism of vehicle-road coupling dynamic action remains to be revealed.Therefore, the plane and space theoretical model of vehicle-road coupling vibrationboth were researched and established, and the solving method is proposed. Based onestablished models, the mechanism of vehicle-road coupling dynamic action underthe excitation of the stochastic road roughness was researched and analyzed. Themain work and conclusions are as follows:1. Establishion and authentication for the plane theoretical model of biaxialvehicle-road coupling vibration. The plane theoretical model of biaxial truck-road andWalking Beam-road coupling vibration with their dynamic equilibrium equationswere established, and the solutions were obtained. Meanwhile, the simulationprograms were compiled, and the theoretical verification of their simulation resultswas carried out. The results shows that the results of the Dynamic Load Coefficientand the dynamic displacement of the pavement are in good agreement with theanalytical solutions.2. Based on the plane theoretical model, the vehicle-road coupling action on thevehicle dynamic load was investigated, and the vehicle dynamic load for differentroad grade, vehicle speed, and vehicle parameters are calculated and analyzed. Theanalysis shows that, for the selected calculation parameters, the influencing effect ofthe vehicle-road coupling action to the vehicle dynamic load weakens with increasingthe flexural rigidity parameter of pavement, foundation stiffness parameter, and road grade, and the foundation damping parameter has little effect on it. Meanwhile, thevehicle-road coupling effect will be significant when the flexural rigidity parameter ofpavement and the foundational response modulus both reduce to a certain extent. Andthere exists an speed scope of vehicle which can make the influencing effect of thevehicle-road coupling action to the vehicle dynamic load to be near zero. In addition,the influence of pavement structure parameters on the spectrum of vehicle dynamicload is very small.3. Establishion and authentication for the space theoretical model of biaxialvehicle-road coupling vibration. The vehicle was simplified as the whole vehiclemodel, and the pavement was regarded as a thin plate above the viscoelasticfoundation, then the space theoretical model of biaxial vehicle-road couplingvibration was established, and its corresponding simulation programs was compiled.The theoretical verification of the simulation results was also carried out. The resultsshows that, the results of the Dynamic Load Coefficient are in good agreement withthe analytical solutions.4. Based on the established space theoretical model, the vehicle-road couplingaction on the vehicle dynamic load was furtherly investigated, and the influence ofwhether considering the vehicle roll motion or not on the dynamic load for differentroad grade, vehicle speed, vehicle parameters and pavement structural parameterswere calculated and analyzed. The analysis shows that, for the selected calculationparameters, the influencing effect of the vehicle-road coupling action to the vehicledynamic load weakens with increasing the concrete rigidity parameter of pavementand the vehicle speed, and it weakens with decreasing the vehicle weighing. The otherinfluence laws of pavement structure parameters on the vehicle dynamic load isbasically identical with the result of the plane theoretical model of vehicle-roadcoupling vibration.5. Comparison and Analysis for numerical results and the measured data of thedynamic response of the pavement were carried out. The analysis shows that theresults of the plane and space theoretical model of vehicle-road coupling vibrationboth are in good agreement with the measured data on the regularity. So, thenorrectness of two types of models and their simulation programs are verified.