高速列车作用下箱梁桥箱内振动噪声分布研究

Research on Distribution of Internal Vibration Noise of Box Girder Bridge under High-speed Train

为解决高速铁路线上箱梁桥日常检查与列车运营之间的冲突,探讨列车正常运行时箱梁内部噪声对日常检查工作造成的影响,桥梁结构振动辐射低频噪声会对检测人员造成极大危害,研究箱梁内部噪声分布有着重要的现实意义。结合车桥耦合振动和声传播理论,通过建立桥梁振动辐射有限元-边界元的求解体系,以78 m变截面混凝土箱梁桥作为实体模型,得出箱内瞬态噪声声场特性。分析结果表明,在车桥耦合振动所产生的箱内声辐射噪声分析中,变截面处声压值增大,且列车交汇产生的声压值大于单向行车产生的声压值。当箱内添加吸声材料后,可降低噪声水平,保障检测人员身体健康。

In order to solve the contradiction between the daily inspection of high-speed railway box girder bridge and train operation, this paper focuses on the impact of the internal noise on the daily inspection activities due to the bridge structure with low-frequency vibration radiation noise, which may cause great harm to the inspection people. Proper control of bridge internal noise distribution proves important practical significance. The transient noise induced by vehicle-bridge coupling vibration is investigated with a solving system based on FEM and BEM. A 78 m non-prismatic concrete box girder bridge is taken as the entity model to identify the transient noise characteristics of box girder bridge. The radiation noise analysis shows that sound pressure at non-prismatic section increases, meanwhile, the sound pressure produced where two trains are meeting is greater than that produced by train running in one direction. Adding sound-absorbing material can reduce noise level for the good of inspection people.