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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。
Urban rail transit brings convenience to people’s travel, but also brings some problems to people’s life. Aiming at the bridge structural noise caused by the urban rail transit overhead line during the running process of the vehicle, a two-lane single-chamber box girder is built on the basis of the track dynamics of the vehicle to establish a coupled model of the wheel-track-bridge dynamics. Of the vehicle running process, calculated under different structural boundary conditions of the bridge when the train passes the vibration. The acoustic-solid coupling model of the bridge is established. By comparing the acoustic pressure of the bridge structure under different structural boundary conditions, it is found that restraining the boundary of the bridge can reduce the structural noise of the bridge.