桥面跳车冲击过程下车-桥系统动力响应分析

Dynamic Response Analysis of Vehicle-bridge Systems under Vehicle’s Bumping Condition in Bridge Surface

为研究桥面跳车冲击作用下车-桥系统动力响应特征,以21自由度的4轴整车模型为研究对象,基于预设的障碍物几何模型,建立跳车过程下的车-桥耦合分析系统,并借助实际车辆跳车工况对所建立分析系统的适用性进行验证。结合有限元动力学分析方法,对跳车冲击过程中的车-桥系统力学性能进行分析。分析结果表明:所建立分析系统加速度分析结果与跳车试验测试结果吻合良好,所建立的跳车过程车-桥耦合分析系统具有良好的适用性;车辆驶过障碍物的过程中,车桥作用力最大波动值约为正常行驶的2.0倍,变化剧烈;跳车引起的驾驶不舒适体验与车速并非正相关,行车速度约为30 km/h跳车时的驾驶体验最差;各测点的动力响应在跳车时刻波动明显。

To investigate the dynamic response characteristics of vehicle-bridge systems under vehicle bumping in bridge surface,the 4-axle vehicle model with 21 DOFs were chosen as study subject.Based on the prepared geometrical model of an obstacle,a vehicle-bridge interaction analysis system was established,and its capability was verified through field measurement in bumping cases.By means of the finite element dynamic analysis method,the mechanical properties of the vehicle-bridge system under vehicle’s bumping was analyzed.It is shown that the acceleration analysis results of the established analysis system are in good agreement with the bumping test,and the established vehicle-bridge coupling analysis system under vehicle bumping in bridge surface has good applicability.In the process of vehicle driving through the obstacle,the maximum fluctuation value of vehicle-bridge interaction force is about 2.0 times of that of normal driving.The driving discomfort experience caused by bumping has no positive correlation with the vehicle speed.The driving experience is the worst at the speed of about 30 km/h.The dynamic response at the measurement points fluctuates obviously under vehicle bumping.