侧向风作用下车-桥系统的气动特性——移动车辆模型风洞试验系统

为考虑侧向风作用下车辆运动对车-桥系统气动特性的影响,针对车-桥系统气动绕流的特点,研制了一套移动车辆模型风洞试验系统,在风洞中实现了侧向风作用下车辆运动过程中桥梁和车辆各自气动力的同步测试.该系统可以较方便地改变来流风速、车辆运动速度、测试对象以及车辆与桥梁的相对位置等.根据测试信号时程的特点,提出了相应的数据处理方法,分析了车辆运动过程中桥梁和车辆动态气动力的变化特征.试验结果表明,桥梁和车辆的气动力信号较稳定,试验结果比较可靠.

Aerodynamic Characteristics of Vehicle-Bridge System under Cross Wind:Wind Tunnel Test System with Moving Vehicle Model

In order to consider the effects of vehicle motion on the aerodynamic characteristics of a vehicle-bridge system,a new test system with a moving vehicle model was developed regarding to the aerodynamic characteristics of ambient flow around the vehicle-bridge system to realize the synchronous measurement of the aerodynamic forces on bridge deck and vehicles in a large wind tunnel when a train is running through the bridge deck under cross wind.In the wind tunnel test system,wind velocity,vehicle velocity,test objects and relative position of vehicle and bridge are easy to change.Based on the characteristics of time-history of testing signals,a data processing method was presented,and changes in the dynamic aerodynamic force signals of bridge and moving vehicle were analyzed.The wind tunnel test results indicate that the aerodynamic force signals of both bridge deck and vehicle are relatively stable,and the test results are relatively reliable.