摘要
为研究车辆随机动载对半刚性沥青路面性能的影响,利用SIMPACK软件建立了重型载货汽车整车行驶动力学模型,提取了各轴车轮轮胎法向作用力。在此基础上建立了半刚性沥青路面三维有限元分析模型,分析了车辆随机动载作用下路面的动态响应。结果表明,随机动载作用下路面应力变化与车辆轴数有关,当三轴车辆车轮依次通过路面某一确定位置时,路面各层应力出现3次突变,最大应力出现在中、后轴车轮通过时;在车辆行驶区域,路面各点的最大拉、压应力均随车辆行驶距离和轮胎法向作用力不同而随机变化,轮迹中心线路面各点的垂直应力、水平应力、横向应力和水平剪应力变化频率与中、后轴轮胎法向作用力的变化频率相似,横向剪应力的变化频率与前轮的轮胎法向作用力变化频率相似,而轮迹边缘路面各点横向剪应力变化频率与中、后轮的轮胎法向作用力变化频率相似。
In order to study the influence of the random dynamic load of vehicles on the performance of half rigid asphalt road,the driving dynamic model of heavy truck was established by SIMPACK and each dynamic normal tyre force was extracted.A 3-D finite element analysis（FEA） model of half rigid asphalt road was established,and the dynamic responses of half rigid asphalt road under random dynamic load was analyzed.The results showed that the stress change of half rigid road was relative to the number of axles.When the wheels of a triaxial vehicle ran over the road in turn,the stress of each layer changed abruptly three times,and the maximal stress appeared when the middle axle and rear axle ran over.Within the vehicle driving region,the maximal press and tensile stress of each point on the pavement varied with the changes of driving distance and dynamic normal tyre force.The varied frequencies of the vertical stress,horizontal stress,transverse stress and horizontal shear stress of the points on the central line of the wheel track were similar to the varied frequency of the dynamic normal tyre force of middle and rear axles;and the varied frequency of transverse shearing stress were similar to the dynamic normal tyre force of front axle.However,the varied frequency of transverse shear stress of the points on the edge of wheel track was similar to the dynamic normal tyre force of middle and rear axles.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第2期28-33,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
教育部重点实验室开放基金资助项目(KF01-K200702)
山东省自然科学基金资助项目(ZR2009FM044)
关键词
车辆
路面不平度
随机动载
半刚性沥青路面
动态响应
Vehicle
Road roughness
Random dynamic load
Half rigid asphalt road
Dynamic response
