噪声与振动控制2016，Vol.36Issue(5)：112-116,5.DOI:10.3969/j.issn.1006-1335.2016.05.024
共振速度下轨道交通槽形梁结构瞬态噪声分析
Transient Noise Analysis of Rail Transit Trough-shaped Beam Structures under Resonant Speeds
摘要
Abstract
In order to further study the structural noise of bridges under different train speed condition, the structural noise and sound radiation characteristics of a rail-transit trough-shaped 30 m-span simply-supported beam are analyzed by means of finite element method and transient boundary element theory. First of all, the finite element and boundary element model of the trough-shaped beam is established. Then, vibration of the simply supported beam under moving load excitation is analyzed, and the resonance speed and the vibration suppression speed are obtained. Finally, using the theory of sound radiation combined with the transient boundary element method, the characteristics of the transient noise of the beam induced by different train speeds are calculated and analyzed. The results show that the train-speed change can cause fluctuation of the displacement amplitude of the beam structure. The vibration acceleration of the beam structure increases with the increasing of the train speed. Variation of the radiation noise of the beam structure is somewhat correlated with that of the structure vibration acceleration. When the train is traveling through the beam bridge at the resonance speed, the dynamic response and the radiation noise of the structure will be obviously amplified. The transient noise of the beam bridge structure is also significant under resonant speed in the far acoustic field. So, the train speed should be controlled in order to reduce the noise of the beam bridge structure.关键词
振动与波/槽形梁/移动荷载/共振/消振/瞬态声辐射特性Key words
vibration and wave/trough-shaped beam/moving load/resonance/vibration suppression/transient sound radiation characteristic分类
交通工程引用本文复制引用
刘林芽,曾峰,姚忠達,许代言..共振速度下轨道交通槽形梁结构瞬态噪声分析[J].噪声与振动控制,2016,36(5):112-116,5.基金项目
国家自然科学基金资助项目（51268014）、(51578238)；江西省“赣鄱英才555工程”领军人才培养计划项目 （51578238）
