悬挂式单轨车桥耦合动力分析

Vehicle and bridge coupling dynamic analysis on suspension monorail

为研究悬挂式单轨运营过程中桥梁和车辆的动力响应变化规律,以某悬挂式单轨双线7跨30m简支梁方案为工程背景,运用通用有限元软件ANSYS建立桥梁有限元模型,分析桥梁的动力特性;然后在多体动力学软件SIMPACK中建立车桥耦合动力学模型,研究双线列车以运营速度对开通过桥梁时桥梁和车辆的动力响应,并分析轮胎刚度和列车编组对桥梁和列车动力性能的影响。分析结果表明:双线列车以65km/h的速度对开通过桥梁时,桥梁跨中的整体横向位移响应最大值为19.03mm,表明桥墩横向刚度较小;轮胎刚度对车桥系统的加速度响应有显著影响;3辆车编组过桥时,桥梁的竖向和横向响应值明显比1辆车编组大,因此,在车桥耦合动力仿真分析时,必须考虑列车编组对车桥系统动力响应的影响。

In order to study the dynamic response of bridges and vehicles during the operation on suspension monorail,a suspension monorail double track with 7 spans of 30m simply supported beam is used based on similar project case study,a bridge fi nite element model is established by using the general fi nite element software ANSYS to analyze the bridge dynamic characteristics.The vehicle and bridge coupling dynamic model is established in the multi-body dynamic software SIMPACK to study the dynamic response of the trains on the double track to the bridge and vehicle when it passes through the bridge at the operational speed,and the wheel tire stiffness and train consist to the bridge and train dynamics performance impact are analyzed.The results show that the maximum response value of the whole lateral displacement in the middle of the bridge span is 19.03 mm when two trains were meeting and passing the bridge girder at the speed of 65 km/h and it indicates that the lateral stiffness of the pier is small,so the wheel tire stiffness has a signifi cant impact on the acceleration response of the vehicle-bridge system.The vertical and lateral response values of the bridge are significantly bigger than that of the 1-car-consist when the 3-cars-consist train passing the bridge,therefore the impact of the train consist on the dynamic response of the vehicle-bridge system must be taken into consideration in the vehicle-bridge coupling dynamic simulation analysis.