不同跨径的轨道交通槽形梁声振特性分析
Analysis of structural vibration and noise characteristics of rail transit trough girders with different span

为研究不同跨径的轨道交通槽形梁结构振动与噪声的特性，基于车辆-轨道耦合动力学模型，利用有限元和边界元法分析跨径对槽形梁结构声振特性的影响。研究结果表明：随着桥梁跨径的增大，槽形梁的横向和竖向自振频率都会减小；不同跨径的槽形梁结构振动与噪声的峰值频率都在63 Hz附近；最后分析得出跨度为27 m的轨道交通槽形梁的声学性能最好，这为轨道交通槽形梁的减振降噪设计提供一定的理论参考。
In order to study the vibration and noise characteristics of the rail transit trough girder with different span, based on vehicle-track coupling dynamics model, the influence of the span on the acoustic and vibration characteristics of the rail transit trough girder is analyzed by using the finite element method and the boundary element method. The results show that the transverse and vertical natural frequencies of the rail transit trough girder will decrease with the increase of the span of the bridge. The peak frequencies of vibration and noise of the trough girder with different span are about 63 Hz. The acoustic performance of the rail transit trough girder with the span of 27 m is the best, which provides a theoretical reference for the design of the vibration and noise reduction of the rail transit trough girder