随机不平度激励下车辆-沥青路面动力学响应分析

Obtaining the vehicle and asphalt pavement interaction characteristics under the excitation of random unevenness efficiently and accurately are necessary for road-friendly vehicle design and pavement performance evaluation. The analytical method and the solution idea of sequential decoupling are adopted. Firstly, the random dynamic load of the quarter vehicle model under random unevenness excitation is derived. Then, with the help of relative coordinate transform and Fourier integral transform, the analytical solution for the dynamic response of the viscoelastic multilayered asphalt pavement subjected to the random dynamic moving load is derived based on the wave propagation method, and the numerical program is compiled. Through analyzing the example of vehicle-pavement dynamic response, it can be found that the dynamic response amplitude of the asphalt pavement at each longitudinal position along the vehicle moving direction is related to the random dynamic load. Through the parameter analysis of vehicle-pavement system, it can be found that reducing the suspension and tire stiffness coefficients, or increasing the suspension damping coefficient can reduce the longitudinal strain at the bottom of the asphalt layer, which is beneficial to improve the pavement fatigue life; Tire damping coefficient has almost no effect on pavement dynamic response; The deterioration of pavement unevenness can significantly exacerbate pavement fatigue damage; Increasing the vehicle moving speed can reduce the average value of longitudinal strain at the bottom of the asphalt layer, but increase its variation coefficient, thus the effect of the vehicle moving speed on the average value and variation coefficient of the dynamic response should be comprehensively considered to evaluate the pavement fatigue life accurately.