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基于功能化虚拟样机和有限元技术,提出一种精确车辆动态载荷作用下半刚性沥青路面响应的分析方法,可实现轮胎动、静载荷在半刚性沥青路面上的精确加载,从而准确预测路面疲劳寿命。基于车辆动力学原理,在ADAMS平台构建重型货车-路面高精度虚拟样机模型,通过实车平顺性实验验证其正确性;在B级路面输入下,通过仿真获得各轴动载荷变化规律;基于弹性层状体系理论构建半刚性沥青路面的3-D粘弹性有限元模型,在同时考虑车辆载荷动态性、移动性及轮胎矩形印迹的基础上,分别分析单、双轮载荷作用下的路面响应。仿真表明水平应力的交变变化是半刚性沥青路面破坏的主要因素,而且所研究重型货车的后轴双轮造成的路面疲劳断裂破坏比前轴单轮增加了192%。
Based on the functionalized virtual prototyping and finite element technology, a precise and accurate method for analyzing the response of semi-rigid asphalt pavement under dynamic load is proposed to accurately predict the fatigue of pavement on the semi-rigid asphalt pavement. life. Based on the principle of vehicle dynamics, a heavy truck-pavement high-precision virtual prototype model was constructed on the ADAMS platform, and the correctness of the simulation was verified by real ride comfort test. Under the input of class B pavement, the variation of dynamic load of each axle was obtained by simulation. Based on the layered system theory, a 3-D viscoelastic finite element model of semi-rigid asphalt pavement was established. Pavement response under single-and double-wheel load was analyzed based on vehicle dynamics, mobility and tire rectangular footprint. The simulation shows that the alternation of horizontal stress is the main factor of semi-rigid asphalt pavement failure, and the fatigue failure of pavement caused by double wheels of the rear axle of the truck under study is increased by 192% compared with that of the front axle.