车辆动载对路面的永久变形损伤评价

Evaluation of road permanent deformation damage due to vehicle dynamic load

不平整路面能够引起较大动荷载,动荷载的激励又使路面不平度增加,该互相促进过程使得路面破坏在不断加大,因此研究车辆动载对路面的损伤具有重要意义。永久变形作为路面的主要病害,对路面不平度和行车舒适性有较大影响。文章用自回归(auto regressive,AR)模型模拟路面随机激励的时域模型,并应用在建立的1/2车辆模型中,求解汽车在不平整路面的振动响应量;根据"四次方定律"提出了车辆动载对路面永久变形损伤的评价指标,并在不同路面等级、不同车速等情况下研究车辆动载对路面永久变形损伤情况。

The rough pavement can impose dynamic load, and the impact of dynamic load can increase the roughness of pavement surface, this mutual promotion progress increases the road damage contin- uously, so the study of the damage caused by vehicle dynamic load is of significance. As the main damage of pavement, permanent deformation has larger influence on the road roughness and riding comfort. In this paper, auto regressive（AR） model is used to simulate the random road excitation in time-domain, and it is applied to the half-vehicle model for solving the vibration responses of vehicles on the rough pavement. Based on the fourth power theory, a new evaluation index of road permanent deformation damage due to the vehicle dynamic load is put forward, and this evaluation index is used to study the damage condition at different highway levels and speeds of vehicle.