Urban rail transit improves people's life, but meanwhile brings some problems .Aiming at the problem of the bridge structure-born noise caused by the urban rail transit , the wheels -rail-bridge coupling system was built basing on vehicle -track dynamics theory , and then the vibration level of box girder with different boundary conditions could be achieved in the simulation model .On this foundation , the acoustical -structure coupling model was established .It is found that the constraint of bridge boundary can reduce the structure noise level by calculating the sound field of bridge structure noise under different boundary conditions .%城市轨道交通在给人们出行带来便捷的同时,也给人们的生活带来了一些问题.针对城市轨道交通高架线在车辆运行过程产生的桥梁结构噪声问题,在车辆轨道动力学基础上,以双线单室箱型梁为对象,建立车轮-轨道-桥梁动力学耦合模型,通过模拟真实的车辆运行过程,计算出不同结构边界条件下桥梁在列车经过时的振动情况.建立桥梁声-固耦合模型,通过对比不同结构边界条件下桥梁结构噪声的声场场点声压,发现对桥梁边界进行约束能够降低桥梁结构噪声.
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